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Bixonic could make the same claim. "ZZTop special: an Expandora 6-pack."

A couple hundred millivolts. Not enough to make a difference. It's clever and all, I'm not knocking it. Other builders do it.

I'll take one! Please & Thank You.

NIIIIICE! But are you sure the power wires are thick enough? ;)

When you say "line noise" are you referring to 60Hz hum? 7:00 is full counterclockwise. Potentiometers need to have their bodies grounded to minimize hum and stray coupling. I'm guessing that yours are floating in the air. If so, try soldering a wire to the pot shell and ground the other end...

2N7000 & BS170 are the ones I use. Any MOSFET with Vth<5V and Rds,on<10Ω will work. When swapping parts, mind the pinout.

It could be and probably not in a good way. With a MOSFET you can never overdrive the gate. At audio frequencies, the gate current is essentially zero no matter how hard you drive the gate. with a JFET, it you raise the gate voltage above the source voltage, then the gate is forward-biased...

They say sex is like playing Bridge. If you don't have a good partner, you'd better have a good hand.

From the pages of the New York Times: A tragic fact about bosses is that many of them have never built up a natural immune defense to “stupid ideas.”

correct. With the power off, C5 & C6 are discharged, i.e. the voltage across each of them is zero. When the power comes on, C5 hold U2-9 is at zero volts. This forces pins 8 & 11 high and therefore pin 10 low. U2-10 low keeps C5 discharged. C6 charges thru R5 and after 50ms or so is ready to...

MOSFETs & JFETs have the same transfer function. Where did that schematic come from? I'm not seeing the advantage of a power JFET over a power MOSFET in this application.

Both circuits bias Q1 at around 5V. The v1.2 circuit biases Q1 a little colder than the stock circuit. Easily adjusted by changing R6 or R7. The symmetry of the voltage divider (R6 = R7) is not important because there are voltage drops in R3, R6 & R7 that depend on the resistance and Q1's...

Ever wonder why we don't see any choke-loaded high power SE amplifiers? Because you'd need forklift to move it.

The "linear" region is between cutoff, where Ic approaches zero, and saturation, where Vce approaches zero. I put the word linear in quotation marks because BJTs are not all that linear on their own. We use feedback and/or biasing to maximize linearity if we want clean amplification. Or we can...

I'd use 10Ω for the relay power. 100μF + 100nF is good for relay filtering. If you have a high quality power supply, like a Voodoo Labs, then you can forgo the 10Ω resistor. I like to have a little bit of series resistance in case I plug into a lesser power source.

Try a 10K pot in series with R9. I haven't tried it, so I can't vouch for how it sounds.

Hmmmmmmm.

Got a link?

R101 is too large for the amount of relay current you'll have. I recommend providing a separate filtered power rail for the relay so that changes in relay coil current don't bounce the pedal's Vcc.

I was aware of the technology, but have not investigated it. A quick scan of the datasheet tells me that these are intended for power conversion applications where they are used as switches. They can be operated in linear mode and the gain (transconductance) is HUGE. Orders of magnitude...