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I'm Back- sort of

SparkyCal

Mar 11, 2020
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Now that we have this circuit working, I am going to rebuild it from scratch; only because I was modifying it along the way, as we adjusted the circuit, and, as a consequence, it was not as tidy as I would have liked.

Before I do the rebuild, I just want to make double sure that I am working from the right schematic. This is the one we landed on right AG?

https://www.electronicspoint.com/forums/threads/im-back-sort-of.295105/page-9#post-1815151. The one at post #165 called preamp.png. correct?
 

Audioguru

Sep 24, 2016
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The opamp circuit in post #165 has no distortion diodes so its massive gain of 221 times will cause 7V peak-to-peak squarewaves at the 1uF capacitor output. if the opamp is in a pedal at the guitar and connects to an audio cable then it needs a 100 ohms resistor on series between the 1uF output capacitor and the cable.
Diodes in the feedback loop will reduce the gain, reduce the output level to about 1.2V peak-to-peak and produce different-sounding squarewaves.

Don't you still want the gain adjustment, tone control and volume control in the other thread?
 

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SparkyCal

Mar 11, 2020
849
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Mar 11, 2020
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You're right. I should,d have been clearer. I am working from the two schematics you just put up in your last post- which is what I was working from last time.
 
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