Hi, I'm currently breadboarding a silicon Buzzaround fuzz. I've changed it to negative ground, substituted q1 and q2 for a mpsa14 darlington transistor, used a 2n3904 for q3, changed the diode for a 1n4148. I've read that using silicon transistors in a mk3 type circuit, you need to put a resistor between the collector and base of q3. I've put a 330k in there. That way I'm getting 0.6v on the base of q3. With it I'm getting a lot of sustain, but the buzzaround has a lot of hum. Without the resistor, it has a really poor decay :(. What can I do to prevent the hum? Also, when turning down the balance pot, the voltage on q3 base decreases, so I'll probably put a fixed resistor in there.
Anyone?
did you try adjusting the BC resistor on Q2? did you try adjusting the bias on Q1?
you can also get hum with misbiasing, poor grounding, poor shielding, etc...