Search found 468 matches

by dot matrix madness
Thu Oct 22, 2020 7:04 am
Forum: Music Tech DIY
Topic: CR-78 Guiro clone with decay poti
Replies: 5
Views: 254

Re: CR-78 Guiro clone with decay poti

Hearing is believing: Here's a short drum loop that makes use of metal beat, tambourine, and guiro together with my other analog drum modules:

by dot matrix madness
Fri Oct 16, 2020 5:03 am
Forum: Music Tech DIY
Topic: CR-78 Guiro clone with decay poti
Replies: 5
Views: 254

Re: CR-78 Guiro clone with decay poti

will there be or is there any full CR-78 clone out there? 78 prices just went off the charts recently It seems that Behringer is planning to up come up with a CR-78 "replica" (simply use the search machine of your choice). Endorphin.es' Blck Noir has got most of the instruments with additional twea...
by dot matrix madness
Fri Oct 16, 2020 4:37 am
Forum: Music Tech DIY
Topic: The 2020 Show Us Your DIY Builds Thread!
Replies: 423
Views: 35565

Re: The 2020 Show Us Your DIY Builds Thread!

Finished my module with the CR-78 instruments Metal Beat, Tambourine, and Guiro. The later two have decay potis as extras. For schematics see the corresponding threads in the "Music Tech DIY" section.DIY_CR78_front.JPG hey, nice one :tu: did you print those sticker labels with a special device? or ...
by dot matrix madness
Thu Oct 15, 2020 9:01 am
Forum: Music Tech DIY
Topic: CR-78 Guiro clone with decay poti
Replies: 5
Views: 254

Re: CR-78 Guiro clone with decay poti

A technical remark regarding triggering of the guiro circuit above: The trigger signal should be at least 3msec long. It works straight away connected to one of the drum gates of my Arturia Beat Step Pro (using default settings), but did not trigger from a Ladik M-210 MIDI to 12ch. converter, which ...
by dot matrix madness
Tue Oct 13, 2020 12:49 pm
Forum: General Gear
Topic: When gear has lots of features you don't use do you want to downgrade?
Replies: 29
Views: 745

Re: When gear has lots of features you don't use do you want to downgrade?

Dr. Sketch-n-Etch wrote:
Tue Oct 13, 2020 11:57 am
I'm thinking of removing the A string from my guitar. Most of the time I just mute it with the tip of my thumb anyway.
An open string will add Flamenco-like feeling to your chords. ;)
by dot matrix madness
Tue Oct 13, 2020 12:44 pm
Forum: General Gear
Topic: When gear has lots of features you don't use do you want to downgrade?
Replies: 29
Views: 745

Re: When gear has lots of features you don't use do you want to downgrade?

lisa wrote:
Tue Oct 13, 2020 12:49 am
I don't care about functions I don't use. It bugs me to have gear I never use, though.
I fully second that emotion. And on top it bugs me being too lazy to read extensive
manuals, which on the other hand keeps me off buying new gear with heaps of
features I wouldn't be using. ;)
by dot matrix madness
Tue Oct 13, 2020 8:04 am
Forum: Music Tech DIY
Topic: The 2020 Show Us Your DIY Builds Thread!
Replies: 423
Views: 35565

Re: The 2020 Show Us Your DIY Builds Thread!

Finished my module with the CR-78 instruments Metal Beat, Tambourine, and Guiro.
The later two have decay potis as extras. For schematics see the corresponding
threads in the "Music Tech DIY" section.
DIY_CR78_front.JPG
by dot matrix madness
Tue Oct 13, 2020 7:56 am
Forum: Music Tech DIY
Topic: CR-78 Guiro clone with decay poti
Replies: 5
Views: 254

CR-78 Guiro clone with decay poti

Just finished the Guiro section of the CR-78 with a decay poti as extra. Thus I was able to get rid of the second trigger input and the corresponding logic circuit. CR78_Guiro_schematic.png Both trimmers can be conveniently be adjusted by ear: VR59 determines the pitch and VR63 sets the amount of wh...
by dot matrix madness
Mon Oct 05, 2020 3:35 am
Forum: Music Tech DIY
Topic: Noise Transistor “Selection”
Replies: 16
Views: 363

Re: Noise Transistor “Selection”

Dot Matrix, you mention “more noisy” which is language I have heard before. Is that a quality or quantity description? If it’s a quality, is that viewable on a spectral analysis? Or is “noisy enough” a way to say that its output is low? I am intrigued by the idea that unmatchable transistors are no...
by dot matrix madness
Sun Oct 04, 2020 7:24 am
Forum: Music Tech DIY
Topic: Noise Transistor “Selection”
Replies: 16
Views: 363

Re: Noise Transistor “Selection”

I observed that transistors that couldn't be matched for use as expo pairs are typically more noisy and thus are good candidates to try. Otherwise it's a matter of amplification. Most transistor-based noise circuits contain trimmers to adjust the required level. Often you can trim those by ear. But ...
by dot matrix madness
Fri Oct 02, 2020 2:51 am
Forum: Music Tech DIY
Topic: Another little somthing I've been working on: DR110 inspired 6 voice drum module
Replies: 55
Views: 1386

Re: Another little somthing I've been working on: DR110 inspired 6 voice drum module

[...] What I still need to work on: -The cymbal osc frequenices were all higher than I had calculated. I assume this is because the hysteresis tolerance on 40106s is not very tight. It still sounds good, but the original DR110 manual makes a big stink about how nuts on all those 4 frequencies need ...
by dot matrix madness
Wed Sep 23, 2020 5:09 am
Forum: General Gear
Topic: which stand-alone sequencer?
Replies: 25
Views: 884

Re: which stand-alone sequencer?

Luckily I don't need a sequencer than can handle those crazy time signatures Colon Nancarrow was using. ;)
by dot matrix madness
Tue Sep 22, 2020 2:41 am
Forum: General Gear
Topic: which stand-alone sequencer?
Replies: 25
Views: 884

Re: which stand-alone sequencer?

Thanks for all recommendations so far! I see there are several options (which is nice), but in the end it's a matter of "gut feeling" what you choose. For the Midibox this is "not another soldering project on the to do list". The musical genre I'm pursuing at the moment is in between dance and ambie...
by dot matrix madness
Mon Sep 21, 2020 10:08 am
Forum: General Gear
Topic: which stand-alone sequencer?
Replies: 25
Views: 884

Re: which stand-alone sequencer?

MPC One looks pretty compelling for your need! Cirklon is still king if I must believe owners' statements, get on that list if you want to try one in due time. Some other options: Social Entropy Engine (optional CV expansion board, but.... It's not for sale new atm) Squarp Pyramid Midibox https://w...
by dot matrix madness
Mon Sep 21, 2020 7:51 am
Forum: General Gear
Topic: which stand-alone sequencer?
Replies: 25
Views: 884

which stand-alone sequencer?

I would like to see your suggestions what (hardware) sequencer to get (new or used). Requirements: + Must run stand-alone without computer (I've seen too many operating systems come and go over the years that made my software obsolete), but for editing settings is okay + At least 16 tracks per seque...
by dot matrix madness
Tue Sep 15, 2020 3:50 am
Forum: Music Tech DIY
Topic: How much drift is a good thing?
Replies: 15
Views: 382

Re: How much drift is a good thing?

Here's one of mine. On some recent builds I've also been adding a blob of polyurethane glue on top - not to improve the thermal connection (the contact handles that) but just to prevent the wire tie from slipping off. DSCN1086.jpg Typically I apply some thermal conductivity paste (very few because ...
by dot matrix madness
Mon Sep 14, 2020 3:43 am
Forum: Music Tech DIY
Topic: 15V to 12V Adaptor
Replies: 34
Views: 936

Re: 15V to 12V Adaptor

Interesting thread guys! I'm I right that the LM1085IT-12 can be implemented the same way
(just caps to ground) as a µA7812 (going down from +15V to +12V) ?
by dot matrix madness
Mon Sep 07, 2020 10:07 am
Forum: Music Tech DIY
Topic: Powered USB hub in Eurorack ?
Replies: 3
Views: 87

Re: Powered USB hub in Eurorack ?

Well, mine is just a power supply for 4 USB plugs salvaged from an old PC. With a little metal bending it fitted right into 3U (about 3HP wide).
Finding out which pins from the multicore cable go where took a bit time. But typically old PCs also contain USB hubs.
by dot matrix madness
Thu Sep 03, 2020 6:08 am
Forum: Music Tech DIY
Topic: Any of these ICs worth keeping?
Replies: 19
Views: 784

Re: Any of these ICs worth keeping?

The CD4040BE is used in the TR-909 and clones (Hi-Hat, Ride, Crash) circuits, but nothing special.
The larger ICs (as MikeDB said) might be interesting to others.
by dot matrix madness
Tue Sep 01, 2020 4:29 am
Forum: Music Tech DIY
Topic: CR-78 Tanbourine clone schematic
Replies: 2
Views: 173

Re: CR-78 Tanbourine clone schematic

jorg wrote:
Mon Aug 31, 2020 9:08 am
Nice! That's elegantly simple.
The bongos, conga, and bass drum in the CR-78 are even simpler (no coils used).
Clearly there has been an evolution regarding complexity and sound when looking at
the later TR-808 and TR-909.
But the "latin" percussion (bongos, tambouine, guiro) was dropped.
by dot matrix madness
Mon Aug 31, 2020 2:29 am
Forum: Eurorack Modules
Topic: 1075 mA on Doepfer (PSU2) 1200, risky?
Replies: 17
Views: 302

Re: 1075 mA on Doepfer (PSU2) 1200, risky?

The PSU has got fuses, thus in case there is too much current draw these will blow. I guess your current draw is estimated from summing up the listed current draw of your modules, so you should be safe. The peak of current draw is during starting up while switching power on as all capacitors are cha...
by dot matrix madness
Sat Aug 29, 2020 4:43 am
Forum: Music Tech DIY
Topic: CR-78 Tanbourine clone schematic
Replies: 2
Views: 173

CR-78 Tanbourine clone schematic

Here's my stand alone version of the CR-78 Tambourine for Eurorack levels with modern parts: CR78_Tambourine_schematic.png Trim the white noise level by ear. Basically any BC547C transistor works as noise transistor. Extras: The original tambourine has got two trigger inputs (short and long). Here y...
by dot matrix madness
Wed Aug 26, 2020 7:21 am
Forum: Music Tech DIY
Topic: Eurorack why is noone using the 5V of the psu?
Replies: 31
Views: 751

Re: Eurorack why is noone using the 5V of the psu?

Let's consider the historical facts: The larger pinheader was there first to distribute the CV and gate signal without the need of patch cables. It also carried +5V, which was needed for the MIDI to CV interface, however the +5V came from an extra power supply whereas +/-12V came from one linear PSU...
by dot matrix madness
Sun Aug 23, 2020 10:00 am
Forum: Music Tech DIY
Topic: AS3310 problems with Different TL072 ICs (TL072IP and TL072CP)
Replies: 6
Views: 249

Re: AS3310 problems with Different TL072 ICs (TL072IP and TL072CP)

Don T wrote:
Sun Aug 23, 2020 9:45 am
I wonder if the issue was due to BJT input transistors (LM358) vs. JFET input transistors (TL072)?
Furthermore the TL072 has a faster slew rate than the LM358 (0.6 vs. 13 V/µsec).
by dot matrix madness
Thu Aug 20, 2020 5:05 am
Forum: Music Tech DIY
Topic: 808 Kick Input (Accent Clarification)
Replies: 5
Views: 162

Re: 808 Kick Input (Accent Clarification)

As trigger you can use any rising flank, e.g. from any LFO. This trigger input as show above accepts also higher positive voltages than +10V. I typically use a push button with a 10k resistor to the positive rail as manual trigger. For the accent I 've added a separate jack that is normalized to the...

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