Search found 348 matches

by ricko
Fri Nov 13, 2020 5:19 pm
Forum: Music Tech DIY
Topic: Case Wiring, two Meanwell RT-65B
Replies: 53
Views: 8189

Re: Case Wiring, two Meanwell RT-65B

4. I recently went through an exercise of looking at power supplies. The weak -12V of the Meanwells was a deal breaker. What did you end up going with? An external +/- 14V, +8v linear supply in a 1U rack, off Ebay. Plus LDO regulation/distribution boards (own design) so that each bus board had its ...
by ricko
Thu Nov 12, 2020 11:03 am
Forum: Music Tech DIY
Topic: MFOS adj power supply
Replies: 8
Views: 224

Re: MFOS adj power supply

About the 317.

Its datasheet (TI) warns "The device requires up to 3-V headroom (VI – VO) to operate in regulation. The device may drop out and
OUTPUT voltage will be INPUT voltage minus drop out voltage with less headroom."

So going from 15V to 12V is right on the edge.
by ricko
Thu Nov 12, 2020 9:52 am
Forum: Music Tech DIY
Topic: My LDO Regulator Distribution Board
Replies: 0
Views: 102

My LDO Regulator Distribution Board

Some other DIYers have written up their power supply adventures, so here is mine. Getting it all done was probably the least fun I have had in SDIY, one damn thing after another. But learning by doing has its place. Anyway, I wanted to supply a 3x 84HP Eurorack system for my wind controller. So, a 1...
by ricko
Thu Nov 12, 2020 8:08 am
Forum: Music Tech DIY
Topic: Case Wiring, two Meanwell RT-65B
Replies: 53
Views: 8189

Re: Case Wiring, two Meanwell RT-65B

Some semi-random comments. 1. First, be aware of this: https://www.asc.ohio-state.edu/physics/p616/safety/fatal_current.html 2. Also be aware that despite 1), DIY-ers living in countries with 250VAC 3-pin plug countries need to take different (more?) precautions/care than those in 110V countries 2pi...
by ricko
Tue Nov 10, 2020 3:44 am
Forum: Music Tech DIY
Topic: Birdwatchers' Guide to Moog/Thomas/Cordovox Satellite PCBs
Replies: 1
Views: 121

Re: Birdwatchers' Guide to Moog/Thomas/Cordovox Satellite PCBs

The main differences are the transistors and the VCF? section. For assembly years (right to left <- or top to bottom in pic, depending on rotation) 1974, 1975, 1976, 1976 5124, 252A, 5124, 5124 5115, bc173B, 5115, 5115 7335, 7438, 7608, 7425 7334, 7439, 7610, 7426 7335, 7424, 7614, 7425 The opamps a...
by ricko
Tue Nov 10, 2020 2:37 am
Forum: Music Tech DIY
Topic: Birdwatchers' Guide to Moog/Thomas/Cordovox Satellite PCBs
Replies: 1
Views: 121

Birdwatchers' Guide to Moog/Thomas/Cordovox Satellite PCBs

Here are 4 Satellite boards. This board was used in maybe 8 products from Moog Satellite and MinitMoog, but also put as an extra manual for Thomas and Cordovox organs. The two on the left/top have different VCFs (?) The bottom/right is dated 6-7-1974, and IIRC the seller told me it came from Moog Sa...
by ricko
Sun Nov 08, 2020 9:32 am
Forum: Music Tech DIY
Topic: Roland Sh-3A tuning
Replies: 3
Views: 115

Re: Roland Sh-3A tuning

If you are following the procedure, then F4 will never be sharp. Instead f1 and f4 will be true. You say your final result is f1=-3c f2=0 f3=+3 f4=+5. Doesn't that mean your scaling is a little too much? If your scaling was uniformly -3c per octave less, that would give you f1=0 f2=0 f3=0 f4=-1 Is y...
by ricko
Fri Oct 16, 2020 6:52 am
Forum: Modular Synth General Discussion
Topic: Annoying videos
Replies: 22
Views: 920

Re: Annoying videos

I get annoyed when just a single drone note gets played: what use is a sound if it doesnt inspire music? Also, sequenced demos with so much reverb and echo you get no sense of what is distinctive.
by ricko
Thu Oct 15, 2020 3:03 am
Forum: Music Tech DIY
Topic: OpenDeck DIY MIDI platform v5
Replies: 3
Views: 214

Re: OpenDeck DIY MIDI platform v5

Very impressive!
by ricko
Wed Oct 14, 2020 12:31 pm
Forum: Modular Synth General Discussion
Topic: Vibrato fade in?
Replies: 9
Views: 361

Re: Vibrato fade in?

3hands wrote:
Mon Oct 12, 2020 8:35 pm
Sorry, I couldn’t resist... haha
3A - the greatest automatic vibrato anywhere! speeds up, not just fades in.
by ricko
Mon Oct 12, 2020 6:08 pm
Forum: Music Tech DIY
Topic: Better shapes for 90 degree PCBs in popular shallow irregular skiff?
Replies: 10
Views: 356

Re: Better shapes for 90 degree PCBs in popular shallow irregular skiff?

All good points. I guess you would have to say "Max depth 41mm: suits skiffs with 1.65" depth; shaped and tested to fit in Moog 104, Behringer Go top rack, ...." etc And I guess another aspect is that if shallow-skiff users have to use ribbon buses, not boards, to distribute power, then it is best i...
by ricko
Mon Oct 12, 2020 7:14 am
Forum: Modular Synth General Discussion
Topic: What do ya do with S&H
Replies: 92
Views: 13701

Re:

Nice ideas above... Another cool thing is to clock a sample/hold with the gate output of either a keyboard (for manual playing) or a sequencer. Route the S/H output to a filter cutoff, or maybe an oscillator in an oscillator sync patch. This way you get a nice timbral shift with every new note that...
by ricko
Mon Oct 12, 2020 7:13 am
Forum: Modular Synth General Discussion
Topic: What do ya do with S&H
Replies: 92
Views: 13701

Re:

Nice ideas above... Another cool thing is to clock a sample/hold with the gate output of either a keyboard (for manual playing) or a sequencer. Route the S/H output to a filter cutoff, or maybe an oscillator in an oscillator sync patch. This way you get a nice timbral shift with every new note that...
by ricko
Mon Oct 12, 2020 6:57 am
Forum: Modular Synth General Discussion
Topic: Strings and saw waves
Replies: 97
Views: 5615

Re: Strings and saw waves

Some more pieces of info on VZVisions question on you see different frequency response curves that seemingly contradict. First, different graphs measure different things: they may measure internal pressure or displacement vibration rather than dB in the air. And their unuts and law and ranges can be...
by ricko
Sat Oct 10, 2020 7:23 pm
Forum: Music Tech DIY
Topic: Better shapes for 90 degree PCBs in popular shallow irregular skiff?
Replies: 10
Views: 356

Re: Better shapes for 90 degree PCBs in popular shallow irregular skiff?

Authorless. Skiffs are quite shallow. It is a problem to fit. Here is a video of a guy discovering that many of his modules that can fit into a Moog 104 will not fit into a Behringer 104 https://m.youtube.com/watch?v=5o8ro_42rW8 What the video does not show is how many modules cannot fit into a moog...
by ricko
Sat Oct 10, 2020 6:57 am
Forum: Music Tech DIY
Topic: Better shapes for 90 degree PCBs in popular shallow irregular skiff?
Replies: 10
Views: 356

Better shapes for 90 degree PCBs in popular shallow irregular skiff?

Some skiffs dont have a rectangular cavity: the Moogs and Behringers in particular. Using PCBs with some other shape than rectangles might allow more PCB area for modules, where the PCB is mounted 90 degrees to the panel, not in parallel. But what shape or rules of thumb might be good? It seems ther...
by ricko
Fri Sep 18, 2020 9:33 pm
Forum: Modular Synth General Discussion
Topic: Please tell me why lin/log response on VCAs is desirable!
Replies: 10
Views: 405

Re: Please tell me why lin/log response on VCAs is desirable!

I don't understand. Just read that Erica Synth released a new VCA with both "responses"(linear/logarithmic). But what does that really mean? You would need an envelope or whatever kind of signal to control it anyway, and you use that(envelope/whatever) to design the response don't you? Does it acce...
by ricko
Fri Sep 18, 2020 6:13 am
Forum: Modular Synth General Discussion
Topic: Alternate Front Panels: Get Permission?
Replies: 16
Views: 549

Re: Alternate Front Panels: Get Permission?

I think it is a little more complex. If the old design was really, really novel and distinctive in some way, then copyright could apply. For a panel design, that would have to be things that have not appeared in panels (including analog computerx and industrial panels before) . So Moog -like and ARP...
by ricko
Thu Sep 10, 2020 11:35 am
Forum: Eurorack Modules
Topic: Behringer ARP 2500 modules
Replies: 220
Views: 12600

Re: Behringer ARP 2500 modules

I have now had both @ricko and @KSS assume that I was arguing for the other's stance :hihi: --- I'm not trying to make claims about what an ARP does or doesn't do (because I have never used one), nor am I making claims about what the BARP does or doesn't do (because I have never used one). The thin...
by ricko
Wed Sep 09, 2020 7:09 am
Forum: Eurorack Modules
Topic: Behringer ARP 2500 modules
Replies: 220
Views: 12600

Re: Behringer ARP 2500 modules

@galanter2 Depends on the input. Some put a DC blocking cap there, some don't. You don't think that's significant when asking whether a DC offset is audible? What I'm suggesting is that the DC offset may not be intrinsically audible, but it is in some sense "out of spec" and the difference heard is...
by ricko
Wed Sep 09, 2020 7:08 am
Forum: Eurorack Modules
Topic: Behringer ARP 2500 modules
Replies: 220
Views: 12600

Re: Behringer ARP 2500 modules

(duplicate)
by ricko
Tue Sep 08, 2020 10:37 pm
Forum: Music Tech DIY
Topic: How to minimise unintended noise from a module intended to generate noise?
Replies: 3
Views: 172

How to minimise unintended noise from a module intended to generate noise?

On my bench now is a module that combines three transistor noise generators each with a (Quad style) tilt filter at a different cutoff. (So you can get different noise distributions than either using coloured noise or typical VCLPFs.) But, especially after Mungo's comment on another thread along the...
by ricko
Tue Sep 08, 2020 10:03 am
Forum: Eurorack Modules
Topic: Behringer ARP 2500 modules
Replies: 220
Views: 12600

Re: Behringer ARP 2500 modules

KSS wrote:
Tue Sep 08, 2020 2:48 am
@ricko
Noticed you skipped these. Didn't fit your narrative I guess.
No, they would fall in the first case I dealt with, that whatever they said, it could not mean they thought they were getting exactly an ARP 2500 (because it is clear from the pictures, etc.) Just the parts they cared about.
by ricko
Tue Sep 08, 2020 1:54 am
Forum: Eurorack Modules
Topic: Behringer ARP 2500 modules
Replies: 220
Views: 12600

Re: Behringer ARP 2500 modules

[...] No-one is buying it expecting the experience to be identical, nor probably care. Are you sure? I would have thought that people do just that in order to snigger at people who own the originals -- which will of course be rendered worthless by Behringer's highly authentic replicas. Stephen Rubb...
by ricko
Tue Sep 08, 2020 1:43 am
Forum: Eurorack Modules
Topic: Behringer ARP 2500 modules
Replies: 220
Views: 12600

Re: Behringer ARP 2500 modules

I spent some time yesterday reading Gearslutz parallel B2500 thread. I'm not a member there, but I do read it from time to time to keep up with the pulse of what people are saying. I suggest that anyone who thinks people do not expect these modules to give then "a 2500 they can afford" <--no additi...

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