How can i use my tonebender mk 2 ( pnp germ ) with my "standard" power supply

[JebemMajke]

How can i use my tonebender mk 2 ( pnp germ ) with my "standard" power supply, negative ground one? What do i need to make in order for that to work?

[Arcane Analog]

If it is wired as per standard wiring schemes it should work just fine as is.

[JebemMajke]

You mean connect + to the ground and - to power? But wouldn't that cause problems when interacting with other pedals connected to that power supply?

[lowbrow]

You would need to build in a charge pump circuit to generate -9 volts for your power rail. It's a simple one IC chip and two electrolytic capacitor circuit. Many people recommend the Maxx 1044 chip, but I prefer a 7660SCL myself. There are threads here that talk about it, but you can also look here:

http://tagboardeffects.blogspot.com/2012/05/negative-voltage-inverter.html

[JebemMajke]

That's it. Great. 7660scl has the same pinout as max 1044?

[Arcane Analog]

You mean connect + to the ground and - to power? But wouldn't that cause problems when interacting with other pedals connected to that power supply?

Yes. You do not need a charge pump at all to use a standard supply. Wire it up as a standard PNP MK2. You power supply will work just fine as is. The only time you need a charge pump is to daisy chain the effect with other pedals that have the standard negative ground. Just use this wiring diagram.


http://www.generalguitargadgets.com/pdf/ggg_sw_3pdt_tb_pnp_dcj_gi.pdf

[pinkjimiphoton]

yah 7660 is the same.

you DO need a charge pump if you wanna daisy chain the pedals, if i'm reading this right.

[Jederino]

Soooooo, would the above diagram Fromm GGG also apply to the Fuzz Face I built from GGG?  Mine is the boutique 60's ver., PNP, and negative grounded (although currently not working, so I am debugging it).

Thanks!

[pinkjimiphoton]

yah, same deal. you can either put one in each pedal, or put one in a box with a couple positve ground outlets, but make sure they are insulated from the case and/or npn pedals or it'll short everything out.

i've heard you can run pnp's backwards with no issues from some people, but haven't tried it.

[JebemMajke]

I can find  7660 SCPA, no SCL in my area. Will that be an issue?

[pinkjimiphoton]

no idea, check the data sheets and compare specs

[JebemMajke]

I can;t seem to find any 7660scl datasheet. I've found 7660scpa but no scl.

[Arcane Analog]

How can i use my tonebender mk 2 ( pnp germ ) with my "standard" power supply, negative ground one? What do i need to make in order for that to work?

The original question simply asked how you implement a standard power supply with a positive ground MK2. The answer is wire it as per usual - nothing extra or different is required.

Daisy chaining PNP and NPN effects is an entirely different question.

[Arcane Analog]

I can;t seem to find any 7660scl datasheet. I've found 7660scpa but no scl.

I think you can buy the 7660SCPA or equivalents from Mouser for less than the Max1044.

[lowbrow]

I can;t seem to find any 7660scl datasheet. I've found 7660scpa but no scl.

My bad, I got those trailing letters wrong. The important thing is it must have the S after the numbers. What you found will work great. And yes, the pin out is the same ad the 1044.