Meathead & Meathead Deluxe making a humming noise

[Ofek Deitch]

Hi,

I recently built the above to pedals, and no matter what I do, I get a humming noise (in addition to awesome fuzz tones).
I tried replacing the transistors but I guess this has nothing to do with the transistors. I tried BC109\8, 2N3904\2n5550.

Is is necessary to measure voltages?

The layouts I used were taken from the below links (though I made my own from these, because I don't like to use stripboards):

D*A*M Meathead - http://tagboardeffects.blogspot.co.il/2013/04/1-knob-fuzz-bonanza.html.

D*A*M Meathead Deluxe - http://tagboardeffects.blogspot.co.il/2012/01/dam-meathead-deluxe.html.

Thanks for any help!
Ofek

BTW - the Meathead is a finished build, and the Meathead Deluxe is only built on my Porto-type Board.

[JustinFun]

Is this with batteries, or a power supply?

Try a 100r in series with the 9v input (before the 47uf to ground).

[psychedelicfish]

Have you got any ground loops? If you're using metal jacks then you can't connect the ground of the input to the ground of your output without making a ground loop through your enclosure

[Ofek Deitch]

Is this with batteries, or a power supply?

Try a 100r in series with the 9v input (before the 47uf to ground).

I'm using batteries. And I'll try putting a resistor tonight.

Have you got any ground loops? If you're using metal jacks then you can't connect the ground of the input to the ground of your output without making a ground loop through your enclosure

I'm using regular crappy Tayda jacks.

[GibsonGM]

The 100R is generally only for wall-wart type power supplies. Batteries should be stable enough not to hum - it's the power supply that makes noise.

I'd check ALL your grounds, and make sure there's no loop...disconnect your jacks, isolate them from enclosure, have only one path to ground - that stuff.  If it's quiet then, then you will know you have loops going on.

High gain circuits are VERY susceptible to picking up junk and noise in those ground paths!    Other than that, there are some other hum making issues....poor solder joints, shorts to something that shouldn't be connected, finally - possibly damage to a component.

I put my money on loops, in your case, since the circuits work....good luck!