Adding a +V-powered buffer to a -V pedal (PNP fuzz)

Started by aion, August 25, 2019, 06:11:53 PM

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aion

I'm adding Jack Orman's transformer-based pickup simulator to the front of a Tonebender to allow it to be used later in the chain if desired. I'm also throwing a JFET on the front to fully isolate the impedance from anything earlier in the chain, as in the EQD Eruptor.

Schematic:



As you can see, I'm using an inverter to get -VA, so I already have both the positive and negative supplies handy. Will this cause any issues as drawn, or is it kosher since the two stages are capacitor-coupled and the AC signal is indifferent?

I've used the pickup sim with negative-ground pedals like the Woolly Mammoth and it works great, but just wanted to check before migrating it to positive-ground.

I realize I can probably set up the JFET to run on negative-ground like the rest of the circuit, but am also working on a different idea where I run both an NPN silicon and PNP germanium fuzz in parallel, so I would have to work through it eventually I guess.

PRR

R10 should be much less than 1Meg.

DC voltage on Source should not get to next stage.

More RPDs may pop less.

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aion

Yes, sorry, that was a mistake I forgot to correct - I had just duplicated the resistor part and missed the value. It's intended to be 4.7k!