[sdiy] 2164 outputs

[Neil Johnson]

Tim,

I think whatever you're going to end up with is two opamps unless you can
do the inversion somewhere else in the CV path.

Neil


On 25 Aug 2017 22:52, "Tim Ressel" <timr at circuitabbey.com> wrote:

> Nice idea, but I don't have that available. The problem is the VCA stage
> as shown inverts. Not usually an issue for audio but I am using it as a dc
> vca for control voltages.
>
> --tr
>
>
>
> On 8/25/2017 1:02 PM, Tom Wiltshire wrote:
>
>> The best way to save an op-amp in this situation is to feed the output
>> into another current input, like another 2164 VCA, or a subsequent mixer
>> stage (no need to go VCA->I2V->mixer) or etc etc
>> It’s a change in thinking from voltage to current, but it works just the
>> same!
>>
>> HTH,
>> Tom
>>
>> ==================
>>         Electric Druid
>> Synth & Stompbox DIY
>> ==================
>>
>> On 25 Aug 2017, at 19:37, Tim Ressel <timr at circuitabbey.com> wrote:
>>>
>>> Hi,
>>>
>>> So the datasheet for the 2164 shows the output always routed to an
>>> inverting opamp configured as a current to voltage convertor. Is it
>>> possible to configure the 2164 output with a resistor to ground and a
>>> non-inverting opamp buffer? I am trying to have an opamp package.
>>>
>>> Thanks!
>>>
>>>
>>> --
>>> --Tim Ressel
>>> Circuit Abbey
>>> timr at circuitabbey.com
>>>
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at synth-diy.org
>>> http://synth-diy.org/mailman/listinfo/synth-diy
>>>
>>
>>
> --
> --Tim Ressel
> Circuit Abbey
> timr at circuitabbey.com
>
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