Can anyone identify these little junctions on this board? Just wondering about their function.
(https://i.postimg.cc/mP8rNwZY/IMG-8450.jpg) (https://postimg.cc/mP8rNwZY)
(https://i.postimg.cc/XZqY2CXT/IMG-8451.jpg) (https://postimg.cc/XZqY2CXT)
Maybe test points that you can put your meter lead tip into while you make adjustments?
they are trim-pots (trimmers), probably for bias or similar applications. what kind of board is that, thats something that helps us find out the function of those trimmers.
cheers
This is actually a Trueman 1966 fuzz I am tracing. First time I've ever seen trimmers like that.
isn't it just a fuzz face without a gain control?
those trimmers bias the transistors.
cheers
The configuration is a little more complicated as there seems to be two of these trimmers on either side of the bias knob which seems a bit odd. The bias pot is a 500k and also seems to be going to Q1's collector and Q2's base. The third trimmer seems to be going to a portion of the bass boost circuit which is one a switch but I'm having trouble understanding the tracing there since there's multiple resistors in series. I going to have to study a bit more to try and make sense of all of it.
QuoteThe configuration is a little more complicated as there seems to be two of these trimmers on either side of the bias knob which seems a bit odd. T
They would be used to set the min and max points so it sounds good/correct over the whole range of the pot.