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Sometimes I see 10pF represented by the code 10, and other times I see it represented by the code 100 … same with 20pF, sometimes 20, other times 200. Which is it or are both correct?

Hi, I’m putting together an Octagon which calls for an L78L33. Is there a good substitute for that part?

Is the Arachnid a different circuit from the Octagon?

I see. It’s not really a transistor. It just looks like one,… looks a lot like one. It actually has transistors inside it. People refer to it as a transistor in casual conversation (not confusing at all, haha), but really it is a regulator that ensures a steady 5v gets through. Looks like in...

Is the L78L05 an NPN or PNP transistor? I believe it is an NPN. I thought a quick Google search would clear it up but I got confusing mixed results from AI (see attached screenshots).

I ended up with R4 at 20k which turned out to be just right for my ears in terms of unity gain. The video is an exact representation of the volume change from pedal OFF to pedal ON. Even if technically there is a tiny boost happening, that’s ok in my mind because reverb sets the signal back in...

Just a follow-up. All is well. Finished the build. This is a video showing how it turned out.

I’m amazed at how people are able to scan an entire build and spot things so quickly. I’ve been doing this under a year and have a long way to go, but hope to get good at this stuff with more practice and time.

Oh wow. Good eye! I’ll swap that out. Thanks!

The 470n caps I’m using are large but I’ve shaped the legs to fit the board. I’m still new to schematics so wondering if these can affect volume/unity gain.

Stared a new thread. I was going to do that but wasn’t sure which was better … to start a new thread or add on where a similar issue was already being talked about.

I built the spirit box Pcb and noticed a drastic volume drop when the pedal is on. In other words, I need more volume to achieve unity gain. I’ve been reading that the best approach is to increase the resistance value of R4. I started out with 10k. I tried 18k, 20k, 47k, and 68k. The higher I go...

I built the spirit box Pcb and noticed a drastic volume drop when the pedal is on. In other words, I need more volume to achieve unity gain. I’ve been reading that the best approach is to increase the resistance value of R4. I started out with 10k. I tried 18k, 20k, 47k, and 68k. The higher I go...

I have this question about wiring up a breadboard. It was too long to type, so I put it in this YouTube video:

Thank you! I appreciate the response. I may get one of those FV-1 adapters for experimenting / breadboarding.

I just have a few FV-1 questions. 1. Is it possible to feed a signal into two modes without needing 2 FV-1 chips on the board? (For example, can I send spring reverb into a shimmer and hear both at once?) 2. I’m noticing FV-1 chips cost much more than PT2399s. They are like $15-$20 each. Is...

In a guitar pedal circuit that calls for a TL702, do you happen to know if they are interchangeable? And if so, does the sound get altered drastically or only slightly?

Something I’m confused about with the TL072 is all the different versions. (TL072CP, TL072BCP, TL072ACP) What are the differences?

Is WIMA just a brand name thing or do they sound better & last longer?