Works great, extra flammable. Be sure to only use it outside away form sources of ignition.

@@Recklessexperimentationaudio ---Thanks!

Look at vacuum tube circuits for inspiration. A triode tube and an NPN transistor do *generally* the same thing. Of course all the component values will be drastically different given your will be operating at 12-24VDC not 240VDC

Yes, and there is only one left recklessexperimentationaudio.com/products/lead-follower

Might want to try cleaning the flux off the perf board. Sometimes, on high impedance circuits, the flux residue can become slightly conductive. This can cause voltage leakage to different parts of the circuit. Fortunately the fix is easy.

I accidentally typed an 8 instead of a 7. That being said, for this application, I think the two chips would work the same.

Actually the TL082 works a little better for my eurorack V/oct modulation purposes. Thank you this circuit performs better than one that uses TL074 and JFET.

I think it would be an identical circuit on a +/- 15 volt supply. I generally use 10uf 25V caps for power filtering (+ or - power rail to ground), and 50V ceramic caps for everything else. The op-amps are good to 36V total supply voltage. Resistor values shouldn't need to change either.

Thank you so much@@Recklessexperimentationaudio . Makes perfect sense. Your schematic show you using a pair of 104s for power filtering (only needed on breadboard, not needed on a pcb?) and a 103 for your input to gnd reference. but what was the other capacitor you used to slow down the input to the 3904? A 20? C36.

@@danobrien3292 104 or 100nf cap are recommended to be placed as close to the chips as possible for best noise reduction. All the chips should get one on each power rail. The 20pf cap is to provide a pulse of current to the 3904 to capture the voltage sample. higher value longer sampling time, I found 20pf worked for me.

1. Alcohol vapors are flammable. 2. Ultrasonic cleaners, especially if the fluid level gets too low, tend to aerosolize some of the liquid, which then evaporates quickly forming vapor. (Think ultrasonic humidifiers.) 3. Ultrasonic cleaners normally heat the liquid, too. Hot alcohol evaporates way faster. 4. The sheer amount of alcohol needed to fill an ultrasonic cleaner big enough for even modest size boards is significant. 5. Standard ultrasonic cleaners use normal switches, timers, and thermostats that cause sparks when switching. This could ignite alcohol vapors. The upshot is that it’s a fire risk. They make special ultrasonic cleaners for use with solvents. But often it’s not necessary to use a full-alcohol bath anyway. One thing people do is to put the board into a small container or plastic bag and put alcohol inside the bag. Then you put the bag in the ultrasonic bath full of water. Not only is this far cheaper, it’s far safer. Another option is to use a bath composed of a blend of alcohol and water. The alcohol will still do its job, but the fire risk is reduced. (This is how windshield washer fluid works.) And finally, they make water-based cleaning products for circuit boards, specifically for use in ultrasonic cleaners.

Yeah, I'm not normally someone concerned over safety issues, but this just doesn't seem like a good idea. Flux off works just fine, and I've found Micro Care's cleaners to be even more effective still.

@@ElationProductions Ultrasonic is really good for getting flux out from hard to clean nooks, like under SMD parts, where you can’t get a brush in to scrub. But I wouldn’t fill a whole ultrasonic cleaner with solvent to do it! :P

Driving the motor with 5V yes. If you drove it with 12V or 24V you likely could get a much higher speed. Just make sure not to overheat the motor.

Here is the link: recklessexperimentationaudio.com/products/ilda-eurorack-interface-module1

@@Recklessexperimentationaudio Got it! thx

No, the pedal has to operate of a +9V supply, this module uses +-12V supply. However, the op-amp stages to do the effect are the same.

All the parts have been ordered for a run of modules. I will do an assembly video once everything comes in.

Awesome - keep us posted!@@Recklessexperimentationaudio

I have already started to layout the PCB, I hope to have an initial run of modules in January.

I absolutely do, I heave already started to layout of PCB. I will make I video/post when everything is ready.

It is called either "Masonite", "hard board", or HDF I get mine as 4 foot by 2 foot by 3/32 inch sheets at the Home Depot. Its the best for prototyping face-plates.

Sure, use the contact form on my website and I will send you a copy. recklessexperimentationaudio.com/contact

@@Recklessexperimentationaudio many thanks :D

I used 14AWG wire for everything. Almost the same as 2.5mm^2 in metric

On my unit there is a 100uf 25V capacitor near one end of the board, that is where I attached the power leads to my board. If it is affecting the sound, check the current draw of your board, I my board draws about 20mA. It is also possible that the filter caps are bad, and need to be replaced. If your unit is similar to mine, it is over 45 years old, and the caps don't last forever.

Thank you for sharing! You’re an inspiration!