[sdiy] 2164 outputs

rsdio at audiobanshee.com rsdio at audiobanshee.com
Fri Aug 25 23:49:40 CEST 2017


In situations like these, I use a dual op-amp and invert the signal again. You can also spread the gain across the two op-amp stages, which can help certain scaling requirements.

Brian

On Aug 25, 2017, at 1:51 PM, 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.
> 
> 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!
>> 
>> On 25 Aug 2017, at 19:37, Tim Ressel <timr at circuitabbey.com> wrote:
>>> 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.




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