Search found 525 matches

by dot matrix madness
Wed Feb 24, 2021 5:53 am
Forum: General Gear
Topic: Hardware Sequencer to Replace my BeatStep pro.
Replies: 4
Views: 275

Re: Hardware Sequencer to Replace my BeatStep pro.

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.
by dot matrix madness
Wed Feb 24, 2021 4:04 am
Forum: Music Tech DIY
Topic: What's the best way to learn how to troubleshoot circuits?
Replies: 19
Views: 406

Re: What's the best way to learn how to troubleshoot circuits?

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...
by dot matrix madness
Tue Feb 23, 2021 4:53 am
Forum: General Gear
Topic: New Stand-Alone MPC
Replies: 835
Views: 78249

Re: New Stand-Alone MPC

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!
by dot matrix madness
Tue Feb 23, 2021 4:45 am
Forum: Music Tech DIY
Topic: The 2021 Show Us Your DIY Builds Thread!
Replies: 115
Views: 5677

Re: The 2021 Show Us Your DIY Builds Thread!

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...
by dot matrix madness
Fri Feb 05, 2021 4:41 am
Forum: Music Tech DIY
Topic: CR-8000 Cowbell & Claves clone
Replies: 8
Views: 194

Re: CR-8000 Cowbell & Claves clone

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...
by dot matrix madness
Thu Feb 04, 2021 9:33 am
Forum: Music Tech DIY
Topic: CR-8000 Cowbell & Claves clone
Replies: 8
Views: 194

Re: CR-8000 Cowbell & Claves clone

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...
by dot matrix madness
Thu Feb 04, 2021 7:45 am
Forum: General Gear
Topic: Simple Standalone Sequencer
Replies: 22
Views: 727

Re: Simple Standalone Sequencer

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.
by dot matrix madness
Tue Feb 02, 2021 11:38 am
Forum: Music Tech DIY
Topic: CR-8000 Cowbell & Claves clone
Replies: 8
Views: 194

Re: CR-8000 Cowbell & Claves clone

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-...
by dot matrix madness
Tue Feb 02, 2021 11:18 am
Forum: Music Tech DIY
Topic: The 2021 Show Us Your DIY Builds Thread!
Replies: 115
Views: 5677

Re: The 2021 Show Us Your DIY Builds Thread!

CR-8000 Cowbell and Claves adapted to Eurorack.
For schematics see my corresponding thread in the Music Tech DIY section.
DIY_CR-8000_Cowbell_Claves
DIY_CR-8000_Cowbell_Claves
DIY_CR-8000_Cowbell_Claves_board
DIY_CR-8000_Cowbell_Claves_board
by dot matrix madness
Tue Feb 02, 2021 11:11 am
Forum: Music Tech DIY
Topic: CR-8000 Cowbell & Claves clone
Replies: 8
Views: 194

CR-8000 Cowbell & Claves clone

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...
by dot matrix madness
Fri Jan 29, 2021 5:14 am
Forum: General Gear
Topic: Behringer 909 announced
Replies: 79
Views: 2945

Re: Behringer 909 announced

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...
by dot matrix madness
Tue Jan 26, 2021 3:18 am
Forum: Eurorack Modules
Topic: How long do you wait to install a new module?
Replies: 34
Views: 1098

Re: How long do you wait to install a new module?

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.
by dot matrix madness
Tue Jan 26, 2021 3:11 am
Forum: General Gear
Topic: Ensoniq Lovers Unite
Replies: 198
Views: 3866

Re: Ensoniq Lovers Unite

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.
by dot matrix madness
Wed Jan 20, 2021 3:49 am
Forum: Music Tech DIY
Topic: resetting this 555 AD envelope generator
Replies: 6
Views: 225

Re: resetting this 555 AD envelope generator

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 ...
by dot matrix madness
Tue Jan 19, 2021 5:36 am
Forum: Music Tech DIY
Topic: resetting this 555 AD envelope generator
Replies: 6
Views: 225

Re: resetting this 555 AD envelope generator

Thanks for the suggestions! Using a 2N7002 to discharge C3 in the described way does the job.
by dot matrix madness
Mon Jan 18, 2021 10:23 am
Forum: Music Tech DIY
Topic: Yocto V1 HH/Cymb help please
Replies: 5
Views: 183

Re: Yocto V1 HH/Cymb help please

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.
by dot matrix madness
Mon Jan 18, 2021 5:43 am
Forum: Music Tech DIY
Topic: Copper tape - sanity check
Replies: 4
Views: 341

Re: Copper tape - sanity check

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.
by dot matrix madness
Mon Jan 18, 2021 5:24 am
Forum: Eurorack Modules
Topic: Doepfer Small Case Power Supplies: A-100MNT vs. A-100SSB
Replies: 2
Views: 76

Re: Doepfer Small Case Power Supplies: A-100MNT vs. A-100SSB

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.
by dot matrix madness
Mon Jan 18, 2021 3:39 am
Forum: Music Tech DIY
Topic: resetting this 555 AD envelope generator
Replies: 6
Views: 225

resetting this 555 AD envelope generator

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...
by dot matrix madness
Wed Jan 13, 2021 5:08 am
Forum: Music Tech DIY
Topic: TR-909 / Nava alternative envelope for Crash & Ride?
Replies: 1
Views: 121

Re: TR-909 / Nava alternative envelope for Crash & Ride?

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...
by dot matrix madness
Mon Jan 11, 2021 6:31 am
Forum: Music Tech DIY
Topic: TR-909 / Nava alternative envelope for Crash & Ride?
Replies: 1
Views: 121

TR-909 / Nava alternative envelope for Crash & Ride?

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...
by dot matrix madness
Mon Jan 11, 2021 5:33 am
Forum: Music Tech DIY
Topic: ADSR for Eurorack derived from Elektor Formant
Replies: 8
Views: 337

Re: ADSR for Eurorack derived from Elektor Formant

:yay: Nice to have a really working, simple AD/ADSR design.
by dot matrix madness
Thu Jan 07, 2021 4:10 am
Forum: Music Tech DIY
Topic: Patch Cable DIY
Replies: 16
Views: 424

Re: Patch Cable DIY

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...
by dot matrix madness
Thu Jan 07, 2021 4:01 am
Forum: Music Tech DIY
Topic: The 2021 Show Us Your DIY Builds Thread!
Replies: 115
Views: 5677

Re: The 2021 Show Us Your DIY Builds Thread!

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...
by dot matrix madness
Wed Jan 06, 2021 8:12 am
Forum: Music Tech DIY
Topic: Patch Cable DIY
Replies: 16
Views: 424

Re: Patch Cable DIY

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 ...

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