[sdiy] AD/DA schematics? quantizers,etc

[Neil Johnson]

Hi,

> http://experimentalistsanonymous.com/diy/Schematics/Fuzz%20and%20Fuzzy%20Noisemakers/Digital%20fuzz.bmp
> 
> i was going to try and build it as it uses an ADC0808 but he only labels pins
> up to 20!....so now i dont know if he just didnt touch pins 21-28 or if i
> have a totally different chip
> 
> this is all very confusing!

As far as I can see:
- it uses an ADC0804, not an '0808 (refer to the respective datasheets)
- it shorts the ADC data _outputs_ to ground, not the inputs to the DAC

> i found another schematic that uses an ADC0804 for the input and it seems
> VERY different than an adc0808 in that it only has a + and a - input
> instead of 8 multiplexed inputs.

Different chip, different inputs.

> in general are the ADC08xxx chips pretty easy to switch for another one in
> the series? or do i need to just go out and order the ADC0804 if thats what
> it calls for?

What does your design call for?  Or are you planning on copying the above circuit?  If so:  you need an ADC0804, and I would change round the switches so you don't short the ADC data outputs to ground.

Cheers,
Neil
--
http://www.njohnson.co.uk