Search found 38 matches

by csaban
Tue Apr 28, 2020 5:52 am
Forum: Music Tech DIY
Topic: Doboz XIIO, No gates when arp/seq plays a new note? Is this not a feature?
Replies: 1
Views: 109

Re: Doboz XIIO, No gates when arp/seq plays a new note? Is this not a feature?

I think it only sends gate signals when the plates are pressed.
by csaban
Mon Apr 06, 2020 9:28 am
Forum: Music Tech DIY
Topic: Plain No Frills CV Keyboard
Replies: 13
Views: 1015

Re: Plain No Frills CV Keyboard

MFOS "Matrix Scanning 1V/Octave Keyboard Circuit" is designed for matrix keyboards.
by csaban
Mon Jan 07, 2019 6:55 am
Forum: Music Tech DIY
Topic: Project PRO2021 - A Pro-One keyboard synth
Replies: 1279
Views: 70801

A) Yes.
B) No, I have a crimping tool
C) Custom case / open-source case plans? (I'd like to repurpose a broken 49 key controller as a keybed, but that would require a longer chassis).
by csaban
Tue Dec 11, 2018 10:43 am
Forum: Music Tech DIY
Topic: Future Sound Systems - Brunswick
Replies: 70
Views: 11042

Also, we're working on a manual for release, hopefully, by the end of the year. However, in the meantime, for those out there who are a little confused by the signal routing on this thing, we've drawn up a signal flow diagram, which can be downloaded here . Thank you! That's handy! I saw you guys u...
by csaban
Mon Dec 10, 2018 11:33 am
Forum: Music Tech DIY
Topic: Quad ADSR DIY
Replies: 17
Views: 1113

Go to electro-music.com/forum and visit the DIY section. Ther in the stickies at the top will be a collection of Nicolas circuits. Find the ADSR which has a simple, inexpensive build on stripboard. More better, it is a really good ADSR. Can you please link me to the post? I cant find it :despair: I...
by csaban
Sat Nov 10, 2018 12:53 pm
Forum: Music Tech DIY
Topic: Future Sound Systems - Brunswick
Replies: 70
Views: 11042

PCB is ~194 mm x ~120 mm

In case you want to put it behind a panel, make sure you solder C5, C16 and C20 leaning on the board :bang:
by csaban
Tue Nov 06, 2018 6:58 am
Forum: Music Tech DIY
Topic: Project PRO2021 - A Pro-One keyboard synth
Replies: 1279
Views: 70801

:woah: Would it work with other keybeds? So I've built this to give the original CPU (or the TUrbo CPU in this case) the 3 octave switch/diode matrix that it expects. It so happens that the Fatar 37 key OEM unit has this configuration. As long as the other keybed was laid out with the Make/Break sw...
by csaban
Mon Nov 05, 2018 3:48 pm
Forum: Music Tech DIY
Topic: Project PRO2021 - A Pro-One keyboard synth
Replies: 1279
Views: 70801

:woah:

Would it work with other keybeds?
by csaban
Fri Sep 28, 2018 10:59 am
Forum: Music Tech DIY
Topic: Rakit schematics?
Replies: 13
Views: 1565

Have you tried their facebook group? https://www.facebook.com/rakit.kits
by csaban
Thu Sep 27, 2018 1:06 pm
Forum: Music Tech DIY
Topic: RYO Penta issues - help me troubleshoot?
Replies: 39
Views: 2081

If I recall correctly, the one I had issues with (isn't mine, helped a friend fixing it) had to have all the 2N7000 replaced as they were all DOA.

If you have a spare, you could try replacing one of Q2, Q3, Q4, Q5 or Q6 and see if that fixes it.
by csaban
Wed Sep 26, 2018 4:08 pm
Forum: Music Tech DIY
Topic: RYO Penta issues - help me troubleshoot?
Replies: 39
Views: 2081

My first guess would be LED orientation... :)
by csaban
Wed Jun 27, 2018 2:06 am
Forum: Music Tech DIY
Topic: Let's fix this beautiful old mixer [Satt sam 82]
Replies: 16
Views: 1374

Have you tried the "attachable battery unit"? I know it's not the transformer, but at least you'd see if it works.

Image
by csaban
Mon Jun 18, 2018 11:41 am
Forum: Music Tech DIY
Topic: [IC] Eurorack blank selection packs
Replies: 8
Views: 581

I'm interested! +1 for the corner holes.
by csaban
Sat May 26, 2018 1:02 pm
Forum: Music Tech DIY
Topic: Dreadbox Erebus DIY kit
Replies: 232
Views: 24441

Is it just me or is the vca control extremely non linear? It’s hard to coax a smooth decay or release from it, even using external envelopes. At long decay or release settings, the vca stays at full volume then just falls to zero really quick instead having a slow drop in volume. All my units behav...
by csaban
Wed May 16, 2018 1:24 pm
Forum: Music Tech DIY
Topic: Dreadbox Erebus DIY kit
Replies: 232
Views: 24441

Looking at the schematic, I think the EG is a variation of this one http://electro-music.com/forum/phpbb-files/adsr_160.jpg (from http://electro-music.com/forum/viewtopic.php?t=31473). With my limited knowledge, it seems like the 1M pot for release was replaced with a diode (D10).
by csaban
Fri May 11, 2018 5:42 am
Forum: Music Tech DIY
Topic: Dreadbox Erebus DIY kit
Replies: 232
Views: 24441

It's interesting that Dreadbox can't/won't release the schematics and they don't provide support either. Feels a bit like a black box when it comes to troubleshooting. :ripbanana: Could anyone confirm how the expo conversion works on this? I'm assuming it's done with the ATmega and a pair of DACs, s...
by csaban
Wed May 02, 2018 3:12 pm
Forum: Music Tech DIY
Topic: Kassutronics VCO 3340 (eurorack)
Replies: 135
Views: 15294

I'm in for a complete set!
by csaban
Mon Apr 30, 2018 12:46 pm
Forum: Music Tech DIY
Topic: Dreadbox Erebus DIY kit
Replies: 232
Views: 24441

I'm afraid you have to wait till the pcb & schematic pdf is published.
by csaban
Wed Apr 18, 2018 3:37 pm
Forum: Music Tech DIY
Topic: RYO Penta issues - help me troubleshoot?
Replies: 39
Views: 2081

I'm glad to hear you got the steps back OB1! I hope you've ordered more than one 2N7000 replacement... (Please bear in mind, I'm not an EE, just trying to trace the symptoms on the schematic) LED problem: the LEDs are controlled by the other 2N7000s (Q2-Q6). I would try to replace Q5. Range problem:...
by csaban
Fri Apr 13, 2018 2:08 pm
Forum: Music Tech DIY
Topic: RYO Penta issues - help me troubleshoot?
Replies: 39
Views: 2081

I'm afraid 2N3904 won't substitute the 2N7000...
by csaban
Fri Apr 13, 2018 9:09 am
Forum: Music Tech DIY
Topic: RYO Penta issues - help me troubleshoot?
Replies: 39
Views: 2081

I think I've found the issue with mine, Q1 (2n7000) seems to be broken. By using a multimeter in continuity tester mode, the source and drain legs seems to be connected. As far as I understand electronics (and bare in mind I'm not an expert in any sense) the diode between source and drain should not...
by csaban
Thu Apr 12, 2018 1:14 am
Forum: Music Tech DIY
Topic: RYO Penta issues - help me troubleshoot?
Replies: 39
Views: 2081

Have you tried shorting the reset and clock enable pins on the 4017 (13 & 15)? Mine has similar problems (only first step is cycled), and out of curiosity, I tried to invert the clock enable and it started to behave, sort of. The 4017 has +5V on the reset pin and 0V on the clock enable, which I thin...
by csaban
Wed Apr 04, 2018 12:55 pm
Forum: Music Tech DIY
Topic: [IC] Euro rack blanks
Replies: 2
Views: 357

I'm interested as well.
by csaban
Tue Feb 06, 2018 4:14 pm
Forum: Music Tech DIY
Topic: SEDECIM - the 16 note + gate euro module
Replies: 24
Views: 1060

I'm interested as well!
by csaban
Tue Jan 23, 2018 10:08 am
Forum: Music Tech DIY
Topic: New Syncussion with MIDI and Silent power - VIDEOS
Replies: 993
Views: 86271

Nice!

What type of switches are those?

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