[sdiy] pre Uprocessor schematics with ADC/DAC?

[Dan Snazelle]

synergy and ppg wave eh? i will go try to find those

thanks guys

--------------------------------------------
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> CC: subjectivity at hotmail.com; synth-diy at dropmix.xs4all.nl
> From: tom at electricdruid.net
> Subject: Re: [sdiy] pre Uprocessor schematics with ADC/DAC?
> Date: Thu, 21 May 2009 21:54:14 +0100
> To: lanterma at ece.gatech.edu
> 
> Yeah, good point Aaron - the PPG Wave is another good example. The  
> oscillator board is a real eye-opener once you get it.
> 
> I hope you enjoy it as much as I did, Dan!
> 
> T.
> 
> On 21 May 2009, at 21:37, Aaron Lanterman wrote:
> 
>> The Synergy is a prime example - the digital oscillator board has  
>> about 120 standard TTL chips.
>>
>> You can find schematics/pics on my Synergy page.
>>
>> But really, all that is easier now with microprocessors or FPGAs.
>>
>> I think the Wave PPG had a lot of logic in the raw, but I'm not sure.
>>
>> Sent from my iPhone
>>
>> On May 21, 2009, at 9:28 AM, Dan Snazelle  
>>  wrote:
>>
>>>
>>> this might be a strange request but i am very interested in ANY  
>>> information/links/ideas on finding old schematics from the 70's  
>>> (audio related but not just necessarily synth) that use Analog to  
>>> Digital Converters AND Digital To Analog converters but which use  
>>> logic instead of a microprocessor to control them.
>>>
>>> all the synths i have looked at that have ADC/DAC setups have a  
>>> programmed brain of some kind controlling them (prophet 5, etc)
>>>
>>> but i know there were some that used TTL or CMOS to send commands.
>>>
>>> anyway....one particular example is the EVENTIDE H910.
>>>
>>> i think i could learn some interesting things, such as how they  
>>> got the Audio In and Out, how they used multiplexers or sample and  
>>> holds, and also what types of clocks, and if they had presets,etc.
>>>
>>> thanks!
>>>
>>>
>>>
>>>
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>