I mean if you're able to "tap" bass lines on the pads, it should be easy to use basically any (cheap) MIDI keyboard
that has got velocity sensitive keys.

I found simulating circuits in LTSpice being really helpful to see what kind of signals are present at the various nodes. Especially when testing and debugging things I build myself from schematics. Good service manuals of existing modules/instruments contain information how these signals have to lo...

Does anybody knows
a) if the touch screen display of the MPCs can also be used with common touch pens,
which are available for smartphones and tablets?
b) if you can connect mouse & keyboard via USB?
Thanks in advance!

Hey, I just made this simple passive mult. I designed the panel in OnShape CAD, and cut it on a CO2 laser cutter in walnut hardwood. Not sure if that is going to hold it's more brittle than I anticipated - I think I now know why most panels are aluminum :) hardwood is still stiffer than cardboard o...

The frequencies for the 808 cowbell, cymbals, and hats are derived in the same way, except that the two frequencies for the cowbell are adjusted using trimmers. The Doepfer A-100 Service manual holds detailed infos which resistors and caps are needed for the various Schmitt trigger chips used in the...

Since my first LTSpice simulation of the CR-8000 hihats and cymbal circuits look alright, I don't expect any big problems in altering the trigger inputs to rising flanks. There is no big difference in the sound of the open and closed hihat and the cymbal is rather low in volume. The tricky bit is mo...

The things is that you soon realize that you want to do more with your sequencer
than initially indended. And then all the additional functionalities are suddenly
an absolute must.
Thus try to get something which is okay with your budget.

That's cool. Falafular did a Eurorack module based on this circuit. https://www.muffwiggler.com/forum/viewtopic.php?t=138598 Have you considered tackling the CR-8000 hat/symbol circuit, too? Niels never managed to get that to work, but did produce modules based on most (if not all) of the other CR-...

CR-8000 Cowbell and Claves adapted to Eurorack.
For schematics see my corresponding thread in the Music Tech DIY section.

Here's my adaption of the CR-8000 Cowbell and Claves instruments: Triggers on positive going signals and runs from +/-12V & +5V If you need it even louder replace the 100k/47pF in the last opamp by 220k/22pF. This one can of course be shared by the two instruments (as in the original CR-8000). Use o...

shipping 1-2 mths Uups, I have to have to hurry to finish my "clone" (DIY Eurorack modules) before that (mid & high tom plus ride and crash left). Anyway the RD-9 has only got the "simple" mods for bass drum and hihat that have been around for a long time. The Extra9 for the NAVA has way more extra...

For my DIY modules it's E: After hooking it up to a test PSU and checking its functions with a scope.
Bought modules: After finding/making some space in the cabinet.

The KT-88 was my first keyboard (because it had 88 keys), but looking back I should have
bought the TS-10 instead, which was more expensive.

did you just connect the drain and source across C3? This solution works in the simulation (not tested on the bread board yet) and starts the envelope at zero with each trigger pulse. To retrigger the envelope at its current level connect the gate of the 2N7002 to ground instead. Of course the 3k9 ...

Thanks for the suggestions! Using a 2N7002 to discharge C3 in the described way does the job.

A weak sounding instrument could also indicate lacking accent. However, since both Cymbal and HiHat are affected
indeed speaks for something in their common path. Murphy's law: It's always the chip that isn't socketed.

The best shielding doesn't help if the interferences sneak in through the power supply or the
external trigger signals. I've got that problem with my Beatstep Pro that has "noisy" LEDs.

The A-100MNT delivers about half of the power as the A100SSV (due to the employed voltage regulators), whereas the later
comes without additional voltage regulation. Thus it's either sticking to a small case or going for a better power supply,
such as the A-100PSU3.

Dear experts: I've got this simple AD envelope generator based around a 555 timer chip (based on Jonathan Jacky's ADSR from Electoronics Vol.11 (1980) pp-137-138). The OP77 was just included to stick to standard LTSPice components (TL071 will do, I know). LTSpice .asc file is in the attached archive...

Being in the process of simulating an 555-based AD generator for this purpose: Can somebody with a TR-909 or a NAVA and a oscilloscope do me a favor and capture the corresponding envelopes of the Crash/Ride with different tune settings, so that I get an idea about the voltage levels going on? In the...

I wonder If anybody has got an idea how the alternative Attack/Decay envelope for the Crash and Ride cymbals of the TR-909 NAVA clone has been realized as given in the Extra9 expansion from Wellental? What is obvious from the installation guide is that the alternative (retriggerable) envelope is bas...

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

I find making my own cables a good way to fill my mind with rage and frustration, which is why I buy them :) Yes, I have to admit that I had a few of those moments with my very first cable soldering experiments as well. :lol: I found crimping twisted pair cables to be the most annoying experience m...

But LEGO is nice, here my inductor winding machine with counter for my Moog (tm) 907 and 914 clones: Spulenwickelmaschine_LEGO.JPG See also http://www.analog-monster.de/mmt914_en.html The idea of realizing the counter by using a pocket calculator is awesome! Regarding the number of coils need for t...

Naive question - is it really worth making your own? Is it quality, or price per unit, or personal taste, or something else that is driving your desire to make? I found making my own RCA cables is worth the effort: Neutrik plugs and symmetric microphone cable beats "high end" cables simply for the ...