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R2 is correct. Out of frustration I reversed Q1 and got a good signal through the transformer to Q4. I did the same to all the blue J201s and get signal to the output. The tone pot, color switch, and tone footswitch have no effect. I'm guessing it's a coincidence and need to verify the rest...

I swapped the breakout boards. The signal drops to almost inaudible after C1. I checked values to that point and are ok.

I receive orders to Frederick, MD in less than a week. via DHL

Thank you. I knew it had to be something obvious.

Put this together today but having an issue. When powered on and engaged I get a loud hum. It sounded like an errant ground somewhere. I tested the input by testing with my meter and it is connected to ground. Can't seem to see a reason for it unless I'm missing something obvious. I...

I also check the build documents before buying a PCB to see how difficult it may be to source some of the parts. If it’s unoptanium or expensive I’ll pass.

Thanks Robert. I was also most likely using a space before the number.

That has never worked before until just now. Thanks!

Is there anyway to look up the name of a pcb by the number on the bottom of the board? I have a few abandoned projects from years ago I may try to resurrect.

I still order from Tayda. I can get almost everything from one place. But the orders are large. I order at least 20 resistors of one value at a time and it it’s a commonly used value then 50. Some of the places me tioned are quite expensive. Tayda orders take less than a week to reach...

The range master is first in the chain. I started part verification and for whatever reason I had put a 68K resistor where a 2.2M should go. Works fine now. I have not yet been able to get a decent Sabbath sound. Just a generic distortion machine so far. Needs a bit more fiddling and try...

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I built this last year but does not look as good. I can't believe I got it to work.

Sabbatical Deluxe. Combination Sabbra Cadabra and Range Master. The rnage master side works and the Sabbra side passes a signal with no distortion the low resolution build doc makes it almost impossible to figure what parts are what. Both the schematic and the board layout. Never, ever again.

Just bought a Chaos Drive at the Baltimore Pedal Show. Sound fantastic through both my amps playing a Silver Sky. Les Paul is next.

Ic1. The pedal still does not sound that good as there must be other issues I haven't looked for yet.

Actually, at the end, AI had the only solution that removed the buzzing. It was a long road that also showed its limitations. It can analyze small snippets of a circuit rarely wellbeing not the whole thing.

Thanks. It's worst with a guitar. A test tone isn't too bad. I'll give the 100u a try. The buzzing stopped with the .1 cap from pin 3 to ground. I'm not thrilled with the sound so making some changes can't hurt. Just a note, chatgpt kept referring to VREF all along and once I asked the...

Yes of course, but is was an obvious and easy thing to check. The signal on one end of C12 was fine but on the other it went bad. No change. ChatGPT then wanted to look at the voltage section and zeroed in on C6, the 470u cap. It suggested changing it out which did not work. Then it...

I'm pretty sure that may be the case. I uploaded the entire schematic yesterday and it's analysis made no sense as it had connections between parts at opposite ends of the schematic. I do agree with it that the problem may be centered on C12, 2u2 cap. I still need to switch it out.