Still a geek, no matter how hard I try...
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- There a nifty almost true bypass switch that involved a DPDT and an LED + jfet and pull up resistor. I think Randall Aiken pioneered the circuit but I'm not sure who came up with it originally.
Incidentally the various saturated mosfet drive pedals that you can build are FABULOUS.Jan 4, 2013
- That "almost true bypass" I think you're talking about would be one of R.G. Keen's "Millenium" bypass variations referenced in footnote 4 of my post. :-)
MXR uses it all the time in newer pedals and reissues (apparently a result of hiring Jorge Tripps). But there's no "almost"; it is true bypass. I'm still building up my electronics knowledge, though, so I don't totally grok how it works.
As for building pedals...trying to avoid that addiction for now. Were I to start, I'd probably start with a FF clone. But it's interesting; the only MOSFET drive pedal I'm really aware of is the Fulldrive. A lot of 'em seem to be opamp-based; even the Micro Amp has an opamp in it.
Also, I'm mainly experimenting with my Fuzz Face -> Micro Amp -> TS-9 -> amp overdrive chain these days. The Micro Amp pushing the amp input by itself goes a really long way, and I dig the tones I can get putting it after fuzz and before OD. It really gives a nice little "push over the cliff". If Nigel Tufnel had a Micro Amp--and I'm shocked he didn't--he needn't have modded his Marshalls to go to eleven! :-PJan 4, 2013
- Yep, that's the one. I usually just ponied up for a 3PDT switch from Mouser.Jan 4, 2013
- Matt, I went back and read some more; I think the "almost" true bypass scheme you were thinking of is Keen's "Clinton" bypass, which he describes in that same link.
And I think I understand how the actual true-bypass Millenium works now; correct me if I'm wrong, but both versions of the Millenium use the very small reverse-current leakage of a diode to control the transistor switching the LED circuit open/closed. When the effect is disengaged, this tiny leakage is pulled to ground by the effect output itself, opening the transistor gate and breaking the LED circuit. Does that sound like a reasonably correct high-level interpretation?Jan 5, 2013