pos ground/ neg ground

[clamup1]

ok i know ive asked this before but i think i can explain it better this time.

i jsut built a pnp fuzz face pos ground w/ 9v bat. if i hook the fuzz up to a neg ground pedal w/ 9v bat will the fuzz short out the other pedal through the input jack. or do the output/ input caps block the power?

i hope i explained this well enough. i want to build a fuzz for a friend of mine and i dont want it shorting out his other pedals

[R.G.]

ok i know ive asked this before but i think i can explain it better this time.

i jsut built a pnp fuzz face pos ground w/ 9v bat. if i hook the fuzz up to a neg ground pedal w/ 9v bat will the fuzz short out the other pedal through the input jack. or do the output/ input caps block the power?

i hope i explained this well enough. i want to build a fuzz for a friend of mine and i dont want it shorting out his other pedals

If you have a positive ground pedal and a negative ground pedal, there is no possibility of there being a power supply problem as long as both are powered by a separate, independent battery for each pedal. The positive ground pedal connects the positive terminal of its separate battery to signal ground. The negative ground pedal connects the negative terminal of its separate battery to signal ground. The signal ground connects the two pedals together, and nothing is shorted.

The problem comes in whenever you try to connect both pedals to a common power supply. Now the positive ground pedal connects the positive side of its power wires to ground. The negative ground pedal connects the negative side of its power wires to ground, and ground then connects the positive and negative wires both to ground - t he power supply is shorted and nothing works.

Bottom line: if there is no external power jack on the positive ground pedal, there is no shorting problem because it must use a separate internal battery. Problem solved. If there *is* an external power jack on the positive ground pedal, then your friend *must* use a separate power supply for the positive ground pedal (or pedals) to keep the power supply from being shorted.

There are two possible solutions you can do to keep him from shorting out his pedal power.
(1) make the positive ground pedal be battery only, no external DC jack
(2) use the inverted ground setup where the positive ground pedal is faked into a negative ground. I do not recommend this, although sometimes you can get away with it. Sometimes you can't, and the only way to fix it is to re-convert away from the faked negative ground back to positive ground. This is why I mention this last.

Tell your friend to either use batteries or a separate supply for the positive ground pedal.

[clamup1]

cool thanks R.G.