[sdiy] pre Uprocessor schematics with ADC/DAC?

[Tom Wiltshire]

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  
> <subjectivity at hotmail.com> 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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