If I put my notes here, I might be able to find them again later!
"Activator 2" FET preamp for .. guitars and basses?
I have been doing a web-dredge, searching for simple, single supply, transistor buffer/gain stages, preferably FET-based.
This one seems interesting.
The designer, Henry Nurdin, has kindly posted a full schematic.
Ignore the fact for a moment that it's designed as a tiny battery-operated module to retrofit into electric guitars, the basic circuit block with 5-6 dB non-inverting gain could be used as a front end for a headphone buffer stage like, I'm thinking especially, the Szekeres MOSFET buffer.
That's if the bandwidth is sufficient for high-end audio (should be!?) and, slightly more worrisome, acceptable gain matching between channels can be achieved without resorting to trim pots.
This circuit reminds me of something. ... Sziklai pair? Time to do some more dredging...
Ah, bingo!
Update:
And with some jiggery-pockery this is taking shape as a (yet another) headphone amplifier.
This one seems interesting.
The designer, Henry Nurdin, has kindly posted a full schematic.
Ignore the fact for a moment that it's designed as a tiny battery-operated module to retrofit into electric guitars, the basic circuit block with 5-6 dB non-inverting gain could be used as a front end for a headphone buffer stage like, I'm thinking especially, the Szekeres MOSFET buffer.
That's if the bandwidth is sufficient for high-end audio (should be!?) and, slightly more worrisome, acceptable gain matching between channels can be achieved without resorting to trim pots.
This circuit reminds me of something. ... Sziklai pair? Time to do some more dredging...
Ah, bingo!
Update:
And with some jiggery-pockery this is taking shape as a (yet another) headphone amplifier.
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