[sdiy] CV/Gate delay project..

Jean-Pierre Desrochers jpdesroc at oricom.ca
Fri Jan 29 20:18:48 CET 2021


> Don't look for shortcuts when it comes to CV. Get decent 16 bit ADC/DAC. They are dirt cheap now.

 

Any ADC chip suggestions ??

At Digikey, the cheapest 5v supply DIP 16bits ADC is Maxim’s  <https://www.digikey.ca/en/products/detail/maxim-integrated/MX7705EPE/1302785> MX7705EPE+ at $15.09US each

16 bits DAC’s are cheaper..

 

JP

 

De : Roman [mailto:modular at go2.pl] 
Envoyé : 29 janvier 2021 13:48
À : 'SYNTH DIY'; Jean-Pierre Desrochers
Objet : ODP: [sdiy] CV/Gate delay project..

 

Don't look for shortcuts when it comes to CV. Get decent 16 bit ADC/DAC. They are dirt cheap now. And I mean decent, because many new 16bit converters have 13-bit linearity  and sometimes even only 10-bit.

Might be a challenge if you require THT though.

 

Roman



---- Użytkownik Jean-Pierre Desrochers napisał ----

Hi list,



I'm working on a new module for my DOTCOM modular.

It would memorize incoming CV's and Gate's state for 2msec up to 10sec 

then spit the stream in steps of 1msec.

The code for Gate memorizing is done.

I'm now wondering if using a Microchip PIC 10bits ADC is

linear enough to read incoming CV values (0 to 8vdc)...

There will be an input buffer amplifier that will take care

of taking down the 0to8vdc to 0to5vdc for the PIC.

Incoming CV's 0-8vdc, 12 semitones/octaves.. that makes 1024 / (8 x 12)..

around 10 steps between each semi-tones.

My worry is the PIC ADC linearity precision..

The 10bits memorized values will be output using a 12bits SPI DAC.

I have a bunch of old PIC16F88 that I want to utilize here.

Old but still usable for SPI.

What do you think about PIC's ADC linearity wise ?



JP



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