For share my happyness

[Lee]

You know guys,today is the most happy day I spent  .Finally!I `ve sove the noise problom of the sansamp gt2 clone today!
I  used a diode to conect the guitar line`s GND  and the PCB`s GND  ! Those noise has gone !Forever!   HAHAHAHAHA !

[Peter Snowberg]

Hmmmmm I wonder what was causing that??  :?

Congratulation on solving your problem!

[Marcos - Munky]

Congratulations, Lee. This is a way to reduce noise that I never heard about.

[smoguzbenjamin]

That would be a way of stopping ground loops.... interesting.

[Jason Stout]

How are the diodes pointing? Anode or cathode to ground?

[niftydog]

it won't "stop" ground loops, but it cuts the frequency in half, so a 60Hz hum becomes a 30Hz hum, which is probably below the freq response of most amplifiers.

[Lee]

I don`t know how does it works``but it is working``And the diode is 1n4148  ,anode point to the GND on board, cathode point to BAT ' - '  and guitar `s GND.

I dicided to change it  to 1n4007 just check if it could make the noise more lower``  It can also stop the wrong power supply I think.

[zener]

Hey Lee, nice to know you were able to tame that beast.  I've built that thrice already. The first two ended up as a squeal machine. :x  The last one ended up better than the first two but there's still some noise as I turn level/high/drive controls.

Can you elaborate more on the noise you encountered before putting the diode in series with ground. thanks