[sdiy] pre Uprocessor schematics with ADC/DAC?

[Aaron Lanterman]

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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