[sdiy] pre Uprocessor schematics with ADC/DAC?

Tom Wiltshire tom at electricdruid.net
Thu May 21 18:47:27 CEST 2009

On 21 May 2009, at 14:28, 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.

If you thought learning uProc programming was complicated, you'll  
soon find out that it's a lot easier than trying to do similar things  
(presets etc) *without* a uP!

That's not to say that it can't be done, but there was a reason that  
uPs became so ubiquitous.


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