Modular Synthesizers : Song Writing : Electronics : Video Production.
Thursday, February 7, 2013
Variable Inverting to Non Inverting OP AMP amplifier
This is a pretty simple but useful circuit I put together. It's basically a variable inverting/Non-inverting amplifier. When the pot is all the way left, the signal is Non-inverted. All the way right, it's inverter. the center has no output. I designed the circuit to mimic a property on my Synthesizers.com State Variable Filter module. From I can tell, it works exactly the same. I was surprised when I tried searching for an op amp set up that would do this, I couldn't find one. I probably just don't know what its actually called. Anyway, here's the design I came up with.
I used a 741 to test it out.
In this video, I used it on my Filter with a triangle wave. as you turn the knob, the signal attenuates all the way to 0, which is about center, then it begins inverting