Barbarello Fuzz from Pop Electronics
Here is another fuzz circuit from an old issue of Popular Electronics. It is a James Barbarello design that uses a 741 opamp to overdrive a PNP germanium transistor to create the distortion. However, with all that gain on the 741 with only a 4.5v supply range, it is almost certainly creating distortion before the signal gets to the transistor.
I would make a couple of mods to the circuit if I were building it today. I would add a 1uF film capacitor in series with the input before R1. Also, R6 and R7 are not needed; leave them out.
The power supply, which uses three AA batteries could probably be reworked to make the circuit run off a single 9v, but that’s a project for a rainy day.
The 2N404A transistors that I sell should be a good substitute for the 2N705 used in this unusual design.
Get the pdf file of the complete project here.
Cool! I was looking for this article. I built this pedal once for my guitar player back in the 80′s. It got some great fuzz tones.