Which positive ground wiring?

[andershp]

Hello

I'm building a positive ground tone bender pedal using this schematic:



I can't figure out which positive ground wiring I should use:

The one for negative tip power supplies, the input grounded way or the one for positive tip power supplies?

fx. one of these:

http://www.generalguitargadgets.com/diagrams/switch_lo_3pdt_tb_dcj_pnp.gif?phpMyAdmin=78482479fd7e7fc3768044a841b3e85a
http://www.generalguitargadgets.com/diagrams/switch_lo_3pdt_tb_dcj_pnp_gi.gif?phpMyAdmin=78482479fd7e7fc3768044a841b3e85a
http://www.generalguitargadgets.com/diagrams/switch_lo_3pdt_tb_dcj_pnp_ft.gif?phpMyAdmin=78482479fd7e7fc3768044a841b3e85a

I have a tip polarity converter, so I can use a negative tip power supply with this pedal, however it can't be used together with other NPN (negative ground) pedals on the same power supply. Is it possible to use the same power supply for both NPN and PNP (positive ground) pedals (this one), if the PNP pedal is wired for negative tip power supplies?

What does input grounded mean and should I use that? Why, why not?

Thanks

- Anders H

[petemoore]

  PNP works with the schematic illustration shown.
   Don't parallel a PNP Pos PS with an npn neg gnd. pedal because that will connect the +/- of the power supply, a direct short.
  One way is to use a voltage converter, this works when the 'whine tone' [the inverter fills up the storage cap to the -v in with pulses] is set to high, with no noises.
    Rather than look at inverted PS schematics, know that the inverter ground [PNP Neg Gnd.may cause problems easily fixed by converting the inverted Gnd. to a circuit that has ground connections all to...ground. 
  Another thing to look at is taking care of any and all[/] grounds by having no power supply ground connections, regulated and filtered floating voltage supplies. see GEO: Spyder. Requires dangerous AC mains wiring, explains power supply problems-fixes, commercial units are of course available/affordable though.

[andershp]

I know that the PNP positive ground schematic posted will work, but what I'm asking for is the offboard wiring - the true bypass wiring - and whether that should be made for a negative or positive tip PS.

I'm not trying to build it as a PNP negative ground or anything. The questions are basically:

Can I parallel a PNP positive ground pedal, made for negative tip PS, with a NPN negative ground pedal, made for negative tip PS as well?

Wheter or not; should this circuit be wired with an input grounded offboard wiring?

Thanks

[iccaros]

I know that the PNP positive ground schematic posted will work, but what I'm asking for is the offboard wiring - the true bypass wiring - and whether that should be made for a negative or positive tip PS.

I'm not trying to build it as a PNP negative ground or anything. The questions are basically:

Can I parallel a PNP positive ground pedal, made for negative tip PS, with a NPN negative ground pedal, made for negative tip PS as well?

Wheter or not; should this circuit be wired with an input grounded offboard wiring?

Thanks

do you mean connect them off the same power supply on your peddle board?
then yes

[Earthscum]

You know what? I think you're looking for this: Positive Power for the PNP Fuzzface

The schem doesn't show it, but where the battery negative joins to the ground from the input ring can be connected to the input power switching, as in a normal pedal, ad the power jack is inserted with the normal center ground, positive on the ring/switch. I have to do this to my friend's FF, it's sitting splayed in front of me, actually... lol.