Just got one of these because I wanted a 'normal doepfer' filter. Reviewing the thread to see which chips I may need to pre-stock, and I see most often it's the 4069 that blows, but sometimes the 5532 and even once or twice it was a 3080. That's every chip on the module, and the 3080's only go up in...

I built a VCO once. The frequency comes from some voodoo called an exponential converter. Whereby some input voltage to a transistor becomes an amount of current into an integrator area. I’m excited to have created a functioning VCO. Negative input voltage just doesn’t work or make sense in my topol...

Often the faceplate is "grounded" as in it's connected to the 0V reference. cheap/most VCO use the power rails as references, and touching it willpull the voltage. It's very unusual for the 0V to be impacted this way, it implies the system and your body are at different potentials. The case is not w...

I use IR mostly as a noise source for a snare. Just a quick envelope on it and you get nice harsh but tonal snaps. It also makes pretty pictures on a spectrogram or spectrum analyzer. Edit I should say as a kick drum too when turned low it makes glorious stomping. A kick, eh? I’ll have to try that....

I use IR mostly as a noise source for a snare. Just a quick envelope on it and you get nice harsh but tonal snaps.
It also makes pretty pictures on a spectrogram or spectrum analyzer.
Edit I should say as a kick drum too when turned low it makes glorious stomping.

It was a lot of fun for starters. I felt like I kind of outgrew it. The MB2 basically taught me synthesis, and I quickly wanted more control over the LFOs . It's been in a box for a while. The RB sold, replaced by bigger frames, and now there's no room on the desk for a semi-modular. The plain keyst...

Elahrairah, is this a microntroller-based circuit you're referring to that had those issues? I wouldn't call it a microcontroller. My clock uses a 555 to push a CD4013 and a CD4017 and a bunch of NPN gate buffers. The 555 goes to a switching jack normal, where you could input an external clock to u...

Scary soft to bend this back. I see how it could get lost.

thanks for linking that article by Matthew Skala. Very interesting. So this will be defnetly improved in a future version. But I would like to point out, that the current design is working fine, I had no issues so far. That’s the important part. Glad it works. I don’t have enough experience to real...

Six mill traces and a ton of 0603 components. I can’t build that. Eight mill power traces to the tl074, does that work for you?

I went the other way. A module with no Schmitt and some free space had weird behaviors when fed with a triangle wave clock. My clock divider had several circuits responding to different parts of the input in unexpected ways, including the led as you mentioned, it was not good behavior. Adding three ...

What are you trying to do with this? rCycle = rate+random(rate)-random(rate)+Pad[random(80)]; I would rearrange it so it appears more organized, then maybe your behavioral bug is more apparent. So I refactored your code. This should perform the same, I dont think I introduced any logic changes, but ...

So here's a question I totally didn't anticipate...not really power related at all but I've just discovered that none of the screws that have come with any of my modules fit into the nuts on this rack! They're all too big. Am I high or something? There are 3-4 different sizes of screw popular depen...

It's worth reaching out and asking the manufacturer. Called 'via in pad' technology, they can handle paste over a hole, somehow. I think JLC has got this as an optional feature, and maybe you don't need the hole to be in the solderpaste anyway. I like the idea of a dual footprint, KiCad should suppo...

Of the things that dont fit in the first two cases... I sold the ones that I thought other people would buy.

But now there's a large number of DIY stuff, like a VCA that looks like it was made by a kindergartener. What do I do with him?

You mentioned porting the Moffenzeef Muskrat and Dialup, and I got excited. Spent a day trying to get their Muskrat firmware running on an Arduino Nano with all the wrong internal parts. It almost works. So before making a module, I checked their usage license, and the dude said simply "Please don't...

I don't normally like multifunction modules, but I was about to start cloning the Dialup and Muskrat, so I'm very interested. Happy to beta test what you got.

Utilities! You've got a lot of heavy-hitters here but very little glue. Pick up an AISynthesis Matrix Mixer and try adding several CV sources together. You can get much more complex sounds out of your existing CV sources if you add two or three of them together. I'd look at routing and expression. D...

Quadrature Sine looks great.

I was missing a switch in a kit from them once a few years ago. All it took was an email and they sent it out immediately, no additional charge. They’ve been good to me. Perfect on several other orders. These days I would have a replacement switch spare but when I was a new kit builder I finished th...

So much love for Stages. I actually just got rid of mine, because the mind-share required to operate it didn't work for me musically. Loved the Metasonix RK2 VCA so much, I built three more as crappy knockoff clones. One VCA in 8HP ! And cheap utilities can always be duplicated. I went straight for ...

That first peak can also be caused by moist (speculating...) as we all know that moisture conducts electricity and when your synth warms up, the moist evaporates (magically disappears).... If there's two transistors performing the linear-to-exponential, they will push in different directions, and a...

So you said there are two of those, and one had the AC reversed?

And that led to a ground potential difference? That's not what I would expect. Makes me want to build same and test it...