This looks very promising. And easier to understand and build then Don's core.

Hello, long time lurker, first post here. I've had a quick email chat with Haralds:Werk and he doesnt want to answer individually, which anyone could understand. So here are my few silly questions (might have more later): At R10, is the tempco a PTC? What's OP's recommendations for ppm, series or t...

I just received a new Pamelas NEW Workout and it is quite unusable. The OLED display is barely visible and there is no adjustment for brightness. Is this a known issue? And anything else to do as sending it back for replacement? Sounds like you got a bad unit. I’d exchange it. It’s not the brightes...

EASYBOY wrote: ↑

Thu Feb 11, 2021 8:13 am

FIRE

this looks great.
If anybody is making a pcb please get in touch with me.

You can download the Gerbers for free and order them yourself. Or PM me.

This is my third take on the Trapezoid VCO core designed by Don Tillman. My first implementation for a 15V banana system with separate waveshaper can be found here . My second implementation for a 15V banana system with integrated waveshaper can be found here .This time I moved on to the 12V Eurorac...

Looks quite normal to me. Or my display is also "kaputt". Sorry to hear, it's hard to read for you. Because it is actually one hell of a module. I actually like the dimness, because it doesn't distract or even dazzle like other modules. I believe I saw a discussion somewhere, on how to DIY-replace ...

I just received a new Pamelas NEW Workout and it is quite unusable. The OLED display is barely visible and there is no adjustment for brightness. Is this a known issue? And anything else to do as sending it back for replacement? How bright your background lightning is? The display is quite dim. The...

I just received a new Pamelas NEW Workout and it is quite unusable. The OLED display is barely visible and there is no adjustment for brightness. Is this a known issue? And anything else to do as sending it back for replacement?

I have build something like this for a standalone device with +/-15V output. Look here as a starting point:
https://www.haraldswerk.de/PSU/PSU_Sing ... ouble.html
Completely analog.

Nice project. I even wanted to assembly it but my PCB manufacturer said that Gerber files are out of his specs - vias diameters are too small (0.4mm, should be 0.8mm) and tracks distances are too small (7 mils, sometimes 4 mils, should be at least 8 mils). I've even tried to import Gerber files int...

Maybe you can use my schematic as starting point:
https://www.haraldswerk.de/Utilities/Slew/Slew.html

roglok wrote: ↑

Mon Jan 18, 2021 4:24 pm

Harald, is it based on CMOS or microcontroller?

Completely CMOS.

Sequencer Nostalgia This was my first build when I came back to SDIY. A three row/16 step sequencer. Completely build on stripboard. Still working after all this years. Only hand sketched schematics. Nothing to publish. Pictures only. seq-ein.JPG img_0401.jpg img_0143.jpg img_0147.jpg img_0146.jpg

Yes, that's correct. The 1N4004 are fore protecting from false polarity from the PSU. You can leave them out if not needed. You can leave the ferite out as well. Just replace them with wires.

1WILDTHING wrote: ↑

Sun Jan 17, 2021 5:51 am

Hi there, I'm trying to build this module but I'm confused about how to wire switches.
Could you please give me some advices?

This is the Eurorack version of my NGF 36dB VCF . I have brought out the 6dB, 12dB, 18dB, 24dB, 30dB and 36dB poles. You have two audio inputs for easy mixing sound sources. And CV inputs for linear TM, log TM, envelope, V/Oct tracking and emphasis. The exponential circuit is temperature compensated...

Very nice!

Nice one! Harald reigns as the productivity champ here on Muffs diy! More to come. Still working on my publishing backlog. And some new stuff. I have a running prototype of a Quadrature trapezoid through zero LFO with all the usual wave forms at 90deg apart. And working on a scanning mixer and harm...

Heh, I had forgotten completely about overshoot. Thank you. As for the euro/banana distinction, I’m a banana person too, but is it the case that shielded cables present more difficult (more capacitive?) loads than single cable banana leads? The shielded cables have some capacitance. You can look at...

Just added the correct links in my first posts.

Nicely done as usual. Can I ask about the 5.6pF caps on some of the op amps please? Usually if I see those I think they are for stability but IC3A, 4A and 6A look like being the least likely to go unstable in the whole circuit. You don't have such caps on the output op amps for example. So I wonder...

This is an often used utility module. The mixer comes in handy for mixing CV sources. The mixer is DC coupled, so you can use it for DC and AC mixing. The input impedance is constant 1MOhm. The input signals are amplified by a factor of two. It is possible to offset every input with +/- 5V. The offs...

dot matrix madness wrote: ↑

Mon Jan 11, 2021 5:33 am

Nice to have a really working, simple AD/ADSR design.

Thank you. Here are some screenshots.

This is another derivation off the ADSR from my NGF_E project , adapted to 12V Euro-rack format. Because this one is a stand alone module I have removed all additional features from the Next Generation Formant project. Nonetheless it is still based on original Elektor Formant ADSR schematic. I made ...

Interesting! On my list of things to try one day are the specialised Burr Brown frequency to voltage IC's, as some of them are pretty accurate, but using a microcontroller is a lot more flexible, great idea! How does it work? Have you used it in a musical context? Yes, I am using it to steer my syn...