Search found 352 matches

by Haralds:Werk
Mon Feb 22, 2021 2:17 am
Forum: Music Tech DIY
Topic: A quadrature triangle VCO
Replies: 41
Views: 606

Re: A quadrature triangle VCO

This looks very promising. And easier to understand and build then Don's core.
by Haralds:Werk
Sun Feb 21, 2021 6:17 am
Forum: Music Tech DIY
Topic: Trapezoid quadrature through zero VCO (Euro version) with waveshapers
Replies: 7
Views: 350

Re: Trapezoid quadrature through zero VCO (Euro version) with waveshapers

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...
by Haralds:Werk
Fri Feb 12, 2021 11:16 am
Forum: Eurorack Modules
Topic: Announcing ALM017 - Pamela's NEW Workout
Replies: 2067
Views: 165011

Re: Announcing ALM017 - Pamela's NEW Workout

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...
by Haralds:Werk
Thu Feb 11, 2021 8:30 am
Forum: Music Tech DIY
Topic: Trapezoid quadrature through zero VCO (Euro version) with waveshapers
Replies: 7
Views: 350

Re: Trapezoid quadrature through zero VCO (Euro version) with waveshapers

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.
by Haralds:Werk
Thu Feb 11, 2021 8:01 am
Forum: Music Tech DIY
Topic: Trapezoid quadrature through zero VCO (Euro version) with waveshapers
Replies: 7
Views: 350

Trapezoid quadrature through zero VCO (Euro version) with waveshapers

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...
by Haralds:Werk
Wed Feb 10, 2021 10:44 am
Forum: Eurorack Modules
Topic: Announcing ALM017 - Pamela's NEW Workout
Replies: 2067
Views: 165011

Re: Announcing ALM017 - Pamela's NEW Workout

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 ...
by Haralds:Werk
Wed Feb 10, 2021 8:59 am
Forum: Eurorack Modules
Topic: Announcing ALM017 - Pamela's NEW Workout
Replies: 2067
Views: 165011

Re: Announcing ALM017 - Pamela's NEW Workout

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...
by Haralds:Werk
Wed Feb 10, 2021 5:37 am
Forum: Eurorack Modules
Topic: Announcing ALM017 - Pamela's NEW Workout
Replies: 2067
Views: 165011

Re: Announcing ALM017 - Pamela's NEW Workout

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?
by Haralds:Werk
Fri Feb 05, 2021 6:06 am
Forum: Music Tech DIY
Topic: What's the 'best' way to get bipolar power from a wall-wart?
Replies: 88
Views: 1452

Re: What's the 'best' way to get bipolar power from a wall-wart?

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.
by Haralds:Werk
Sun Jan 31, 2021 3:23 am
Forum: Music Tech DIY
Topic: 6..36dB VCF Lowpass/Highpass
Replies: 6
Views: 304

Re: 6..36dB VCF Lowpass/Highpass

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...
by Haralds:Werk
Wed Jan 20, 2021 2:48 pm
Forum: Music Tech DIY
Topic: Variable Attack/Release Slew
Replies: 6
Views: 214

Re: Variable Attack/Release Slew

Maybe you can use my schematic as starting point:
https://www.haraldswerk.de/Utilities/Slew/Slew.html
by Haralds:Werk
Tue Jan 19, 2021 2:36 am
Forum: Music Tech DIY
Topic: The 2021 Show Us Your DIY Builds Thread!
Replies: 114
Views: 5590

Re: The 2021 Show Us Your DIY Builds Thread!

roglok wrote:
Mon Jan 18, 2021 4:24 pm
Harald, is it based on CMOS or microcontroller?
Completely CMOS.
by Haralds:Werk
Mon Jan 18, 2021 9:34 am
Forum: Music Tech DIY
Topic: The 2021 Show Us Your DIY Builds Thread!
Replies: 114
Views: 5590

Re: The 2021 Show Us Your DIY Builds Thread!

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
by Haralds:Werk
Sun Jan 17, 2021 2:02 pm
Forum: Music Tech DIY
Topic: Scaled voltage reference with octave and semitone steps
Replies: 18
Views: 1074

Re: Scaled voltage reference with octave and semitone steps

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.
by Haralds:Werk
Sun Jan 17, 2021 8:53 am
Forum: Music Tech DIY
Topic: Scaled voltage reference with octave and semitone steps
Replies: 18
Views: 1074

Re: Scaled voltage reference with octave and semitone steps

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?
Scaled_Volt_Ref_back.JPG
by Haralds:Werk
Thu Jan 14, 2021 6:20 am
Forum: Music Tech DIY
Topic: 6..36dB VCF Lowpass/Highpass
Replies: 6
Views: 304

6..36dB VCF Lowpass/Highpass

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...
by Haralds:Werk
Wed Jan 13, 2021 2:59 am
Forum: Music Tech DIY
Topic: Utility Mixer I
Replies: 9
Views: 305

Re: Utility Mixer I

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...
by Haralds:Werk
Wed Jan 13, 2021 2:54 am
Forum: Music Tech DIY
Topic: Utility Mixer I
Replies: 9
Views: 305

Re: Utility Mixer I

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...
by Haralds:Werk
Tue Jan 12, 2021 10:00 am
Forum: Music Tech DIY
Topic: Utility Mixer I
Replies: 9
Views: 305

Re: Utility Mixer I

Just added the correct links in my first posts.
by Haralds:Werk
Tue Jan 12, 2021 9:58 am
Forum: Music Tech DIY
Topic: Utility Mixer I
Replies: 9
Views: 305

Re: Utility Mixer I

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...
by Haralds:Werk
Tue Jan 12, 2021 5:07 am
Forum: Music Tech DIY
Topic: Utility Mixer I
Replies: 9
Views: 305

Utility Mixer I

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...
by Haralds:Werk
Tue Jan 12, 2021 4:41 am
Forum: Music Tech DIY
Topic: ADSR for Eurorack derived from Elektor Formant
Replies: 6
Views: 293

Re: ADSR for Eurorack derived from Elektor Formant

dot matrix madness wrote:
Mon Jan 11, 2021 5:33 am
:yay: Nice to have a really working, simple AD/ADSR design.
Thank you. Here are some screenshots.
SCR01.PNG
SCR01.PNG (7.23 KiB) Viewed 147 times
SCR02.PNG
SCR02.PNG (7.33 KiB) Viewed 147 times
SCR03.PNG
SCR03.PNG (7.26 KiB) Viewed 147 times
SCR04.PNG
SCR04.PNG (7.5 KiB) Viewed 147 times
SCR05.PNG
SCR05.PNG (7.67 KiB) Viewed 147 times
by Haralds:Werk
Mon Jan 11, 2021 4:23 am
Forum: Music Tech DIY
Topic: ADSR for Eurorack derived from Elektor Formant
Replies: 6
Views: 293

ADSR for Eurorack derived from Elektor Formant

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 ...
by Haralds:Werk
Thu Dec 17, 2020 4:45 am
Forum: Music Tech DIY
Topic: Pitch to voltage converter
Replies: 4
Views: 330

Re: Pitch to voltage converter

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...

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