[sdiy] Problems with linearized SSI2164 ?
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. :-)
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
> If so, that's probably the reason it misbehaves.
> 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?
>> Danjel van Tijn
>> Intellijel Designs Inc.
>> m. +001 604-773-2426 <(604)%20773-2426>
>> Synth-diy mailing list
>> Synth-diy at synth-diy.org
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