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In reading about/trying to learn more about tone stacks, I came across this: TI TL082 Datasheet: Under the "Typical Applications" section, page 12, Figure 28, it shows the circuit for "Three-Band Active Tone Control". Looks to me like the 3-band Baxandall tone control.

I may have made a bad assumption. I was presuming that you are currently using the NE555 for managing the footswitch logic and engage/bypass relay. So my thinking was that it would be minimally invasive to - loosely speaking - swap the NE555 for a microcontroller. But if the ESP32 is already...

To be clear, I was suggesting you add another microcontroller such as the ATtiny13a, and leave the ESP32 alone (i.e. ESP32 strictly for tuning, second microcontroller strictly for engage/bypass). The ATtiny13 is DIP-8 just like the NE5532. The supporting circuitry/components would have to...

Partially just out of curiosity. I haven’t been able to find any examples of single-transistor gain stages with bipolar supplies. But more specifically, I am thinking about integrating this circuit with another. The other circuit is opamp based, and benefits from a bipolar supply.

@Chuck D. Bones - is it possible to adapt to adapt a design like this to a bi-polar power supply? I.e., what if we have +/-9V supply available? Is that something that can be done with minimal tweaking, or does it require a significant redesign?

A couple other 3-band Baxandall EQ stacks in pedals: Catalinbread Silver Kiss, traced by Aion; Cornish CC-1/GC-1, also traced by Aion. In the latter, he also links to Elliot Sound Products Equalisers page, which is an additional general overview of common EQ types. Figure 7 on that page shows...

I did builds using 1590B and top-mount jacks for a while (see @MichaelW's excellent 1590B Top Mounted Jacks guide). But I got away from that, because if you want to use cables with right-angle connectors, they have to be the generally-more-expensive low-profile type. IOW, I found that the...

You could save about 20mA by using something other than the NE555 for the relay+footswitch logic. One way is with a simple microcontroller such as the ATtiny13a: you can have it go into a deep sleep state when not responding to switch presses (here's how I did it), where the power consumption...

Emphasis mine. What makes the JHS successful and the EQ a failure? (For reference: PedalPCB Van Pelt Drive is JHS Charlie Brown v4, and PedalPCB Chela Overdrive is EQD Talons.) Is it possible to easily "shift" a Baxandall tone stack? What I mean is, say the sweep for a frequency is -15 dB to...

I recently posted a build report for my AionFX Cepheus. I kind of rambled on in that build report, but it turns out I really like it. The only thing I don't like is the mechanical 3PDT switching, as I've become a soft-touch snob. I have various bypass modules, but I'd need to do a custom...

Take a look at the schematic for Chuck's CMOS Overdrive. He has the CD4007 pin numbers on it. You can see how, for example, he's using pins 3, 6, and 10 as inputs (as @mckillacuddy suggested above); pins 2, 14, 11 go to supply voltage; etc. In terms of "converting" a CD4049/CD4069 design to...

As Robert said, there are dual- and single-inverter chips, but they are all in SMD format. I've searched, and can't find any through-hole versions with fewer than six inverters. Edit: clearly I overlooked the CD4007! If it makes you feel any better, the unused inverters, assuming they are...

Shhh, sometimes I point my client to this forum for reference! ;) Those knobs (Boss-style) on the green were specifically requested by him. In fact, he wants an oversized Rate knob so he can easily control it with his foot. I forgot to order the larger knob initially, so that's the last part...

As someone who's coming at this from a "weekend warrior"/pure hobbyist perspective, i.e. without any formal training in electronics, circuits like these are kind of a landmine: while it does appear to be a novel circuit, I think all the questionable design choices make it a poor study for...

Have you by chance measured the current draw when the effect is engaged? There’s a possibility it’s not battery friendly. I seem to recall reading somewhere - this is a very vague memory - that one potential solution for switching pop is to not switch so quickly. So if you’re still getting a...

This is in regards to the Median Compressor. I initially had a similar problem as @ninjagrips as described in this thread. I initially built my Median with some TO-92 2n5457s I had in my stash. But like ninjagrips, I could not get the S-G voltage anywhere near 1.875V. However, in this state...

Referring to the schematic for the Chauffeur Overdrive (Shnobel Tone Daily Driver). If I'm reading the schematic correctly, this circuit uses a 7660SCPAZ charge pump to generate a negative power rail. And then all the RC4558 opamps are powered with a bipolar supply. So far so good. Assuming...

I like everything about this build! DIY PCB, shielded input/output wires, kickass custom graphics, clean overall build, fun-to-read writeup! More please!

Just an update. I don't have this process fully fool-proof yet. I used the new glue on two more enclosures, see attached photo. For the pink enclosure, I got most of the image to transfer. But you can see bits of the border didn't transfer, and some of the button labels. For the green...

Thanks again for all the help and suggestions! He ended up going with the Aion Emerald / Boss PH-1R. I just finished the client's build, and built a second for myself. Build report here. Thanks again everyone!