I have an old Cry Baby Model GCB-95 bought around 1990-91.
With my new hobby I've been pulling apart my peds to see how they're made.
I just bought a DMM & was checking the resistor values in the Cry Baby for fun.
I came across one that seems bad.
It's marked as a 33000 but I get a 0 reading from it.
Would this mean it's fried & needs to be replaced?
How would this affect the tone?
The ped works but maybe it's lost something with the bad resistor??
Cheers
Sean
The only way you could tell if there was actually something wrong with the resistor would be to de-solder it and test it. If you're testing it on the board, your DMM is measuring the resistance between the two points in question--not only the 33k resistor. In fact, that 33k is in parallel with an inductor, which has a very small DC resistance compared to 33k, not 0, but small enough to read 0 on some cheap DMMs set to measure 33k. If that 33k resistor was actually a short circuit, your crybaby would not make any wah sound what-so-ever. Usually a "burned out" resistor is completely non-conductive. The crybaby doesn't generate any currents that would damage a 33k resistor. It's probably fine.
After about ten 500 pc rolls of resistors, I have found one bad 10k, but that was probably caused by something 'else' like super excessive heat or overly bent/pulled on leads.
Sometimes resistors can be measured in circuit....just don't try it at home lol.
To check in cct, any values higher than the color coded value on the Resistor, [or stated value there in schematic] can be considered wrong, any actual measured In Cct R values that come up lower than the stated resistors color code...the current is probably flowing throught the circtuit using an alternate path than through the resistor....each one must be looked at and analyzed 'in context' with it's circuit...
I've misread color codes...but the resistors were allways within stated tolerances.
Thanks guys!
I measured again & it was actually 11.5 so for
curiosities sake I pulled it out & measured again.
33k! :lol:
Gotta love learning! hehe 8)
Cheers
Sean
That resistor sits in parallel with the inductor, which is under 100 ohms DC resistance. You were measuring the resistance of the inductor. You have to have one lead open to accurately measure a resistor.
Where did I read "Measures capacitance without removing capacitor from the circuit" YEAH!!!!!!
Then in small print, "one lead must be removed for accurate measurement".
boo!