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The Sweep waveform is a hyperbolic sinewave. It looks like this: The breadboard has a trimpot, but the schematic has fixed resistors. R51 & R52 provide the correct voltage to select this waveform. Other waveforms can be used, but this is the best match to the sweep used in the GP8.

A client asked me if I'd ever heard the Roland GP8's phase shifter section. I hadn't, but I found a schematic and breadboarded one. It bares some similarity to the MXR Phase 100 in that it contains both variable and fixed phase shift stages. The Phase 100 uses LDRs and has 10 stages; the GP8...

The Mu Amp does two beneficial things for us, compared to a simple one-transistor amplification stage. 1. More Gain! * 2. Nearly symmetric clipping. * HamishR increased R6 in his Mongrel pedal to moderate the 2nd stage gain.

That workbench is way too clean.

I like it! I think C10K would work better for BASS. BTW, Lectric-FX has already used the name "Mongrel" for a pedal.

There's a Vero layout. ☝️ Cooder designed a board. I don't know if Szukalski or any of the other usual suspects have done so.

Why not just buy low-HFE transistors? They are neither expensive nor hard to find. High-voltage, high current or high freq transistors all have reduced HFE because they are optimized for something other than HFE. 2N2369 is an example of a high-freq transistor. 2N6517 is a high-voltage...

Yep, the CMOS distortion stages are sandwiched between a compressor and expander.

Use the 0.5mA parts for Q1 & Q3, the 0.7mA parts for Q2 & Q4.

What does 1 .3 ma mean? is is 1.3mA or something else? Maybe it means one 0.3mA? Please try to be more clear.

Elsewhere in The Boneyard I describe how to measure Idss using a 9V supply, a DMM & a resistor.

You can thank The Orange Guy for that. Pray that his trip to China doesn't result in even higher tariffs.

I would have thought Golden Fleece to be the obvious pedal name for an ovinophile such as yourself. ;)

I remember a time when Tayda discounted the shipping for large $ orders. Did Tayda separate out the tariff costs? Or maybe they're rolled up in the shipping cost?

My personal policy is that the merchandise should cost more than shipping. I choose the quantities accordingly. My friendly neighborhood Electronics Store has 4000-series CMOS. I already bought all of the "good" CD 4049s & CD4069s. They have CD4007, but I already stocked up on a Mouser order.

That one will work. Mouser also carries them and offers a significant price break if you buy 10 or more.

Awesome!

Jumper all three lugs on the BODY switch and you can't miss. According to the board photo, we should lift the bottom end (closest to the LEVEL pot) of R18. Sometimes the board layout gets updated and the photo does not, so use a DMM to verify which end of R18 connects to GND and lift that end.

If Q1 was backwards, the bias would be so far off that I doubt any signal would get thru. Q4 might work backwards, but it would screw up the bias on Q3 big time. Also Q1 & Q4 would not be sensitive to the MIDS knob. Q5 would definitely have a problem if it was in backwards. The body diode...

So I swapped out the 2N2222A & 2N2219A for a pair of BC337-25 (HFE around 400), adjusted the bias and it sounds much better. The only mod I recommend is moving the pickup trim to the front panel, making it a 4-knob Fuzz Face. If you're interested in Yet Another Fuzz Face, this one is worth...