Problem with positive ground - PLEASE HELP!

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oinkbanana
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Re: Problem with positive ground - PLEASE HELP!

Post by oinkbanana »

i have a monsterpiece two headed PNP & NPN.
Monsterpieces wrote:the NPN is a negative ground circuit, and the PNP is a positive ground circuit necessitating the separate power sources

Both sides run off of either 9 volt battery or center negative, barrel plug 9 volt DC adapters. The NPN can be daisy chain powered with most other pedals because it has the more predominant negative ground circuitry, but the PNP will need it's own dedicated power source because of it's positive ground circuit.

it's kind of annoying.




Scruffie wrote:However it is entirely possible for them to put a simple converter circuit inside the box to deliver bi-polar power from a single negative ground power supply so you'd plug in negative and the pedal would still receive positive... but that would cut into their profit.

can someone link to a schematic of this?
now posting as Forrrest.
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Re: Problem with positive ground - PLEASE HELP!

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smallsnd/bigsnd
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Re: Problem with positive ground - PLEASE HELP!

Post by smallsnd/bigsnd »

simpler to use a charge pump converter:
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1017
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