FuzzDog Super Skwisher power problem - Help

[ANTHROTONY]

Hi everyone,

So the IC LM13700 first....
Pin 1  1.33v
3  4.07v
4  4.07v
5  1.6v
11 8.29v
all other pins including pin 6 are zero volts

Q1  pin 1= 0v  pin 2 = 0v  pin3 = 8.27v
Q2  pin 1= 1.09v  pin 2 = 1.63v  pin3 = 7.17v
q3   pin 1= 0v  pin 2 = 0v  pin3 = 8.23v
Q4  pin 1= 0v  pin 2 = 0v  pin3 = 8.23v
Q5  pin 1= 7.68v  pin 2 = 0v  pin3 = 8.28v

Hope this proves meaningful to you. Not so much for me except pins 6 and 11 on the IC

Cheers,
tony

[Slowpoke101]

The voltages on Q1 are a bit odd. Pin 3 (Collector? ) is OK but pin 2 (Base? ) is at 0V. It should be about 4V
Pin 1 (Emitter? ) is also too low but that is due to the absence of bias volts on the Base.
Find out where those volts have disappeared to. Check the board for any solder bridges that may be causing short circuits. Also make sure that the resistors R3 and R4 are the correct value.


Edit: Just checked my notes and I've made a mistake - so what else is new  .
       Q1 base should be near 2V and the emitter should be around 1.5V

[ANTHROTONY]

Thanks Slowpoke101. I have the spec sheets for the transistor and will need to read it more thoroughly in order to understand the relationship between pins 1,2, and 3 and emitter, base, and collector. I think you are right though. Regarding the voltages, I will follow the path of the circuit and see what I can turn up. Meanwhile, here in France, it's another sunny spring day before a few wet days are forecast, and I'm being obliged by my wife to get outside and work on the garden. About as big a contrast as possible between debugging a compressor pedal and de-weeding large flower beds!