How to wire a power jack to positive ground?

[Focalized]

Using the typical power jacks, how is positive ground done? I figure just reverse everything but the jack has two positive poles and one negative. I want to use the jack and a battery so that the battery is cut off when an adapter is plugged in.

[petemoore]

  so that the V+ and V_ are isolated from each other.
  That means not from the same supply as the Pos Gnd effects.
  Test that the PS isn't shorting before applying power.
  Insulated jack...
  The DC blocking capacitors keep the DC within the circuit.

[davent]

I've only done one positive ground pedal with power jack and just wired the power jack the same as I would in a negative ground pedal except i used a metal power jack so the enclosure and jack were not isolated from each other. Used a stereo input jack and the positive lead from the power jack is connected to the sleeve? tab of the stereo jack and then a wire is run from the ground tab of the stereo jack to the sag pot then to the board. With this, all the jacks, input, output and power are connected together through the enclosure and the positve lead is the only enclosure  ground connection to the board. I didn't try the pedal in a chain with other pedals or try powering externally but the pedal did work fine with battery power.

Hopefully the picture will help make the words clearer.
dave

[Nitefly182]

I've only done one positive ground pedal with power jack and just wired the power jack the same as I would in a negative ground pedal except i used a metal power jack so the enclosure and jack were not isolated from each other. Used a stereo input jack and the positive lead from the power jack is connected to the sleeve? tab of the stereo jack and then a wire is run from the ground tab of the stereo jack to the sag pot then to the board. With this, all the jacks, input, output and power are connected together through the enclosure and the positve lead is the only enclosure  ground connection to the board. I didn't try the pedal in a chain with other pedals or try powering externally but the pedal did work fine with battery power.

Hopefully the picture will help make the words clearer.
dave

I have an important question: what is that!

[davent]

Hi,
Skyripper I've been working on, off and on for ages, currently stalled in the paint stage.
dave

[Focalized]

Thanks for replying.
This picture from GGG is what I think is right.
I'm just making a Fuzz Face so this should be fine.

http://www.generalguitargadgets.com/diagrams/switch_lo_3pdt_tb_dcj_pnp_gi.gif

[Processaurus]

Unfortunately if you or someone you play music with ever daisy chains power with your positive ground pedal with a negative ground pedal (99% of pedals) it will short out the power supply.  There is no easy wiring solution to fix this, as you are connecting circuit ground in your positive ground pedal to power supply (+), and in the negative ground pedal ground is connected to power supply (-).  Connect the two pedal's grounds together with an instrument cable and boom, the power supply (+) shorts to the power supply (-)! 

The only real solution I can think of is to use a charge pump IC like the MAX1044 to generate -9v from +9v like at geofex (just don't connect the +9 in the circuit to anything)
http://geofex.com/circuits/+9_to_-9.htm . 

Either that or just go with the battery, a battery should last a long time.  Or stick 6 C cells in there, ha ha, and never have to worry about the battery ever, even if it gets left plugged in for weeks at a time...

[Focalized]

I use  a Pedal Power 2 Plus. Has isolated power outs.
I just remembered a Fuzz Face I built awhile ago with positive ground. It worked with the Pedal Power.