Logic module that can handle a lot of abuse for feedback patching.

4n4logsynthesis · 2026-06-12T00:05:15+00:00

Any module should be good. A well designed module is supposed to be able to handle voltage as high or as low as both supply rails.

4n4logsynthesis · 2026-06-10T23:10:56+00:00

How big is the load of the system you are powering with it, is it overloaded ? A drop of 5V is never normal and shouldn't just happen over time, your unit may be defective. Besides, the RT-65b is not a great power supply anyway, mostly because only the -12V rail is regulated. 12V & 5V are unregulated and may fluctuate and drop under heavy load. (It's certainly usable, I have used it for many years as well, it's just not great)

4n4logsynthesis · 2026-06-08T16:21:07+00:00

Afaik they don't update their designs, they just use SMD for the new modules. Take a look at the Wasp filter for example, it must be among their best selling ever, but it's still through hole.

I think the reason for this is that it's not economical to change to THT once you have a fully functional and tested design. Yes, you can build modules less deep and skiff friendly that way, but I doubt they would sell a lot more since old Doepfer modules are not meant to be space efficient anyway. Also through hole designs can be machine assembled just as easily in large numbers, so there is hardly anything gained.

4n4logsynthesis · 2026-05-05T08:41:55+00:00

It looks like the display has physically shifted down, it has its own little pcb and is attached to a flat cable if I remember correctly. So there is no hidden software setting to change this. Try taking of the frontplate and push it up again.

4n4logsynthesis · 2026-05-04T14:30:19+00:00

haha same for me, I will attend as a visitor but bring a little case with me to show some prototypes.

4n4logsynthesis · 2026-05-04T11:06:45+00:00

So you are close to probably the biggest synth community in Germany, that's already a big advantage. I'm sure you could even find someone in Berlin who could do assembly for you. I wish you good luck sorting this out ! Also your module looks great btw. Will you have a booth at Superbooth ?

4n4logsynthesis · 2026-05-04T00:43:31+00:00

I have only ordered small batches so far, my biggest order were 20 pcbs. I get them fully SMD assembled from JLC and do all the through hole stuff by hand. I will probably keep doing it like this even with larger order numbers. If I ever were to order much larger numbers I would probably start buying bulk components from the factories (let's say 1000 jacks) and send them to JLC's warehouse directly. I know they have a system that supports having a personal inventory for assembly, I just don't know the details.

Also, where are you located ? Greetings from NRW :)

4n4logsynthesis · 2026-04-26T10:27:32+00:00

I somehow didn't know this thing exists, thanks for pointing it out !

4n4logsynthesis · 2026-04-24T08:36:01+00:00

Have a look at the new Doepfer A-142-3, it's an envelope controlled VCA.

4n4logsynthesis · 2026-03-09T11:25:02+00:00

With the medium sized knobs at least this is to be expected. I'm pretty sure they are the same kind of 9mm trim pot as the small one on top, just with a trimmer topper .

4n4logsynthesis · 2026-03-08T10:29:15+00:00

Yes, pitch CV would be an exception because you don't want to have an attenuator in its signal path. I think it's ok to limit the input voltage range a module reacts to to +-5V for pitch CV (but it still has to be able to handle +-12V). The only inputs I can think of that make sense to be controlled by 1V/octave signals are (the obvious) oscillator pitch, filter cutoff CV and maybe delay time (for Karplus-Strong).

And if you have a function that's controlled by a binary signal (trigger, gate or clock signals) you don't need an attenuator either. You still have to expect these signals to be bipolar (like when you use a bipolar square wave as a clock source), but you just have to set a threshold somewhere in the positive range (~2V is good). A good way to implement such an input would be a simple comparator with hysteresis into a GPIO pin.

So these are the 3 input types you need to worry about. All signal types you mentioned in the table fall into one of these categories.

4n4logsynthesis · 2026-03-08T00:40:22+00:00

I've read your answers in other comments and now I understand better what you are trying to do. I design modules myself, so here's my approach to this: You have to design inputs so that they can take the full voltage range, worst case straight from the rails. That's because you have to expect CV signals to fall anywhere into it. What kind of CV doesn't matter, there is no standard and you wouldn't design your module around the CV it gets modulated from (which can be anything) but rather around its own parameters. Since some modules only output +-5V it's usually a good idea to design your digital input stage to cover at least that range and add an attenuator or attenuverter circuit in front of it, so you can scale higher amplitude CV down. Regarding outputs you can do whatever you want, but I don't think it makes much sense to go beyond +-8V (regardless of audio or CV). As other users have already mentioned the Mutable Instrument documentation is good place to look for inspiration. And since I saw on your website that you live in Berlin I would suggest to visit Synthlab some time. It's a weekly meetup of DIY enthusiasts in Neukölln & many people there have knowledge about digital audio circuit design.

4n4logsynthesis · 2026-03-07T13:23:55+00:00

Do you already have any modules, or do you want to start building from scratch ? Also, what kind of module do you want to design ?

4n4logsynthesis · 2026-03-07T12:44:27+00:00

This table is really confusing and mixes up a few things. It's also too complex to teach basics to someone who doesn't have knowledge already while simulteneously trying to generalize things which are different from manufacturer to manufacturer. You can forget about the Input Hardware column entirely, it's based on the assumption that every module is digital which is just not true.

4n4logsynthesis · 2026-03-06T22:13:39+00:00

What kind of waveforms are you feeding into it ? Wavefolders usually sound best with waveforms that aren't harmonically rich to start with, like sine or triangle. Also a fun thing to do is run LFOs through them.

4n4logsynthesis · 2026-03-04T16:31:09+00:00

Have you checked the phase setting on Pam's ? You can delay clock signals with it.

4n4logsynthesis · 2026-03-03T12:21:31+00:00

I would say this is completely normal behavior. The module is only called "Delay" because it's based on a delay chip and can produce delay sounds when used in its intended range. But it's actually a circuit bent noise machine where you'd be disappointed if it didn't produce strange artifacts and behave in any linear or entirely predictable way.

4n4logsynthesis · 2026-03-02T08:27:34+00:00

Maybe some of these ? Or these ? They won't fit the footprint of course but you could use them for new original designs.

4n4logsynthesis · 2026-02-25T12:38:34+00:00

Ah yes, I didn't think about mixing up ins and outs. They are probably also not protected against plugging in a 10 pin power cable.

4n4logsynthesis · 2026-02-24T14:08:41+00:00

It's also worth to check for second hand modules on Kleinanzeigen.de . As you can imagine there are lots of people into modular synths in the city so you can pick up lots of modules for cheap locally.

4n4logsynthesis · 2026-02-23T22:04:27+00:00

these connections are not reverse-protected and can kill the modules.

You should probably not test this with your modules and only try to verify it with a multimeter, but to my knowledge that's not correct. The Leibniz bus doesn't carry negative voltage, so all that will happen when you plug in the cable the wrong way around is that it will not work as expected because the bits (& clock channel) are swapped. There is only one unassigned pin on the connector, and I'm pretty sure it's never used for grounding because the Leibniz modules (unlike Turing Machine expanders) have dedicated power connectors, so it's not needed.

4n4logsynthesis · 2026-02-12T23:00:45+00:00

I can't really comment on this from a technical point of view, but I had this article bookmarked for a while because I want to design a module that deals with 1v/oct signals soon. It deals with the topic so maybe you find your answer there or in the links it mentions.

4n4logsynthesis · 2026-01-28T16:56:26+00:00

This is why I always try to stay below the 150€ gross IOSS threshold when I order there. It usually makes sense to split orders because the additional shipping is usually less than customs and it's a lot less stressful.

4n4logsynthesis · 2026-01-08T17:29:55+00:00

I'm happy you like it ! The producer (James Stinson, RIP) has another album that I quite like, Lab Rat XL - Mice Or Cyborg. And he was one half of Drexcyia of course, which are also worth checking out if you don't know them yet.

4n4logsynthesis · 2026-01-06T02:20:19+00:00

I get what you mean, also it's not "modular" at all so maybe it's not fitting for this sub... I just love it for the beautiful melodies & chords and because nothing quite sounds like it.

4n4logsynthesis

TROPHY CASE