For my second homebrew pedal project, I managed to make a Ge FF that I am quite pleased with. Just plugged in Ge trannys from smallbear and Steve's recommended resistor values that came with them. In learning more about this circuit I took readings on the transistors:
Q1 C -.66, B -.10, E 0
Q2 C -6.78, B -.65, E -.5
Is the collector on Q2 a little high? Steve's supplied values advised a 39k/470/3.9k with a 150k feedback resistor. The 3.9k is about half the *stock* 8.2k. Would raising this lower the collector voltage? Should I care, since I basically am happy with the sound?
Ever tweakish
Kerry M
A 10k trimpot would give you the option to tweak w/out having to lose what you've already got.
Regards
RDV
Quote from: RDVA 10k trimpot would give you the option to tweak w/out having to lose what you've already got.
Regards
RDV
I wasn't sure which value to try changing first, but I did indeed just replace the 3.9k with a trimpot, and dialed the collector down to about -4.7v. Seems to clean up better now. Can't test it too much at 3am, so I'll see how it does at the gig tomorrow.
thanks
Kerry m
Quote from: bwanasonic
Is the collector on Q2 a little high? Steve's supplied values advised a 39k/470/3.9k with a 150k feedback resistor.
Funny, my matched pair had the same exact resistor values. I was getting about 7v on Q2, but replaced the resistor with a pot, and it seems to sound better.