[sdiy] My new dotcom module.. M114 Dual CV-GATE delay

Jean-Pierre Desrochers jpdesroc at oricom.ca
Fri Dec 2 23:23:32 CET 2022

As I can remember, if you increase the delay while playing
the result will follow keeping the old data processed and adding new delayed signal..

But decreasing the delay while playing will kill the stored RAM data
that was exceeding the new smaller delay RAM area.

Thanks for your interest !

BTW it’s interesting to get replies from an old may 2021 email ! 



De : Mattias Rickardsson <mr at analogue.org> 
Envoyé : 2 décembre 2022 16:38
À : Jean-Pierre Desrochers <jpdesroc at oricom.ca>
Cc : Synth DIY <Synth-diy at synth-diy.org>
Objet : Re: [sdiy] My new dotcom module.. M114 Dual CV-GATE delay


Interesting... So, can you "scratch" back and forth on the delay time knob in order to go back and forth in recorded time? :-)




Den tors 20 maj 2021 23:52Jean-Pierre Desrochers <jpdesroc at oricom.ca <mailto:jpdesroc at oricom.ca> > skrev:

Hi all,


After some 6 months of hard work and with the precious help
of Roman Sowa (member of this DIY forum) I finally went through
the final tests and am very happy to introduce my new born M114
which is a Dual 2msec to 10sec CV-GATE delay.
Whatever CV/GATE comes in will be stored and sent back
with a specific dialled delay.
All this design’s traffic is made around talking SPI devices which are:

- 1 x 64k x 8 SPI SRAM
- 2 x 16 bits SPI ADC

- 2 x 16 bits SPI DAC


Storing the incoming GATE pulses and restoring them delayed was easy task,
but the most tedious part was to actually store the 2 incoming 
CV voltages in 16bits chunks without losing any precision.

Well Roman Sowa came with a nice design of 2 SIP modules
that did the ADC and DAC conversion within +/1 LSB precision.
You can see some pictures below..
And.. as usual this is an open source project so all the needed files are available HERE <http://www.arcenson.com/projects/Modular/M114_CV-GATE_DELAY/> .


Enjoy !






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