On 2 Nov, 09:52, "Bill Buckels" <bbuck...@mts.net> wrote:
> "Toinet" <antoine.vig...@laposte.net> wrote: > >Will your board allow sound input as well as sound output? I mean > >"numérisation du son" (sound digitization)
> Hi Tony,
> That would be good if Drew's board provided recording as well as playback > functionality. (i.e. ADC input as well as DAC output).
> Bill
Hi,
At the moment it will be output only. I have thought about input, and i 'might' look at this at a later date. This is all new to me and am keen to get something produced and then look at how i can improve things maybe on a version 2.0 board, but to be honest if i was going to do the input i would need lots of help from the group :).
To: Drew Re: Re: Apple IIGS Stereo Sound Card - Interest? By: Drew to comp.sys.apple2 on Mon Nov 02 2009 02:49 am
> to do the input i would need lots of help from the group :).
Drew, is this project a "more the merrier" or do you want to keep it on CSA2 only for now? If you were considering putting these together, and making a little $$$ for your trouble, I can put something on A2C but it might mean a lot more interest than you're ready for. <shrug> You're blog has been in our recommended blog list for several weeks so maybe it won't matter.
On 2 Nov, 14:25, "sfahey" <sfa...@a2central.com.remove-4rb-this> wrote:
> To: Drew > Re: Re: Apple IIGS Stereo Sound Card - Interest? > By: Drew to comp.sys.apple2 on Mon Nov 02 2009 02:49 am
> > to do the input i would need lots of help from the group :).
> Drew, is this project a "more the merrier" or do you want to keep it on CSA2 > only for now? If you were considering putting these together, and making a > little $$$ for your trouble, I can put something on A2C but it might mean a lot > more interest than you're ready for. <shrug> You're blog has been in our > recommended blog list for several weeks so maybe it won't matter.
Well at the moment, best to keep it just to CSA2 until i have prototype board done. Once i really know the effort to put these together happy for the world to know lol. Thanks for putting me on the recommend blog list :)...btw its Drewbie GS ;)....not the greatest name i know lol
To: Drew Re: Re: Apple IIGS Stereo Sound Card - Interest? By: Drew to comp.sys.apple2 on Mon Nov 02 2009 06:56 am
> recommend blog list :)...btw its Drewbie GS ;)....not the greatest > name i know lol
Doh! OK, I've changed it. I usually put people's real names with their blogs so they are credited. I won't post anything until you're ready and want me to.
Drew wrote: > On 2 Nov, 09:52, "Bill Buckels" <bbuck...@mts.net> wrote: >> "Toinet" <antoine.vig...@laposte.net> wrote: >>> Will your board allow sound input as well as sound output? I mean >>> "numérisation du son" (sound digitization) >> Hi Tony,
>> That would be good if Drew's board provided recording as well as playback >> functionality. (i.e. ADC input as well as DAC output).
>> Bill
> Hi,
> At the moment it will be output only. I have thought about input, and > i 'might' look at this at a later date. This is all new to me and am > keen to get something produced and then look at how i can improve > things maybe on a version 2.0 board, but to be honest if i was going > to do the input i would need lots of help from the group :).
Since the Ensoniq ADC input (mono) is on the same connector as the multiplexed outputs, you already have access to the input.
All that's needed is suitable amplification for your intended input (required for a microphone input) plus an anti-aliasing low-pass filter--probably another two op-amps as active filters.
The net impact to the bill of materials would be another two or three op-amps (in one chip), about a dozen passives (resistors and capacitors), and an input jack--plus a gain control if one is not available off-card.
If a low-level (microphone) input is provided, some care should be exercised in laying out the card to avoid noise pickup.
> Drew wrote: > > On 2 Nov, 09:52, "Bill Buckels" <bbuck...@mts.net> wrote: > >> "Toinet" <antoine.vig...@laposte.net> wrote: > >>> Will your board allow sound input as well as sound output? I mean > >>> "numérisation du son" (sound digitization) > >> Hi Tony,
> >> That would be good if Drew's board provided recording as well as playback > >> functionality. (i.e. ADC input as well as DAC output).
> >> Bill
> > Hi,
> > At the moment it will be output only. I have thought about input, and > > i 'might' look at this at a later date. This is all new to me and am > > keen to get something produced and then look at how i can improve > > things maybe on a version 2.0 board, but to be honest if i was going > > to do the input i would need lots of help from the group :).
> Since the Ensoniq ADC input (mono) is on the same connector as the > multiplexed outputs, you already have access to the input.
> All that's needed is suitable amplification for your intended input > (required for a microphone input) plus an anti-aliasing low-pass > filter--probably another two op-amps as active filters.
> The net impact to the bill of materials would be another two > or three op-amps (in one chip), about a dozen passives (resistors > and capacitors), and an input jack--plus a gain control if one is > not available off-card.
> If a low-level (microphone) input is provided, some care should > be exercised in laying out the card to avoid noise pickup.
> "The wastebasket is our most important design > tool--and it's seriously underused."
Hi,
I have completed the prototype card (http://drewbiegs.blogspot.com), but seems the hiss that was on the breadboard is on the real card as well, specifically on the right speaker. I was wondering if anyone had some suggestions on a good starting point? possibly the layout of the board, but I am not expert on what can cause issues with audio on PCB...
Nice looking card! The fabricator has done a great job on the matt green.
As for noise, I usually find power is a key contributor for noise. Some low noise linear regulators (10uV/RMS) with high PSRR can really make a difference, especially if you have stage gains around 20db and above. Its amazing how much supply noise gets amplified up into the output. Killing it at the source is easier than removing it from the output.
Do you know for sure its white noise? (hiss) - is there any sign of digital noise? When the floppy drive operates, do you notice any change in the noise level for example?
steve
On Nov 24, 8:20 am, Drew <goggled...@gmail.com> wrote:
> On 2 Nov, 17:34, "Michael J. Mahon" <mjma...@aol.com> wrote:
> > Drew wrote: > > > On 2 Nov, 09:52, "Bill Buckels" <bbuck...@mts.net> wrote: > > >> "Toinet" <antoine.vig...@laposte.net> wrote: > > >>> Will your board allow sound input as well as sound output? I mean > > >>> "numérisation du son" (sound digitization) > > >> Hi Tony,
> > >> That would be good if Drew's board provided recording as well as playback > > >> functionality. (i.e. ADC input as well as DAC output).
> > >> Bill
> > > Hi,
> > > At the moment it will be output only. I have thought about input, and > > > i 'might' look at this at a later date. This is all new to me and am > > > keen to get something produced and then look at how i can improve > > > things maybe on a version 2.0 board, but to be honest if i was going > > > to do the input i would need lots of help from the group :).
> > Since the Ensoniq ADC input (mono) is on the same connector as the > > multiplexed outputs, you already have access to the input.
> > All that's needed is suitable amplification for your intended input > > (required for a microphone input) plus an anti-aliasing low-pass > > filter--probably another two op-amps as active filters.
> > The net impact to the bill of materials would be another two > > or three op-amps (in one chip), about a dozen passives (resistors > > and capacitors), and an input jack--plus a gain control if one is > > not available off-card.
> > If a low-level (microphone) input is provided, some care should > > be exercised in laying out the card to avoid noise pickup.
> > "The wastebasket is our most important design > > tool--and it's seriously underused."
> Hi,
> I have completed the prototype card (http://drewbiegs.blogspot.com), > but seems the hiss that was on the breadboard is on the real card as > well, specifically on the right speaker. I was wondering if anyone had > some suggestions on a good starting point? possibly the layout of the > board, but I am not expert on what can cause issues with audio on > PCB...
> On 2 Nov, 17:34, "Michael J. Mahon" <mjma...@aol.com> wrote:
> > Drew wrote: > > > On 2 Nov, 09:52, "Bill Buckels" <bbuck...@mts.net> wrote: > > >> "Toinet" <antoine.vig...@laposte.net> wrote: > > >>> Will your board allow sound input as well as sound output? I mean > > >>> "numérisation du son" (sound digitization) > > >> Hi Tony,
> > >> That would be good if Drew's board provided recording as well as playback > > >> functionality. (i.e. ADC input as well as DAC output).
> > >> Bill
> > > Hi,
> > > At the moment it will be output only. I have thought about input, and > > > i 'might' look at this at a later date. This is all new to me and am > > > keen to get something produced and then look at how i can improve > > > things maybe on a version 2.0 board, but to be honest if i was going > > > to do the input i would need lots of help from the group :).
> > Since the Ensoniq ADC input (mono) is on the same connector as the > > multiplexed outputs, you already have access to the input.
> > All that's needed is suitable amplification for your intended input > > (required for a microphone input) plus an anti-aliasing low-pass > > filter--probably another two op-amps as active filters.
> > The net impact to the bill of materials would be another two > > or three op-amps (in one chip), about a dozen passives (resistors > > and capacitors), and an input jack--plus a gain control if one is > > not available off-card.
> > If a low-level (microphone) input is provided, some care should > > be exercised in laying out the card to avoid noise pickup.
> > "The wastebasket is our most important design > > tool--and it's seriously underused."
> Hi,
> I have completed the prototype card (http://drewbiegs.blogspot.com), > but seems the hiss that was on the breadboard is on the real card as > well, specifically on the right speaker. I was wondering if anyone had > some suggestions on a good starting point? possibly the layout of the > board, but I am not expert on what can cause issues with audio on > PCB...
> Any help would be appreciated :)
> Drew
Good job Drew, Keep up the good work. I have no HW skills, I let others help you. antoine
> Nice looking card! The fabricator has done a great job on the matt > green.
Thanks :-), shame it didn't work properly first go :(, but all part of the fun :-)
> As for noise, I usually find power is a key contributor for noise. > Some low noise linear regulators (10uV/RMS) with high PSRR can really > make a difference, especially if you have stage gains around 20db and > above. Its amazing how much supply noise gets amplified up into the > output. Killing it at the source is easier than removing it from the > output
Do you add the linear regs to the board itself ?
> Do you know for sure its white noise? (hiss) - is there any sign of > digital noise? When the floppy drive operates, do you notice any > change in the noise level for example?
Tonight I am going to connect a floppy drive and see if that adds noise, and also switch the outputs of left and right from the MC1402B chip to see if the white noise follows. If it does then at least i can eliminate half the circuit i.e the TL084 Amp part. I still have the bread board made up, so at least i have something to play with still.
Also going to run through the circuit to see if i can see any obvious issues.
>>Nice looking card! The fabricator has done a great job on the matt >>green.
> Thanks :-), shame it didn't work properly first go :(, but all part of > the fun :-)
>>As for noise, I usually find power is a key contributor for noise. >>Some low noise linear regulators (10uV/RMS) with high PSRR can really >>make a difference, especially if you have stage gains around 20db and >>above. Its amazing how much supply noise gets amplified up into the >>output. Killing it at the source is easier than removing it from the >>output
Amen.
> Do you add the linear regs to the board itself ?
Right. You can regulate +12 down to, say, +9 (and -12 down to -9 if you need a negative supply, too).
I fully agree with Steve. For the AppleCrate II audio mixer, I actually double-regulated +12 down to +5 for the audio stages, and it eliminated the rampant digital "hash" on the Apple power.
>>Do you know for sure its white noise? (hiss) - is there any sign of >>digital noise? When the floppy drive operates, do you notice any >>change in the noise level for example?
> Tonight I am going to connect a floppy drive and see if that adds > noise, and also switch the outputs of left and right from the MC1402B > chip to see if the white noise follows. If it does then at least i can > eliminate half the circuit i.e the TL084 Amp part. I still have the > bread board made up, so at least i have something to play with still.
Good plan! Stereo circuits really help with substitution. ;-)
> Also going to run through the circuit to see if i can see any obvious > issues.
A good indicator that the noise is coming in on the power rails is to bridge a large electrolytic from the supply rail to ground (or both if bipolar) very near the audio stages. If you hear a significant reduction in noise, the power is likely the problem and regulating down is a good fix.
Another possibility is high frequency oscillation. High-speed opamps can be unstable if they are not properly bypassed and compensated. This can be a little trickier to find without an oscilloscope. A low-pass filter will help here (as would slower opamps ;-). Also note that an electrolytic bypass does not replace a ceramic 0.1uF bypass at high frequencies--use both.
BTW, you need a low-pass to eliminate any frequencies above half the sampling frequency, since they are noise. (My ears have enough mileage on them that they low-pass everything, but your's are probably in better shape. ;-)
In addition to an opamp buffer stage, a two-pole active low-pass filter (plus a single RC pole) will help clean things up.
> >>Nice looking card! The fabricator has done a great job on the matt > >>green.
> > Thanks :-), shame it didn't work properly first go :(, but all part of > > the fun :-)
> >>As for noise, I usually find power is a key contributor for noise. > >>Some low noise linear regulators (10uV/RMS) with high PSRR can really > >>make a difference, especially if you have stage gains around 20db and > >>above. Its amazing how much supply noise gets amplified up into the > >>output. Killing it at the source is easier than removing it from the > >>output
> Amen.
> > Do you add the linear regs to the board itself ?
> Right. You can regulate +12 down to, say, +9 (and -12 down to -9 > if you need a negative supply, too).
> I fully agree with Steve. For the AppleCrate II audio mixer, I > actually double-regulated +12 down to +5 for the audio stages, > and it eliminated the rampant digital "hash" on the Apple power.
> >>Do you know for sure its white noise? (hiss) - is there any sign of > >>digital noise? When the floppy drive operates, do you notice any > >>change in the noise level for example?
> > Tonight I am going to connect a floppy drive and see if that adds > > noise, and also switch the outputs of left and right from the MC1402B > > chip to see if the white noise follows. If it does then at least i can > > eliminate half the circuit i.e the TL084 Amp part. I still have the > > bread board made up, so at least i have something to play with still.
> Good plan! Stereo circuits really help with substitution. ;-)
> > Also going to run through the circuit to see if i can see any obvious > > issues.
> A good indicator that the noise is coming in on the power rails > is to bridge a large electrolytic from the supply rail to ground > (or both if bipolar) very near the audio stages. If you hear a > significant reduction in noise, the power is likely the problem > and regulating down is a good fix.
> Another possibility is high frequency oscillation. High-speed > opamps can be unstable if they are not properly bypassed and > compensated. This can be a little trickier to find without an > oscilloscope. A low-pass filter will help here (as would slower > opamps ;-). Also note that an electrolytic bypass does not replace > a ceramic 0.1uF bypass at high frequencies--use both.
> BTW, you need a low-pass to eliminate any frequencies above > half the sampling frequency, since they are noise. (My ears > have enough mileage on them that they low-pass everything, but > your's are probably in better shape. ;-)
> In addition to an opamp buffer stage, a two-pole active low-pass > filter (plus a single RC pole) will help clean things up.
I was looking at another example Stereo card that was published in a french magasine, and interestingly their design places an OP-Amp (LM318) between J25-3 (waveOut) and the MC1402B and a SN7407 hex buffer between J25-4/6 and the MC1402B IC...sounds like they did this to clean up the signle before being split out.
On 24 Nov, 14:22, Drew <goggled...@gmail.com> wrote:
> I was looking at another example Stereo card that was published in a > french magasine, and interestingly their design places an OP-Amp > (LM318) between J25-3 (waveOut) and the MC1402B and a SN7407 hex > buffer between J25-4/6 and the MC1402B IC...sounds like they did this > to clean up the signle before being split out.
> Drew
Hi, me again :)
Right i attached a floppy drive and using the drive whilst listening to sound didn't make any difference to the white noise. I switched round the output from the MC1402B (demux) and the white noise shifted from right to left. This i would say eliminates the OpAmp TL084 imo.
I am at the moment just attaching a standard pair of headphones to test with as don't actually have any powered speakers and the line in to my pc doesnt seem to want to work lol (headphones work fine on iphone...so don't suspect the headphones). I do have another pair of better headphones that have a volume control and it would seem that they don't have the white noise, well it doesn't seem so obvious.
Is it possible that though the card is outputting whitenoise that certain speakers/headphones will take out the white noise?
Drew wrote: > On 24 Nov, 14:22, Drew <goggled...@gmail.com> wrote:
>>I was looking at another example Stereo card that was published in a >>french magasine, and interestingly their design places an OP-Amp >>(LM318) between J25-3 (waveOut) and the MC1402B and a SN7407 hex >>buffer between J25-4/6 and the MC1402B IC...sounds like they did this >>to clean up the signle before being split out.
Any noise on the +5 supplying the Ensoniq DOC chip will show up in the analog output. Presumeably, the ROM 3 audio cleanup addressed this issue. After the noise is injected, you won't be able to clean up the part that falls within the audio band, so you can't do better than the DOC output.
Using an opamp to buffer the DOC analog output prior to demuxing in the 14052 shouldn't be necessary, and may introduce crosstalk if the opamp bandwidth is limited.
Similarly, the TTL control signal does not need buffering. Seems like the French design is a bit over-engineered. ;-)
The 14052 analog switch should not couple power supply noise into its outputs, so you're good there.
The opamp circuits are also quite good at rejecting power supply noise (though bypassing is always good), so I don't expect that to be a problem.
If you were generating the analog inputs on the board, then power supply noise would be a major factor, but the analog signals are generated by the DOC, over which you have no control.
> Hi, me again :)
> Right i attached a floppy drive and using the drive whilst listening > to sound didn't make any difference to the white noise. I switched > round the output from the MC1402B (demux) and the white noise shifted > from right to left. This i would say eliminates the OpAmp TL084 imo.
> I am at the moment just attaching a standard pair of headphones to > test with as don't actually have any powered speakers and the line in > to my pc doesnt seem to want to work lol (headphones work fine on > iphone...so don't suspect the headphones). I do have another pair of > better headphones that have a volume control and it would seem that > they don't have the white noise, well it doesn't seem so obvious.
Is it just because they are lower volume. or is there a real difference in just the noise level.
This circuit is not designed to drive headphones of any kind--only line-level inputs, so that is how you should be doing all your testing. Old amplified stereo speakers are about $5 at most thrift stores, and will work fine for testing.
> Is it possible that though the card is outputting whitenoise that > certain speakers/headphones will take out the white noise?
It is possible that the headphones are causing the driving opamp to oscillate, and that is showing up as increased noise.
(BTW, after looking at your circuit, I see that you already have a 2-pole active low-pass filter--the first op amp in each channel, so don't worry about my previous low-pass comments.)
I expect that everything is going to work fine as soon as you connect the board to line-level inputs.
> >>I was looking at another example Stereo card that was published in a > >>french magasine, and interestingly their design places an OP-Amp > >>(LM318) between J25-3 (waveOut) and the MC1402B and a SN7407 hex > >>buffer between J25-4/6 and the MC1402B IC...sounds like they did this > >>to clean up the signle before being split out.
> Any noise on the +5 supplying the Ensoniq DOC chip will show up in > the analog output. Presumeably, the ROM 3 audio cleanup addressed > this issue. After the noise is injected, you won't be able to clean > up the part that falls within the audio band, so you can't do better > than the DOC output.
> Using an opamp to buffer the DOC analog output prior to demuxing > in the 14052 shouldn't be necessary, and may introduce crosstalk > if the opamp bandwidth is limited.
> Similarly, the TTL control signal does not need buffering. Seems > like the French design is a bit over-engineered. ;-)
> The 14052 analog switch should not couple power supply noise into > its outputs, so you're good there.
> The opamp circuits are also quite good at rejecting power supply > noise (though bypassing is always good), so I don't expect that > to be a problem.
> If you were generating the analog inputs on the board, then power > supply noise would be a major factor, but the analog signals are > generated by the DOC, over which you have no control.
> > Hi, me again :)
> > Right i attached a floppy drive and using the drive whilst listening > > to sound didn't make any difference to the white noise. I switched > > round the output from the MC1402B (demux) and the white noise shifted > > from right to left. This i would say eliminates the OpAmp TL084 imo.
> > I am at the moment just attaching a standard pair of headphones to > > test with as don't actually have any powered speakers and the line in > > to my pc doesnt seem to want to work lol (headphones work fine on > > iphone...so don't suspect the headphones). I do have another pair of > > better headphones that have a volume control and it would seem that > > they don't have the white noise, well it doesn't seem so obvious.
> Is it just because they are lower volume. or is there a real > difference in just the noise level.
> This circuit is not designed to drive headphones of any kind--only > line-level inputs, so that is how you should be doing all your > testing. Old amplified stereo speakers are about $5 at most thrift > stores, and will work fine for testing.
> > Is it possible that though the card is outputting whitenoise that > > certain speakers/headphones will take out the white noise?
> It is possible that the headphones are causing the driving opamp to > oscillate, and that is showing up as increased noise.
> (BTW, after looking at your circuit, I see that you already have > a 2-pole active low-pass filter--the first op amp in each channel, > so don't worry about my previous low-pass comments.)
> I expect that everything is going to work fine as soon as you > connect the board to line-level inputs.
> "The wastebasket is our most important design > tool--and it's seriously underused."
Hi Michael,
Again thanks for your help :). I just bought a pair of powered speakers from local supermarket and sounds much better, so much so that i don't think there is a problem. In fact there is less white noise than on my audio animator...which i was surprised to see..or hear rather.
I think the headphones as you said were causing increased noise.
I think the problem is that i am a bit of a perfectionist and also didn't want people buying the cards to be disappointed.
I would like to make a review board up with one of the remaining cards (have some things to sort out first though for connectors and it wont have a back plate at this point) and possible get it sent to someone to play/test with and give me their opinion and possible compare it to other cards to see if all is as it should be. If anyone is interested in doing this drop me a message. I would like the card back, but if you like it i am sure we can negotiate on the cost if you want to keep the card (and I will send back plate once i complete them...though assuming i don't get distracted with integrating a digitiser to it...lol)
> > >>I was looking at another example Stereo card that was published in a > > >>french magasine, and interestingly their design places an OP-Amp > > >>(LM318) between J25-3 (waveOut) and the MC1402B and a SN7407 hex > > >>buffer between J25-4/6 and the MC1402B IC...sounds like they did this > > >>to clean up the signle before being split out.
> > Any noise on the +5 supplying the Ensoniq DOC chip will show up in > > the analog output. Presumeably, the ROM 3 audio cleanup addressed > > this issue. After the noise is injected, you won't be able to clean > > up the part that falls within the audio band, so you can't do better > > than the DOC output.
> > Using an opamp to buffer the DOC analog output prior to demuxing > > in the 14052 shouldn't be necessary, and may introduce crosstalk > > if the opamp bandwidth is limited.
> > Similarly, the TTL control signal does not need buffering. Seems > > like the French design is a bit over-engineered. ;-)
> > The 14052 analog switch should not couple power supply noise into > > its outputs, so you're good there.
> > The opamp circuits are also quite good at rejecting power supply > > noise (though bypassing is always good), so I don't expect that > > to be a problem.
> > If you were generating the analog inputs on the board, then power > > supply noise would be a major factor, but the analog signals are > > generated by the DOC, over which you have no control.
> > > Hi, me again :)
> > > Right i attached a floppy drive and using the drive whilst listening > > > to sound didn't make any difference to the white noise. I switched > > > round the output from the MC1402B (demux) and the white noise shifted > > > from right to left. This i would say eliminates the OpAmp TL084 imo.
> > > I am at the moment just attaching a standard pair of headphones to > > > test with as don't actually have any powered speakers and the line in > > > to my pc doesnt seem to want to work lol (headphones work fine on > > > iphone...so don't suspect the headphones). I do have another pair of > > > better headphones that have a volume control and it would seem that > > > they don't have the white noise, well it doesn't seem so obvious.
> > Is it just because they are lower volume. or is there a real > > difference in just the noise level.
> > This circuit is not designed to drive headphones of any kind--only > > line-level inputs, so that is how you should be doing all your > > testing. Old amplified stereo speakers are about $5 at most thrift > > stores, and will work fine for testing.
> > > Is it possible that though the card is outputting whitenoise that > > > certain speakers/headphones will take out the white noise?
> > It is possible that the headphones are causing the driving opamp to > > oscillate, and that is showing up as increased noise.
> > (BTW, after looking at your circuit, I see that you already have > > a 2-pole active low-pass filter--the first op amp in each channel, > > so don't worry about my previous low-pass comments.)
> > I expect that everything is going to work fine as soon as you > > connect the board to line-level inputs.
> > "The wastebasket is our most important design > > tool--and it's seriously underused."
> Hi Michael,
> Again thanks for your help :). I just bought a pair of powered > speakers from local supermarket and sounds much better, so much so > that i don't think there is a problem. In fact there is less white > noise than on my audio animator...which i was surprised to see..or > hear rather.
> I think the headphones as you said were causing increased noise.
> I think the problem is that i am a bit of a perfectionist and also > didn't want people buying the cards to be disappointed.
> I would like to make a review board up with one of the remaining cards > (have some things to sort out first though for connectors and it wont > have a back plate at this point) and possible get it sent to someone > to play/test with and give me their opinion and possible compare it to > other cards to see if all is as it should be. If anyone is interested > in doing this drop me a message. I would like the card back, but if > you like it i am sure we can negotiate on the cost if you want to keep > the card (and I will send back plate once i complete them...though > assuming i don't get distracted with integrating a digitiser to > it...lol)
> Thanks > Drew
Request for testing of review card has been accepted.
Now that the prototype all works and before i get distracted with dealing with adding input as well as looking at making a card to go into the portable GS that is being put together i am thinking of doing a small run of the version 1.0 card as detailed on my blog (drewbiegs.blogspot.com and www.drew2gs.com).
Minimum order from the PCB company is 15 cards (well 17 but will keep a couple spare). If there is enough interest on here to get 15 cards made I will do a small run. The card will be as pictured on the site but will have a back plate (just waiting for the metal fabricator to send me samples).
Cost wise i think i can do it for about Ł30 + shipping. I think this translates to $49 + shipping at current exchange rate. This is not a profit excercise for me.
I have a test card with Antoine at the moment, so wont send any out until he comes back and says oui :)
If you are interested then please send me an email and when i have 15 people will get them produced. I will have to put them all together, so you might have to wait a bit.
The cards themselves also have the potential to be slotless as I have placed mounting holes and a jumper for +5v and -5v to be taken off somewhere else apart from the A2 slot. Get a box made is on my list, but included that in the original card design so there options
Drew wrote: > If you are interested then please send me an email and when i have 15 > people will get them produced. I will have to put them all together, > so you might have to wait a bit.
Hi Drew,
Would you be interested in supplying a cheaper "kit version" in which you just ship the components and let the buyer assemble?
On 5 Dec, 03:09, "Polymorph" <polymo...@a2central.com.remove-cdq-this> wrote:
> To: Drew
> Drew wrote: > > If you are interested then please send me an email and when i have 15 > > people will get them produced. I will have to put them all together, > > so you might have to wait a bit.
> Hi Drew,
> Would you be interested in supplying a cheaper "kit version" in which > you just ship the components and let the buyer assemble?
> Cheers, > Mike
Hi,
I was thinking about doing that yesterday. I am not adding anything by making them up. I need to go back to my spreadsheet to work out costs for stuff to see if i can reduce the cost. The conversion rate for US/ GB isn't great so though Ł30 sounds alright to me from UK point of view but US$50 prolly sounds a lot elsewhere.
On 5 Dec, 03:09, "Polymorph" <polymo...@a2central.com.remove-cdq-this> wrote:
> To: Drew
> Drew wrote: > > If you are interested then please send me an email and when i have 15 > > people will get them produced. I will have to put them all together, > > so you might have to wait a bit.
> Hi Drew,
> Would you be interested in supplying a cheaper "kit version" in which > you just ship the components and let the buyer assemble?
> On 5 Dec, 03:09, "Polymorph" <polymo...@a2central.com.remove-cdq-this> > wrote:
> > To: Drew
> > Drew wrote: > > > If you are interested then please send me an email and when i have 15 > > > people will get them produced. I will have to put them all together, > > > so you might have to wait a bit.
> > Hi Drew,
> > Would you be interested in supplying a cheaper "kit version" in which > > you just ship the components and let the buyer assemble?
> > Cheers, > > Mike
> Hi Mike did you get my emails?
> Drew
Drew,
I got an email on my a2central account (which I *never* read BTW), but it didn't seem to want to display correctly (there was no content in the email).
Please resend to mike dot a dot stephens AT gmail dot com (obviously cleaning up the obfuscation!).
To: Polymorph Re: Re: Apple IIGS Stereo Sound Card - Interest? By: Polymorph to comp.sys.apple2 on Mon Dec 07 2009 02:07 pm
> I got an email on my a2central account (which I *never* read BTW), but > it didn't seem to want to display correctly (there was no content in > the email).
> On 2 Nov, 14:25, "sfahey" <sfa...@a2central.com.remove-4rb-this> > wrote:
> > To: Drew > > Re: Re: Apple IIGS Stereo Sound Card - Interest? > > By: Drew to comp.sys.apple2 on Mon Nov 02 2009 02:49 am
> > > to do the input i would need lots of help from the group :).
> > Drew, is this project a "more the merrier" or do you want to keep it on CSA2 > > only for now? If you were considering putting these together, and making a > > little $$$ for your trouble, I can put something on A2C but it might mean a lot > > more interest than you're ready for. <shrug> You're blog has been in our > > recommended blog list for several weeks so maybe it won't matter.
> Well at the moment, best to keep it just to CSA2 until i have > prototype board done. Once i really know the effort to put these > together happy for the world to know lol. Thanks for putting me on the > recommend blog list :)...btw its Drewbie GS ;)....not the greatest > name i know lol
> Drew
Lots of sound programs and info on my old website.
On Dec 8, 9:32 am, "sfahey" <sfa...@a2central.com.remove-99j-this> wrote:
> To: Polymorph > Re: Re: Apple IIGS Stereo Sound Card - Interest? > By: Polymorph to comp.sys.apple2 on Mon Dec 07 2009 02:07 pm
> > I got an email on my a2central account (which I *never* read BTW), but > > it didn't seem to want to display correctly (there was no content in > > the email).
Yeah, I tried viewing the email via the HTML interface. Is this a known issue? As I mentioned, I don't really use this email account, but I do use a2central as my news server (which I guess is why my email is being listed as the a2central one).
To: Polymorph Re: Re: Apple IIGS Stereo Sound Card - Interest? By: Polymorph to comp.sys.apple2 on Mon Dec 07 2009 09:36 pm
> Yeah, I tried viewing the email via the HTML interface. Is this a > known issue? As I mentioned, I don't really use this email account, > but I do use a2central as my news server (which I guess is why my > email is being listed as the a2central
Yeah, it's a known issue. The BBS tries to be cute about converting the content to ANSI (showing it's BBS roots). If people use plain text for e-mail, it seems to work fine, but HTML formatted e-mails are hit and more often miss.
I don't know if it's going to be fixed in the upcoming release or not. I'll be upgrading the software and the server hardware when it does come out.
I've also considered dropping the HTML side entirely. It's funky and ugly.
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