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I saw that too, I'm guessing the IB1209S called out in text makes up the "bridge" between the top and bottom portions. A quick web search said that is a DC-DC isolation device. To @djmiyta, sounds like you already bought the 12v power supply. But you might consider adding a 5v USB-C power...

I just placed my biggest (in terms of dollars spent) order at JLC, and even though the tariffs aren't 100%, the net effect is that my order cost was literally doubled due to an avalanche of extra costs. It looks like the cheap shipping option, the "Global Standard Direct Line" is only available...

If indeed the T and R footswitches are SPST momentary (i.e. they are open- or closed-circuit normally, and then closed/opened only as long as the switch is actually pressed), then yes, that exactly matches what I laid out in my previous post. As for buffer pre- or post-split. We're starting to...

Broadly speaking, the "bad" spot for a buffer is when the next device in the chain has a low input impedance that you want to exploit deliberately. Vintage fuzz pedals are the standard example: they have a relatively low input impedance, meaning they load guitar pickups; the result is that they...

Sorry if you read my first version of this reply - I had a major brain-fart. This is a re-write which is hopefully accurate! Trying to follow your intent, the way your schematic is drawn now, I believe the truth table would be as follows. I am assuming that S1 and S3 always operate in tandem...

You could try a linear ("B") taper pot for volume. The maximum available volume won't change, but unity should be before noon on the pot. Note that I haven't done this! But also - in boost mode, a linear taper pot might make the volume control too sensitive. But if you predominantly use the...

This is indeed typical for Bluesbreaker-derived circuits. Some BB-derived circuits add an extra boost stage at the end, for example the JHS Morning Glory (PPCB Glory Hole) or Snouse Black Box (PPCB Pot and Kettle).

I use essentially the same scheme as what @jubal81 posted in this "quasi-IC" module. I posted the schematic in a similar DIYStompBoxes thread. Schematic attached to this post as well. After I posted to DIYSB, RG Keen replied and suggested I consider making it a single-in-line package, using...

Small PCB plus only one knob demands a 1590B build! :)

Great build! And having recently done my first 1590A build, I understand the mechanical/fitment challenges. So extra props to you!

Great build, thanks for sharing! ...but we need gutshots :)

I hadn’t thought of that… but now I can’t un-hear it!

Sure! It's truly just a little bit - it's basically R11 and C15. C19 at the input also provides a little filtering too.

Here's my submission for most boring build of 2026: an always-on unity gain buffer. It's... delightfully unremarkable! The opamp is an opa1678. Since that's a dual opamp, it's basically a double-buffer with a little bit of high-frequency filtering between active stages. (And the opa1678 has...

Not for through-hole builds. I have a lighted, magnifying headset that I sometimes used when hand-soldering SMD parts. I've also used it for debugging a few times. Although, for debugging, I've found that my phone's camera zoom is actually the best "magnifying glass" I have.

How does this Royal Blue compare to your Bee Sting/Silver Bee? I've been on the fence about trying out the Royal Blue for a while now.

That's just all kinds of awesome! Super clean, I'd call that reference-quality work. Just beautiful.

So I finally had this design fabricated - and it works! Here's a build report where I used it. I actually ended up changing the design considerably from what I initially posted. The overall concept is the same. But the main difference is that I decided to use a microcontroller for switch...

I finally realized the Buffered bypass "quasi-IC" module I've been working on for a while now. This "Dynamic Haircut v2.0" was designed to be the first victim of the module. But of course the success wasn't realized without a comedy of errors. The long-term goal for the quasi-IC is to have...

R13 and C12 make up the bass filter in the final gain stage. I've built the PedalPCB Sliver, which isn't a Direct Drive, but shares a very similar topology. See the schematic in the build doc. At least with the Sliver circuit, to me, the bass trimpot doesn't offer a huge adjustment. It's...