Power Converting Circuit for PNP/Pos. Ground?

[bwanasonic]

Curious about the implied circuit in the Dyna Ranger:

http://www.dividedby13.com/accessories.html

we've added an "onboard" power converting circuit to allow the use of standard 9V power supplies in place of batteries

Especially interested in a practical way to run a PNP/Pos. Gnd Rangemaster in the same enclosure as a neg. ground effect sharing the same power jack.

Kerry M

[R.G.]

I suspect that they used a MAX1044 to convert incoming +9V to -9V. See GEO: "+9V and -9V from One Battery"
http://geofex.com/circuits/+9_to_-9.htm

[pbrommer]

In reading from other threads, and being somewhat n00bishy (getting there - learning more each day), in your guitar chain can you put positive and negative ground effects in series? I know that positive ground with negative supply = kaput. But, can you say have Gus' NPN Boost into a Ragemaster (or vice versa)? Just wondering before I go blow someting up once I box circuits up and put them together (like using a RM on ROG's English channel).

[bwanasonic]

in your guitar chain can you put positive and negative ground effects in series?

If you mean simply plugging a cord from one effect to the other, it's not  a problem, and I strongly advise the practice! The power supply thing is the problem when mixing and matching.

As far as the idea of pairing a pos. gnd and a neg. gnd effect in the same enclosure, I think there might be more than just getting -9v and +9v to each effect, namely how do you ground everything? :oops:. I like the AMZ Mosfet boost for it's versatilty for both clean and pushed-amp dirty sounds, and I like the Rangemaster for pounding a slightly dark and dirty tube amp. Having the two circuits in one box would cover a lot of ground, but maybe I should try and come up with a NPN/Neg. gnd. Rangemaster that is as good sounding and hiss free as my CV7003 version.

Kerry M

[R.G.]

As far as the idea of pairing a pos. gnd and a neg. gnd effect in the same enclosure, I think there might be more than just getting -9v and +9v to each effect, namely how do you ground everything?

You're making it too complicated.

For two effects, one box, there is and can be only one ground. Signal is referred to signal ground, and so are the power supplies.

To put a tube screamer (negative ground) and a Rangemaster (positive ground) in the same box, you connect the signal grounds together, then feed +9V to the tube screamer and -9V to the Rangemaster.

The only problem then is where to get the +9 and -9. Two batteries works fine. But there is a second way, by using a power voltage inverter like the MAX1044 or the 7660 to make -9V from the +9V. They still share a ground (in fact, for the converters, they have to) and you get +9 for the tube screamer or whatever, and -9V for the PNP positive ground.

[bwanasonic]

For two effects, one box, there is and can be only one ground. Signal is referred to signal ground, and so are the power supplies.

This is one of those basic concepts I haven't quite wrapped my head around yet. Thanks for the info and the incentive to read more about it.

Kerry M