Rangemaster and Electra distortion grounding

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
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Rjcastro76
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Post by Rjcastro76 »

I am planning to build multiple circuits, pnp and npn in one metal enclosure, each with its own input and output jacks, each with separate power supplies. Will positive grounds and negative grounds , those from the output jacks making contact with the enclosure be a problem?

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Nocentelli
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Post by Nocentelli »

You would be better off powering them all from the same "negative ground/positive power" DC supply, but use a voltage inverter on a daughterboard for the pnp "positive ground/negative power" circuit.
modman wrote: Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...

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BJF
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Post by BJF »

Hi,

You could also convert all to the same polarity as in all NPN or all PNP.....
But you could power all from the same supply while you will have to decide which pole is ground-for AC signals both B+ and chassi are the same point;) meaning that both become AC ground. All you need to do to combine PNP and NPN from same supply is to keep track of the currents needed for them to work and then just decide which pole should be common chassis ground - it helps hum if you build a b-tree and voltages at each tap are easily computed with Kirshoff's laws

Have fun
BJ

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