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Projects => Tech Help - Projects Page => Topic started by: mjcyates on September 18, 2014, 12:58:33 AM

Title: Need help with Bonamassa FF
Post by: mjcyates on September 18, 2014, 12:58:33 AM
So I built the Bonamassa Fuzz Face using the board from Panos. I cannot get the transistors to bias high enough. Q1 is around -.34 give or take and Q2 is around -4 give or take. Any ideas what might be the problem. I double checked all component values.
Title: Re: Need help with Bonamassa FF
Post by: teknoman2 on September 18, 2014, 07:56:24 AM
Hi mate,
For start can you post your voltages of q1 and q2.
Check the correct pin out of the trannies, especially q2.
Title: Re: Need help with Bonamassa FF
Post by: mjcyates on September 18, 2014, 12:33:04 PM
Q1 approximately -.34 Q2 approximately -4.0
Title: Re: Need help with Bonamassa FF
Post by: teknoman2 on September 18, 2014, 12:37:35 PM
Can you please post EBC voltages and pin5 of tc1044?
Also with those voltages when you engage the effect is there any fuzz out?
Title: Re: Need help with Bonamassa FF
Post by: mjcyates on September 19, 2014, 11:00:58 AM
Q1 - E= 0      B=0  C=-.5
Q2 - C=-2.80 B=-.51 C=-.47
Pin 5 = 9.49
I was getting some very faint fuzz signal, now I am getting nothing
Title: Re: Need help with Bonamassa FF
Post by: teknoman2 on September 19, 2014, 11:38:19 AM
Your Q1 voltages are not very off.
Despite that yesterday you did post Q2 collector voltage 4.0V and now is 2.8V.
Did you change anything?
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