Guitar Reverb Pedal project

Posted on Jul 13, 2012

This circuit was inspired by a friend who wanted a reberb for his portable guitar amplifier. I originally tried using NE5532 low noise op-amps for the buffer stages but they were too noisy for the low level circuits so I switched to discrete 2N3904 transistors, they seem to be fairly quiet. This circuit has a nice feature not found in most reverbs, a drive control for the spring amp. The drive can be turned way up and a nice smooth distortion effect will come out of the spring. The circuit will run on a 9V battery but will probably run it down fairly quickly, it draws about 30ma idle and around 100ma with a full signal going through.

Guitar Reverb Pedal project
Click here to download the full size of the above Circuit.

Be sure to measure the DC voltage from the wall wart, they seldom agree with the label and vary a lot with load current. The circuit should work ok up to 15VDC. I built the prototype circuit right into the reverb spring box for minimal size, it is a

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