Print Page - Screwdriver—Sound but no fuzz

Title: Screwdriver—Sound but no fuzz—FIXED
Post by: Droogie on March 30, 2014, 09:14:27 PM

Built an SMD (through-hole trannies). Got sound and all controls "work" bu no fuzz just clean boost. 4001 for D1. I may have switched 9v and ground first time I tested :-[

Here's what I get for voltages:
Q1: BS170
S 2.3
G 4.1
D 7.5

Q2: 2n5088
C 1.8
B .62
E 0

Q3: OC140
C 3.4
B .62
E .51

I read in another help thread that Q2 C and Q3 B should be the same...

Any thoughts? Thanks!

Title: Re: Screwdriver—Sound but no fuzz
Post by: mattlee0037 on March 30, 2014, 09:20:32 PM

Just looked up an internet schematic and it seems they should be the same the collector of Q2 goes directly to the base of Q3

Title: Re: Screwdriver—Sound but no fuzz
Post by: Droogie on March 30, 2014, 10:04:16 PM

So the collector of Q2 should be more like .62 volts. That's a start. Anyone have good voltages for all the Qs?

Title: Re: Screwdriver—Sound but no fuzz—FIXED
Post by: Droogie on April 01, 2014, 12:00:18 PM

I swapped out the 100u electros and bingo! Guess they didn't like being fried. I'll be sure to bake next time...

madbeanpedals::forum

Projects => Tech Help - Projects Page => Topic started by: Droogie on March 30, 2014, 09:14:27 PM