Recent content by jwin615

It can be done, but can I ask why? Not sure you'll gain a ton vs the biasing issues you may have. I.e., the bias setting that's best for one transistor may not match the next. For Si, this is much less of a problem but for Ge, it could be a big issue. If you find 2 germs that sound good...

Lovely build! Great to see some Beautiful Bean FootageTM around here. He's got a bunch of restocks up in the store btw.

Sounds like something may be shorting/bridged or maybe something is off with vref. Check the voltage divider out of vref R102/R103

That's a big 47p in C3. Sure if 47pf?

Pics

Either up the value of R24 or jump a resistor from one side of R24 to ground, maybe at D2, to bleed some signal to ground. You could also use a trimmer to match levels more accurately.

Maybe a crappy 1u electrolytic, C16/C17. But also, PT2399 alias noise... I'm assuming your friend is a guitarist and likely just noticed this due to any combination of hearing damage, brain damage, illicit behaviors, or he didn't use it for 2 years. You can cycle through some 2399s. Some are...

Ah. Using optos and/or digi pots I guess? Wire a pot to a switch to a trs jack and find out. I don't think you'll get momentary action though if moving the pot on the pedal is a requirement.

Bmy guess is the trs ex jack is switching. You could toggle it between two settings via footswitch but I don't think you could toggle between "new circuit" and pedal settings because the switching jack overrides the pedal

Take a look at the madbean anamorph as well. Brian/bean did a great job with this amalgamation of analog delay circuits. Here's @Guardians of the analog 's excellent demo:

No. To be a viable product, i.e. used outside the pedal world, the transistors should be matched. Though it's probably possible to manufacture, there's really no demand. The biggest use case was class AB audio output, where you need the transistors separate for heat sinking. For small signals...

This is the way. Also, way fewer troubleshooting threads on the skoolie.(No dis to scruffie. Just a lot of struggles)

https://madbeanpedals.com/projects/index.html

TI bought BB 25 years ago

No idea just looking at an bay photo. They don't look obviously fake, but they do look more expensive than mouser.