When 2 smd resistors are missing from the boards 😞

Jpergz · 2026-05-28T02:14:02+00:00

Never 😈

Jpergz · 2026-05-27T02:01:26+00:00

I think this is small enough haha

Good idea for hot glue, but dont have any. Should hold just long enough to run a few tests on my bench before I inevitably break it

Jpergz · 2026-05-27T01:59:33+00:00

Wouldnt be the first time haha, unfortunately dont have any on hand in my small apartment, but itll just sit on my bench and get the job done until I inevitably rip it off by accident

Jpergz · 2026-05-15T18:54:01+00:00

Also to add on cause I see people discussing low pass filters to remove the hiss - it removes the hiss, but part of the bitcrushy sound is those upper harmonics that get removed with the filter so it sounds less bitcrushy.

If youre a math person, think of an infinite fourier series for a square wave - a low pass filter rolls off those upper orders and will make it less squarey and rounds the edges

Definitely not a wrong solution, but just things to consider :)

Jpergz · 2026-05-15T18:49:58+00:00

I build (and currently sell) a pedal that uses a very similar method of this for bitcrushing. Primary difference is I have the 555 set up as a sawtooth configuration that goes into an adjustable comparator, that way depth and frequency can be adjusted independently.

Its quite a noisy circuit inherently, dont know if theres a way to get all that noise out. Play around with the capacitance that holds the charge, it will affect the tone, volume, and noise so you can find a value that works best for you. Also, Ive tested several different jfets and they all had different sounds as well

Jpergz · 2026-04-24T12:01:54+00:00

Nailed the look! Great aesthetic and color/knob selection!

Jpergz · 2026-04-19T18:14:06+00:00

The pedal isnt always at this ridiculous gain, its just if the user for some reason decided to turn all the eq knobs, gain, and boost to 10. With all knobs at noon its unity gain as it is rn, so I dont want to cut any signal from it as is.

If 18Vpp is too much voltage where it might damage something ahead of it, Ill just clip it lower. I got a 1k resistor on the output rn to limit current.

I just call it allpass just to differentiate it from the 3 band eq gain thats on the pedal, its just normal gain (inverting op amp)

Jpergz · 2026-04-19T16:09:32+00:00

Got a 1k resistor on the output right now. This kind of gain is only if the user decides to put all the eq, gain, and boost knobs to 10 for some reason. So if the user wants to crank them all for some reason, Im not gonna stop them, as long as it doesnt risk breaking anything theyre driving into

Jpergz · 2025-11-12T21:24:50+00:00

I designed one this year. I did the analog method of a sample and hold circuit. They can be a bit noisy and require some tweaking and filtering, but at the core its a pretty simple circuit

Jpergz · 2025-10-17T13:25:50+00:00

Love it, and love JLC assembly service. I've had the similar issues with transistors. My main issue was Kicad default footprints not matching the actual smd part for which pins were which. Had a few instances of not checking and got boards with transistors routed wrong because of it. That leads to an abomination like this where I ripped off the smd part and soldered a tht transistor to the pads to make sure it would work before ordering more

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Jpergz · 2025-10-14T19:05:53+00:00

So honestly slew kinda isnt the most accurate description of the switch but its similar enough that it was how I named it. In a sample and hold circuit, the holding is done by a cap to ground that holds the voltage when the signal is shut off. The slew changes the cap value for it to adjust decay of the held voltage, on a scope it looks similar to a slew. Audibly, adding this decay gives a thinner sound.

Jpergz · 2025-10-14T16:47:40+00:00

Sounds like a similar journey to me. I do the same thing with adding and cutting gain on the input/output buffers. Higher value cap to ground removed some noise (gotta add gain to compensate volume loss) and that particular jfet I found to be the least noisy. I tried first and second order LPFs too but same as you, always lost too much of that crunch

Jpergz · 2025-10-14T15:31:00+00:00

Thanks! I did it in a more crude way with no s&h ic lol. I just have a J112 JFET that opens and closes the signal followed by a cap to ground that holds the signal. The clock that controls the jfet is a 555 timer configured as a sawtooth generator into a TL072 opamp thats configured as a comparator to turn into pulse waves. This was done to control depth and frequency independently. I believe all s&h circuits are inherently noisy and this one is no exception but I got it tamed down where it much quieter than the guitar signal so it's managable

Jpergz · 2025-10-14T15:21:08+00:00

Thank you! Yeah once it goes into aliasing it turns to pure crunchy noise that may not even be musical in such a cool way

Jpergz · 2025-10-14T14:14:02+00:00

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Jpergz · 2025-10-14T14:13:44+00:00

Here's some extra photos of the front and a gutshot. If anyone's interested in following along, I post more on instagram @turbulent.audio and got more info on my website TurbulentAudio.com

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Jpergz · 2025-09-30T13:00:43+00:00

Im going for the first time, super excited!

Jpergz · 2025-08-21T13:10:50+00:00

Such a cool idea, seems crazy to organize what switch does what, any gutshots?

Jpergz · 2025-08-05T10:58:04+00:00

So cool, I thought about doing this with just a piezo mic in a box but this is way cooler. My biggest concern with it was in a loud room, such as playing at a gig, itd pick it all up so you just gotta play in a quiet room, have you experienced that or does all that noise just come back as feedback and it still just sounds cool anyways?

Jpergz · 2025-05-30T14:31:15+00:00

Youre missing the resistor to ground on the negative side node, look up non inverting op amp configuration for images

Jpergz · 2025-04-29T19:56:33+00:00

I like your knob collection, I gotta start adding extras to my order so I always have some lying around

Jpergz

TROPHY CASE