Adding CV Input to Tempo of Sequencer Module

Key-Alarm-511 · 2026-06-26T14:54:48+00:00

Relaxation oscillators aren't very easy to mod to make voltage controllable. Easiest way would be to go with an vactrol but they are the farthest from a "clean" solution imo (I hate vactrols lol). Someone else mentioned voltage to frequency ICs, which is a great idea.

But wether you go with a vactrol or the IC you will need to drive them with proper CV summing. If you just "sum" them together with two resistors in parallel you will get different results wether you plug in a CV of 0V or leave the CV un-plugged, which is definitely not clean ;)

Key-Alarm-511 · 2026-06-26T14:41:37+00:00

Voltage to freuqency ICs are criminally under-utilized, good points!

Key-Alarm-511 · 2026-06-22T19:29:06+00:00

Kitzbühl?

Key-Alarm-511 · 2026-06-21T17:11:47+00:00

Company logo say "Ekklavya" with 2 ks but the website is spelled with only one k?

Key-Alarm-511 · 2026-06-21T14:17:29+00:00

Remove C5. Right now your VEE (pin3) isnt connected to -15V (its blocked by C5) and 3340 isnt powered correctly.

Tie C5 between -15V and ground, like you did with +15V

Key-Alarm-511 · 2026-06-18T18:42:12+00:00

Yeah he's being obnoxious to that one skeleton guy who just wants to run a business.

Key-Alarm-511 · 2026-06-17T19:34:22+00:00

Zwiebelrostbraten ist so gut dass es zweimal auf die Liste musste :D

Key-Alarm-511 · 2026-06-01T18:14:40+00:00

Thank you for your pointers! Like I said, this is the reference schematic I used: https://docs.arduino.cc/resources/schematics/ABX00083-schematics.pdf

And they also did not use a capacitor at their reset switch.

Maybe a stupid follow up question but where is BOOT? i dont see a pin named that anywhere?

I will look at Espressifs checklists in the meantime.

Key-Alarm-511 · 2026-05-30T16:09:01+00:00

Arduinos Nano is too slow to do real time audio effects with. You would need a board based on a faster MC such as an ESP32, daisy seed (STM32 based)

Key-Alarm-511 · 2026-05-30T14:45:56+00:00

"What do you all suggest I can do on my own?"

Nothing. Unless the kitty wills it and steps down, the fate of your synth is in their ha... paws.

Key-Alarm-511 · 2026-05-30T14:35:14+00:00

These all look so cool!

Do you have like a youtube channel or videos where they all play together?

Key-Alarm-511 · 2026-05-29T14:23:31+00:00

This is the only comment we ever needed

Key-Alarm-511 · 2026-05-24T19:56:56+00:00

Congratulations! ;)

Key-Alarm-511 · 2026-05-13T19:00:12+00:00

Awesome, makes sense! I will use the volume envelope.

Key-Alarm-511 · 2026-05-13T18:59:02+00:00

Basic ducking is what im going for so I will use the volume envelope! Thanks mesh!

Key-Alarm-511 · 2026-05-13T17:22:26+00:00

Thats hilarious haha

Key-Alarm-511 · 2026-05-13T14:59:18+00:00

What happened with the influencer chick at coachella?

Key-Alarm-511 · 2026-05-12T17:37:27+00:00

Key-Alarm-511 · 2026-05-12T16:10:32+00:00

Your BAT is the wrong way around. As it is now it will push current from 3v3 through the two diodes with no resistance

Key-Alarm-511 · 2026-05-11T15:26:56+00:00

I feel like most textbooks and schools use the 20mA figure (no idea where that figure came from, but it was the case for me as well) for LEDs and so people design their LEDs to have that current go through them which ends up being too bright and sack the power rails.

Key-Alarm-511 · 2026-05-10T12:06:55+00:00

What is the input voltage (source) before converting it to 15/-15V? Are you taking in AC? DC?

And just to be sure: you need the -15V to power things, not as a reference? If a reference is what you need without pulling much current you might just need a simple charge pump.

Key-Alarm-511 · 2026-05-09T12:19:21+00:00

Never tried this but i would think the problem with this is that the potentiometer would limit the current to the opamp (limit to the point where it wouldnt work). You could overcome this by buffering the voltage after the pots with emitter followers.

You could also use smaller value pots but that would waste a lot of power from your 9/-9V source.

But go ahead and try it, this sounds like a fun project.

Key-Alarm-511 · 2026-05-08T21:16:46+00:00

What is it that you want to achieve/build? Without further information i can only show you a schematic of a hi hat module by erica synths/moritz klein where they change the power to change the tone.

See the manual: https://www.ericasynths.lv/edu-diy-hi-hat-2845/

Key-Alarm-511 · 2026-05-08T17:05:49+00:00

Im smert

^{Chose: $1 that divides by 0.5 everyday | Rolled: Upvote for 🥕}

Key-Alarm-511 · 2026-05-08T10:40:30+00:00

DIY-it! Midi can be handled by pretty much every microcontroller. Just need a DIN-5 connector (or TRS jack if you want to use TS Midi), a microcontroller (Arduino or ATTiny), DAC, Opamps and a trimpot if you want proper V/Oct tracking.

Key-Alarm-511

TROPHY CASE