[sdiy] CEM3360 tolerances

[Tom Wiltshire]

If I was exposing the CV inputs to the outside world, I’d protect them from negative voltages with a precision half-wave rectifier. You may be right that there’s no risk given the limited current, but I can’t say for sure and a couple of diodes don’t cost much.

In a synth voice design (where most of the existing designs for these are found) the situation is much more controlled and such efforts aren’t required.

Tom

==================
       Electric Druid
Synth & Stompbox DIY
==================

> On 10 Apr 2018, at 22:50, Schwarz Raphael <raphschwarz at gmail.com> wrote:
> 
> Hello Everyone!
> 
> Anybody has some experience with the CEM3360 VCA ?
> 
> http://www.alfarzpp.lv/eng/sc/AS3360.pdf
> 
> Seems almost too easy .
> 
> The datasheet specifies a control voltage from 0 to 2.08 V maximum, however it doesn’t specify anything for negative voltages 
> 
> There are few schematics in the modular realm for this one except for two digisound modules 
> 
> This one seems like a good example
> http://www.digisound80.co.uk/digisound/modules/80-19_files/80-19.pdf
> 
> There seems to be no protection against any negative voltage on the control input , except from the voltage divider bringing everything within a 2V amplitude
> My guess is there is not enough current to damage the chip with negative voltages but I want to be sure before i start burning chips.
> 
> Thanks !
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