I'm wondering if it would be worth the trouble to try different opamps. Maybe it's based on something else, I don't know. I'm wondering if anybody else has messed with this circuit. I guess I could add a voltage divider before the volume pot if I want to tame the volume some on mine. I don't know how the overall volume compares to the original because that is set internally with the trimmer, and I don't want to mess with that setting since it's not my pedal. I put an 18k resistor in parallel with it to make 10k, but I ended up pulling the 18k for more fuzz range. For the fuzz control I used a 25k pot because I had it handy with wires on it already. I just copied the top part of the schematic, with a 100k pot for a volume control instead of a trimmer. So my clone works fine, and sounds pretty much like the original. Here's a not-so-great copy of the schematic:Ī slightly better. I had an LM741 handy so I built a clone on the breadboard. Sounds really cool going into my Dynacomp. Quite different from a BMP or FF, more midrangey and can do overdrive pretty well. Well I agree that the fuzz is indeed pretty cool. Easy repair, just a loose wire, actually never soldered to the PCB at the factory back in 1991. He said the fuzz was cool, but had quit working. You can connect any AC/DC electric appliance with the relay to operate it with this circuit such as lamp, fan, LED lights, etc.So I was fixing a Morley BFW Fuzz/Wah for a friend of mine. The relay’s voltage should be the same as the input voltage. By increasing its value you can increase the preset time period, 1uf gives a time delay of approximately 30 seconds. The preset time period for the activation of LED or the relay depends on the value of the 1uF capacitor. A 1N4007 diode is used across the relay to save the circuit from the back EMF of the relay. Now the amplified output is sent to the relay. Whereas in figure #2, the output of this IC is not enough to drive a relay directly therefore a 2N3904 transistor is used.

The working of this circuit is simple on pressing the push button S1 it sends an input signal to the operational amplifier IC LM741, and it sends the signal to the LED. the difference between both the circuits is of the output, in figure 1 the LED will glow for a specific time period on pressing the push button S1 and in figure 2 the relay will be activated by when push button S1 is pressed. The operating voltage of both the circuits is 9 to 12 volts DC.

Lm741 pinout download free