Wah Wah effect not working

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#3
Just don't work !

The negative of the battery goes is conected to the ground right?

Are the capacitors right?

The sound just don't come out of the circuit.

When I don't press the button, the guitar sound is playing normaly (bacause the switch is bypassing the wah), but if I press it, the sound disappear... I built a MUTE button hehehehe :clown:

edit: I forgot ! I'm using BC546 transistors, because I didn't find the 2N3904.
 
#5
No, I don't have breadboard, but this is very simple, should work on the first try ! :smash:

I'm very annoyed with the BC546 and the capacitors values... Are all this right?

I already checked many times the PCB to see if I did any mistake, but is all right with PCB !

I'm doubting of the 0,001uF capacitors on the output, how can the sound come from a 1nF ceramic cap???


Cheers !
 
#12
If you hit the strings really hard, do you hear a distorted 'fart' from the amp for a split second?

That's what my first DIY stompbox (some kind of overdrive, iirc) did, and someone helped me trace it to some kind of biasing problem. I think I had messed up the battery hookup.

You HAVE gone over the whole NPN/PNP/+/-/GND transistors/power thing, right? It's given me a few headaches over the years.

You might also want to make sure you've not fried the transistors when you soldered it all together. Good luck.
 
#13
Looking at the front face of a 2N3904 or any other US numbers transistor in that small package, the three legs are left to right emitter, base, collector. Japanese numbers like 2SC945 are wired left to right emitter collector base.

What is the leg arrangement of your BC transistors? POssibly collector base emitter? If that is the case, when substituting them for the 2N3904 types, they will need to be installed "backwards."

That is one thing that comes to mind for me. Transistors that are electrically the same may often have different pin arrangements. They can be used, but the legs have to be inserted in the correct holes on the board.
 
#16
i might be able to help.... i have a vintage thomas Cry Baby

its just like the dunlop but the dunlop added a couple parts

(i think they added a rectifier or something to prevent reverse bias and a cap to filter voltage)

the 500uH inductor Is the KEY to the wah sound...

the thomas version is the version is the first version and dunlop i belive bought it from them...

(i heard the original wasent copyrighted!!)

like you said the circuit should have worked the first time...

id be willing to help you out if you need...

your board looks like it dosent have all the caps mine does...

OFF TOPIC: i still dont know why i havent added True bypass to my wah...

Here
This IS a pic of my crybabys brain.....
the crack in the corner of the board was there when i got it...
An externally hosted image should be here but it was not working when we last tested it.
 
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