Need help, breadboarding a silicon Buzzaround.

[karolisd]

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.

[karolisd]

Anyone?

[LucifersTrip]

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...