Search found 131 matches

by whomper
Mon Sep 30, 2019 3:45 am
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

[quote="Nuclues" Did you replace R34 and R158 with a Wire or just leave it? [/quote] I have left it as is, i.e. nothing connected. Please also observe from my previous comments regarding carrier board R51 and R28 are now 100K, R2 and R3 are now 4K7. This should bring output voltage to proper level. ...
by whomper
Sun Sep 29, 2019 7:48 am
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

Thanks Whomper. it sounds really sweet Question : Is there a way to test the voiceboards, without using the hostcard? All my voicecards have no sound from the oscillators, but I can hear the filter is working all the best from Nick Thanks, the synth sounds real good, has that 'warm' sound that comp...
by whomper
Sat Sep 28, 2019 8:55 am
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

Here's a quick sequence of me playing with the CrowBX knobs as the sequence fires along. You can hear filter sweep, filter with envelope mod, a few filter types (V2.4) SQR with PWM and hard sync Two cards are playing, each one different sequence (L and R). https://soundcloud.com/erezyaary/crowbx-seq...
by whomper
Mon Sep 09, 2019 1:17 pm
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

I had to eliminate some of the 1n SMD caps on the carrier board to get the envelope working (Attack, Decay and Release) and a few changes I've posted elsewhere. Nice work! Can you give more details on which caps were eliminated and the other changes to get it working? Any sound clips? I did elimina...
by whomper
Sun Sep 08, 2019 3:14 pm
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

Wanted to drop a quick note that the latest boards 2.4 voice and March 2017 main & carrier boards do produce a working CrowBX. I had to eliminate some of the 1n SMD caps on the carrier board to get the envelope working (Attack, Decay and Release) and a few changes I've posted elsewhere. Any thoughts...
by whomper
Sun Sep 08, 2019 3:13 pm
Forum: Music Tech DIY
Topic: OBX voice card (with non-custom CEM3310 equivalent circuits)
Replies: 1752
Views: 215176

Wanted to drop a quick note that the latest boards 2.4 voice and March 2017 main & carrier boards do produce a working CrowBX. I had to eliminate some of the 1n SMD caps on the carrier board to get the envelope working (Attack, Decay and Release) and a few changes I've posted elsewhere. Any thoughts...
by whomper
Sun Feb 24, 2019 10:48 am
Forum: Music Tech DIY
Topic: OBX voice card (with non-custom CEM3310 equivalent circuits)
Replies: 1752
Views: 215176

I've managed to create a working 4 voice system v2.4 and am in the process of designing panel and enclosure.

What have folks done wrt enclosure? Is there a customer metal based one?
by whomper
Fri Feb 22, 2019 6:20 am
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

Bless, Nick Please do not forget to make sure you have 5v in respective Gate in, otherwise EG will not trigger and respective VCA will not pass audio. You don't need to bother yourself with CV signal to verify audio path, so just hook a 5v from elsewhere in the board to Gate1 of the board and test ...
by whomper
Fri Feb 22, 2019 3:14 am
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

Hi Whomper Just to understand, is it vers 2,4 voiceboards you have in your working Fourvoice? I have 8 voiceboards (vers 2,4) with no sound, so i'm very interested :) best from Nick As Chrutil mentioned, we both have 2.4 boards. Here are a few of my learnings when debugging the boards: 1. Overall, ...
by whomper
Thu Feb 21, 2019 11:43 am
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

A quick update on my build (4 voice complete), yeah, I Front and carrier boards are all working but one last, hopefully, issue: When front board is not connected with the carrier one, I get proper 0 - -0.25v for Attack, Decay and Release. Once carrier board is connected, the range change to -0.25v ...
by whomper
Wed Feb 20, 2019 4:29 pm
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

A quick update on my build (4 voice complete), yeah, I know this is an 8 voice thread but I reckon most here have V2.4 as I and the main thread is awfully quite.... I have managed to get all 4 voices working, meaning tuning according to procedure (all but VCA level in the end, not sure its needed bu...
by whomper
Mon Feb 04, 2019 3:41 pm
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

BTW, my envelopes measure -0.25 to -0.5 on IC pins and the attack/decay/release do not work. Not sure where's the problem. When carrier board is connected to main board and there is no sound card installed, I get -0.23v to -0.45V out of Attack/Decay/Release. When the main board is not connected to ...
by whomper
Mon Feb 04, 2019 2:41 pm
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

By the way, does anyone have a description of the voice card pins and the signal expected? I think I have most, but there are a few I am unclear about. https://www.muffwiggler.com/forum/userpix2/3920_obx_pinout_1.jpg So helpful! Thanks for the table and voltage mappings. Should come in handy in deb...
by whomper
Sat Feb 02, 2019 2:12 am
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

mOBiTh wrote:
whomper wrote:BTW, does anyone know if I need to have jacks connected to the main board when testing sound? All my tests are only with CV and gate in for 1st board.
Which jacks are you referring to exactly?
Well, any ones that might require to have GND connected to the TIP so as to not leave input open.
by whomper
Fri Jan 25, 2019 1:55 am
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

After poking for a minute tonight I realized that I have no output because I am an idiot. Not only had I left R202/R204 open, sending the output to the OBX output header, not to the new inline port below the 15V voltage regulators, but I also measured with the 10x probe on my scope :deadbanana: Now...
by whomper
Wed Jan 09, 2019 3:13 am
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

BTW, does anyone know if I need to have jacks connected to the main board when testing sound? All my tests are only with CV and gate in for 1st board.
by whomper
Wed Jan 09, 2019 3:10 am
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

well, now i'm kinda glad scott sent me the older boards despite my having ordered the newer version. at least i know it'll work when i do get around to finishing it. all seems pretty random as to who got what. has anyone outside of the USA received any boards from Scott in the last year? I have rec...
by whomper
Mon Jan 07, 2019 6:27 am
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

mOBiTh wrote:do you have the 'original' v2 / v2.1 schematics?
I found some at viewtopic.php?t=83363&highlight= will send you what I have.
by whomper
Mon Jan 07, 2019 5:23 am
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

Here's one of my cards as reference and feedback. Debugging with our schematics is tough...

Image
by whomper
Mon Jan 07, 2019 4:52 am
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

I have 4 boards populated plus the two main boards for a 4 board system. Those are V2.4, so I'm in with the rest unable to debug. Tried all boards, but not sound coming out of neither. I've had contact with Scott a few weeks back and he mentioned he had a crash in his CAD software and will try to di...
by whomper
Sat Dec 15, 2018 10:30 am
Forum: Music Tech DIY
Topic: OBX voice card (with non-custom CEM3310 equivalent circuits)
Replies: 1752
Views: 215176

Debugging my 4 voice cards V2.4 as there is no audio on outputs. Tracing past 4053 but then am stuck as the supplied schematics differ from actual board. Anyone with working V2.4 voice cards? Any hints on getting audio out? Any schematics? One more thing, do I need to have the jacks wired to board f...
by whomper
Sun Sep 30, 2018 1:26 pm
Forum: Music Tech DIY
Topic: OBX voice card (with non-custom CEM3310 equivalent circuits)
Replies: 1752
Views: 215176

Also, I'm not sure what the resistor looking things called L1 and L2 are supposed to be. Whomper, I saw you put ferrite beads there, did you deduce that from something other than just the naming? I recall you had a question about the LEDs by the Vactrols, that is confusing to me as well. Did you ge...
by whomper
Fri Sep 21, 2018 4:12 am
Forum: Music Tech DIY
Topic: OBX voice card (with non-custom CEM3310 equivalent circuits)
Replies: 1752
Views: 215176

I've soldered the two J112 Q11/Q12 aligned to the DGS marking and not the image. Do I need to desolder and change orientation?
by whomper
Sat Sep 15, 2018 5:13 am
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

Do folks have the latest schematics and build guides for V 2.4 boards? This could help in debugging the issues I see
by whomper
Fri Sep 14, 2018 6:02 am
Forum: Music Tech DIY
Topic: crOwBX 8-voice
Replies: 247
Views: 28471

Hi, Am testing the host and carrier. So far host calibration works, but carrier calibration portamento does not work and I can not get the distortion setting to 0, lowest on both is 0.3v. Probably part toleration issue. Attached are two images of my build for folks to check their's and suggest diffe...

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