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It feels like some treble is getting lost somewhere and it might be the buffer. I'm away from home for a few days, but when I get back I'll look into it.

No. Idss means Drain Current with Source Shorted (to gate). In other words, connect gate to source when measuring Idss.

9nA is about what I'd expect for a 1N4148

The original bias circuit was in Q2's feedback loop and affected both the bias and the gain. The bias circuit I implemented is outside the feedback loop and has much less influence over the gain.

TL074s would work great. Lotta different JFETs will work. Basically any JFET that would work in a Phase 90. Could use a charge pump to make the -9V rail, or run it on just +9V and make Vref, like a Phase 90.

The output impedance of Q2 is no more than a few hundred Ohms. A 56K resistor is no match for that. Are you sure it connects to the emitter?

Another pedal from my brother's garage. I vaguely recall my roomie Richard owning this back in the mid 70's. I modded it for him by adding a DEPTH knob. He later sold it to me, I loaned it to my brother and forgot about it. Until a couple of weeks ago when he brought it back. Back in the...

Bypassing Q2's emitter makes no sense to me. That's the feedback path. What do you think of this one?

A partial list of Canadian products subject to the new 50% tariff (no joke): marine buoys festive, carnival or other entertainment articles capes cloaks wigs (partial), false beards, eyebrows and the like, of synthetic textile materials This is going to ruin Halloween.

The FILTER knob goes + or -. At the minus end, we get a notch. This is with Q at 10, FREQ at 5, RANGE at LOW, FILTER at zero.

Another task for the queue.

It's been a loooooong time since I've cracked a textbook, and some of the ones I had in college were long on theory and short on practical applications. A mathematician and an engineer were both posed the following problem: A man and a woman start out 8m apart. Every 3 seconds, they cut the...

That's the genius of putting the OTA in the feedback loop.

Indeed, I had all but forgotten about this. Rebooting brain now...

It sounds like a vintage EM. Because that's basically what it is.

All cleaned up. The best I can do without repainting it. It now has proper true-bypass switching. I corrected the pre-emphasis / de-emphasis circuitry, added one resistor and moved one capacitor. Like the Electric Mistress, it's a very minimalist Flanger; not much in the way of...

1973, that explains the questionable fashion sense. I'll bet they're all wearing platform shoes.

Are you sure? I think the guy on the right looks like Billy Joe Armstrong.

Can you name this group? A. Black Sabbath B. Blue Oyster Cult C. Deep Purple D. Green Day E. Pink Floyd F. Simply Red G. The White Stripes

I have it all traced out. It's pretty close to the Electric Mistress V2 shown in post #1. As I was drawing up the schematic, I noticed that I had screwed up the pre-emphasis / de-emphasis networks. Easily fixed by changing a few component values. I'm also going to swap out the SPEED pot for...