<html><body><font face="Helvetica">Why can't you just reverse the inputs?<br><br>Ian<br><br><br>Sent from XFINITY Connect Mobile App<br><br><br>------ Original Message ------<br><br>From: Tim Ressel<br>To: Tom Wiltshire<br>Cc: SYNTH DIY<br>Sent: August 25, 2017 at 2:55 PM<br>Subject: Re: [sdiy] 2164 outputs<br><br>Nice idea, but I don't have that available. The problem is the VCA stage <br>as shown inverts. Not usually an issue for audio but I am using it as a <br>dc vca for control voltages.<br><br>--tr<br><br><br><br>On 8/25/2017 1:02 PM, Tom Wiltshire wrote:<br>> 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<br>> It’s a change in thinking from voltage to current, but it works just the same!<br>><br>> HTH,<br>> Tom<br>><br>> ==================<br>> Electric Druid<br>> Synth & Stompbox DIY<br>> ==================<br>><br>>> On 25 Aug 2017, at 19:37, Tim Ressel <timr@circuitabbey.com> wrote:<br>>><br>>> Hi,<br>>><br>>> 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.<br>>><br>>> Thanks!<br>>><br>>><br>>> -- <br>>> --Tim Ressel<br>>> Circuit Abbey<br>>> timr@circuitabbey.com<br>>><br>>> _______________________________________________<br>>> Synth-diy mailing list<br>>> Synth-diy@synth-diy.org<br>>> http://synth-diy.org/mailman/listinfo/synth-diy<br>><br><br>-- <br>--Tim Ressel<br>Circuit Abbey<br>timr@circuitabbey.com<br><br>_______________________________________________<br>Synth-diy mailing list<br>Synth-diy@synth-diy.org<br>http://synth-diy.org/mailman/listinfo/synth-diy<br></font></body></html>