Simple buffer and phase inverter

10/16/2017

Here is a small utility board - a simple buffer followed by a phase inverter. You can take the output from either stage. It can be very useful if you are adding a clean blend to a circuit that is inverting the phase.

I recommend putting this in front of your main effect, but keep in mind that not all effects will respond the same with a buffer in front. I didn't include polarity protection, DC filtering and an output capacitor since this is meant to be used together with another effect (not stand alone).

5 Comments

Michael

2/12/2018 05:14:53 pm

Hi, I built this and it seem to work just fine. It took me two hours of troubleshooting until I read your last remarks though :) Is it possible to use this at the end of a pedal chain before a last splitter? And what value cap would you choose for the output cap?

Fredrik Lyxzén link

2/13/2018 01:40:58 am

Hi Michael,
Yes, you can put it at the end of a pedal chain. Capacitor value isn't critical (anything from 100nF upwards will be fine) unless you will put a volume pot directly after the output cap, then the cap + pot will act as a highpass filter when turning down the volume. In that case, use a large value, like a 2.2uF electrolytic cap (the negative leg going to the pot) to avoid too much lowend being cut.

Michael

2/13/2018 09:07:28 am

That was exactly what I wondered, thanks a lot!

Sebastian

7/27/2018 07:31:01 am

Hallo Michael,
i would use your circuit for my Fulltone Tube Tape Echo. There is a 440 ohm output impedance. That’s why I need a buffer. It is possible to use your circuit for that and could I operate it with 12v?
Cheers, Sebastian.

Fredrik Lyxzén link

9/27/2018 07:05:56 am

Yes, it should work fine with 12v. Just remember to add an output capacitor (any value 100nf - 10uF will work. Negative side to the output).

Simple buffer and phase inverter

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