Recent content by phi1

A lot of it comes down to: -high frequencies go right through a capacitor, almost as if it was a short. -low frequencies see a capacitor as a high resistance. The larger the capacitor, the lower the frequencies it “lets through”. In a non inverting op amp, the gain is set by: G = 1 + R2/R1...

Love to see the mods and the creativity!

Pt2399 is run off a 5v power supply, so with a hot enough signal it could clip. I know I’ve had a Belton brick reverb clip on me (which is built out of pt2399s). On any of the pt2399 circuits like the seabed or magnetron, you can reduce gain before the pt2399 and recover the volume after...

Lots of nice articles on this site. https://www.coda-effects.com/2018/08/the-different-types-of-diodes.html For more lows, you could increase C4. (Also described in the Wampler article MOD 3). Reading the electro-smash tube screamer article several times can go a long way.

Old article, but still a fun read. Mod 4 (transparent tone control) looks cool. https://www.premierguitar.com/gear/5-diy-mods-to-perfect-your-ibanez-ts9-and-boss-sd-1

When mixing 2 signals, you should use mixing resistors. The fuzz output (from Vol-2) doesn’t have one. It might work ok since you have the resistance from Vol-3 to Vol-2. One concern would be if you have the fuzz volume relatively low, you’ll dump more clean signal to ground through Vol-2 to...

Not exactly the same, but similar concept, some delay pedals tap the output and run the feedback back into one of the inputs. (Example: Deflector) Can confirm the above, you can operate the inputs and outputs totally independent within the same program code, limited to 128 instructions total.

2nd ^. Awesome looking & sounding pedal. Is that the white hammer enclosure? Not sure if you did yet, I'd solder the transistors into the sockets so they don't fall out long term.

So your microcontroller is sending an analog voltage (0-3.3v) to the FV-1 (one of the pot inputs) to set the tempo? Are you trying to use the source code I posted as is? That code reads pot2 > 0.8 as a footswitch press. So, you could read the switch in your microcontroller, then send 3.3V...

Wow awesome job and thanks for sharing the gerber. I built one several years back and liked it, but let it go, might have to build up another. Looks really good. Maybe you figured by now, whenever pedal circuits use SPST, usually they just use an SPDT and don’t connect one of the lugs

you won’t have much gain. Bring R4 down a lot, like 10k or even lower. Experiment with C3 for the bass cut, probably in the 22n to 100n range depending on what R you use. The BM tone circuit cuts a lot of volume. You may find you want an extra gains stage, either op amp (since you have an...

You aren’t cutting any bass before clipping. This can sound flubby and mushy. (Although you might find something you like). Many pedals cut bass by reducing C3. Cutoff frequency = 1/(2piRC). Where R is R5 plus RV1. Since RV1 is changing, it’s not an ideal spot to control the frequency. You...

That’s a nice idea. I wouldn’t know how to make the circuit for the 555. For this specific project I don’t mind helping with the attiny. But yeah would be nice to make it easier to use

Here's the layout drawn in DIYLC in case anyone in the future wants to see the idea.

Schematic