[sdiy] Problems with linearized SSI2164 ?

Mattias Rickardsson mr at analogue.org
Wed Feb 6 23:49:07 CET 2019


Or... maybe I should have read your description once more. The V2164 should
give the same unwanted behavior then I guess. :-)

/mr


Den ons 6 feb. 2019 23:41 skrev Mattias Rickardsson <mr at analogue.org>:

> Hi Danjel,
>
> with 30k for Rin, do you mean one of the 100k in the linear control
> circuit?
> If so, that's probably the reason it misbehaves.
>
> Best,
>
> /mr
>
>
> Den ons 6 feb. 2019 23:19 skrev Danjel van Tijn <danjel at intellijel.com>:
>
>> Hi there,
>>
>> Has anyone else experienced issues with the SSI2164 used in place of a
>> Coolaudio 2164 in a linearized VCA configuration?
>>
>> With no CV applied to the circuit control pin of the VCA should be close
>> to 0 (and it is when I swap back in a coolaudio chip)  but with a SSI2164
>> the voltage at the control pin is around 0.85V.
>>
>> I am using accurate voltage sources for the negative and positive voltage
>> references (-5 and +5). and as aforementioned swapping in a coolaudio chip
>> returns the circuit to working as expected.
>> Opamp is a  TI TL072CPWR.
>>
>> The only two differences from the datasheet version are that we are using
>> 30K for Rin and 510R+560p for stability;  both are within range of
>> acceptable values according to datasheet.
>>
>> Any thoughts?  possibly bad batch of ICs?
>>
>>
>> --
>> cheers,
>>
>> Danjel van Tijn
>> Intellijel Designs Inc.
>> m. +001 604-773-2426 <(604)%20773-2426>
>>
>> www.intellijel.com
>> https://www.instagram.com/intellijel/
>> www.facebook.com/intellijel
>> www.youtube.com/intellijel
>> www.twitter.com/intellijel
>>
>>
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at synth-diy.org
>> http://synth-diy.org/mailman/listinfo/synth-diy
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20190206/10efd48c/attachment.html>


More information about the Synth-diy mailing list