PNP or NPN

[goofball_11]

Hey, i was lookin for this in the search but i wasnt gettin anywhere. I read somewhere about wiring a negative ground pedal with PNP transistors was harder than positively grounded PNP circuits, (specifically fuzz faces). Is this true? I know its probly been asked and i honestly made an attempt at searchin so please dont dismiss this 

[rockgardenlove]

Info at www.geofex.com

[R.G.]

If you take a circuit which is primarily PNP transistors and originally designed for positive ground and attempt to make it negative ground by just reversing which battery terminal you call "ground" as is the common wisdom for doing this, it works sometimes, even maybe most of the time.

But a significant fraction of the time it causes intractible noise and oscillation which can only be cured by un-converting it back to positive ground.

An expert can take his chances on this, but beginners should stay clear and not try it. Beginners have enough problems getting the basics down. Putting an abstract, difficult and odd failure mode into a design may well sink a beginner's project.

Don't try this unless you have a lot of experience and are prepared for it not to work.