Search found 690 matches

by whoop_john
Tue Jun 14, 2022 2:31 am
Forum: Music Tech DIY
Topic: CR-78 Snare module
Replies: 91
Views: 12111

Re: CR-78 Snare module

Would any of you still have pcb's laying around, or could we have the pcb's made ourselves? Cheers, Mark I have amended the files and uploaded Gerbers for manufacturing to https://www.dropbox.com/s/90s1dmoana1yc26/Roland78%20gerbers.zip?dl=0 Roland CR-78 gerber files https://previews.dropbox.com/p/...
by whoop_john
Wed Apr 20, 2022 3:08 pm
Forum: Music Tech DIY
Topic: Did I just f**k up my Turing Machine?
Replies: 14
Views: 699

Re: Did I just f**k up my Turing Machine?

That's not a Turing Machine, this is a real working Turing Machine.

Image
by whoop_john
Wed Jan 12, 2022 5:44 pm
Forum: Music Tech DIY
Topic: [ORDER] OCTOGINTA-II Digisound 80-2 eurorack version
Replies: 101
Views: 15359

Re: [ORDER] OCTOGINTA-II Digisound 80-2 eurorack version

My cancer surgery is planned for 3rd Feb. It would be good to sell these before then, if anyone is interested. Otherwise it will probably be a six week delay before I can deal with it.
by whoop_john
Mon Jan 10, 2022 12:55 pm
Forum: Music Tech DIY
Topic: [ORDER] OCTOGINTA-II Digisound 80-2 eurorack version
Replies: 101
Views: 15359

Re: [ORDER] OCTOGINTA-II Digisound 80-2 eurorack version

Hello people. I am being challenged with oesophageal cancer, hence I've been out of the loop. Julian of thebeast.co.uk milled and silkscreen printed some lovely black anodised panels for me. I have just three sets of panels and PCBs surplus. If I take a turn for the worse I'll make sure Julian has t...
by whoop_john
Fri Nov 05, 2021 5:19 pm
Forum: Music Tech DIY
Topic: A "switched integrator" VCO core
Replies: 204
Views: 4986

Re: A "switched integrator" VCO core

You could also look at the basic core of the ETI4600 / ETI 5600S synths, which generate a two switch triangle as the basic VCO form, although it is linear, not log. Needs a Hz/V input.
by whoop_john
Fri Oct 22, 2021 1:43 am
Forum: Music Tech DIY
Topic: virtual tools
Replies: 2
Views: 181

Re: virtual tools

Any links to the latter project? A Google search gives me mainly links to iFixit or component boxes.
by whoop_john
Wed Oct 13, 2021 10:24 pm
Forum: Music Tech DIY
Topic: Gerber file help needed
Replies: 16
Views: 523

Re: Gerber file help needed

Unfortunately, I do not own or know how to use any other PCB design software. Can somebody help and correct my gerber files for the cutout? You can upload and check your Gerbers online, from the people who own the de facto Gerber format here: https://gerber.ucamco.com/ I also like to visually check...
by whoop_john
Wed Sep 01, 2021 4:51 am
Forum: Music Tech DIY
Topic: Front panel legend techniques
Replies: 35
Views: 2010

Re: Front panel legend techniques

A shout out for Meface, if you are in the UK. Cheap set prices for 3U 4U and 5U panels, per HP. See https://www.meface.co.uk/analog-digital-modular-synthesizer-front-panels/ Meface say they are happy to ship to US or Canada, which takes 1-3 days. But to Italy or Germany it can take 3 weeks, because ...
by whoop_john
Sat Aug 21, 2021 2:58 pm
Forum: Music Tech DIY
Topic: Backlit Epoxy Blanks - Seeking Circuit Knowledge
Replies: 13
Views: 585

Re: Backlit Epoxy Blanks - Seeking Circuit Knowledge

I make bicolo(u)r LEDs that fit inside a 3.5mm jack. These respond to positive and negative going voltages and in the case of high frequencies they do the same, but the swiftness of the changes deceives the eye, so appear to be a mix of the two colo(u)rs. So just mount an input on the front panel an...
by whoop_john
Fri Aug 20, 2021 1:55 am
Forum: Music Tech DIY
Topic: Backlit Epoxy Blanks - Seeking Circuit Knowledge
Replies: 13
Views: 585

Re: Backlit Epoxy Blanks - Seeking Circuit Knowledge

I like this idea very much. There exists a variety of exotic LEDs, such as slow colo(u)r change. I think if you bought some of the two-lead bicolo(u)r leds, then they would light one colo(u)r with a positive going voltage and the other colo(u)r with a negative voltage. Fed with an oscillator you wil...
by whoop_john
Wed Aug 18, 2021 2:43 am
Forum: Music Tech DIY
Topic: Should we have a Danger light?
Replies: 28
Views: 1389

Re: Should we have a Danger light?

On my Euro bus strips I've added a PTC resettable fuse every three sockets on the +12v and -12v rails. When a short circuit occurs, the fuse heats up and goes from a low resistance state to a high resistance state, killing power to the modules. Allowing them to cool down by removing the power resets...
by whoop_john
Wed Aug 18, 2021 2:27 am
Forum: Music Tech DIY
Topic: Should we have a Danger light?
Replies: 28
Views: 1389

Re: Should we have a Danger light?

If you live in 240 volt land, then neon indicators are a good solution to show if the mains is correctly wired. Each lamp will only light if the correct voltage is present across the combination of resistors. Should the mains voltage be too low, then the neons will not light. 4511a.gif Nota bene: th...
by whoop_john
Fri Jul 02, 2021 3:03 pm
Forum: Music Tech DIY
Topic: Front panel legend techniques
Replies: 35
Views: 2010

Re: Front panel legend techniques

Regarding Inkscape on Apple Mac, I am having serious issues with it regarding importing SVG files or PDFs. It is converting the CMYK colo(u)rs to an rgb model, so the pure black in the CMYK file is smearing across all the colours, to produce a black in the K channel that is about 72%. Julian over at...
by whoop_john
Sat Jun 26, 2021 9:04 am
Forum: Music Tech DIY
Topic: I think I`m building a synthesizer.
Replies: 144
Views: 6115

Re: I think I`m building a synthesizer.

My best bit of advice with an electric jigsaw is to check the blade is at 90º to the base plate before cutting. When you do cut, let the saw do the cutting, not you doing the pushing. If you push, the blade tends to sway to one side or the other. So use a good a fresh blade and take your time with t...
by whoop_john
Mon Jun 14, 2021 12:23 pm
Forum: Music Tech DIY
Topic: Eurorack PCB faceplate
Replies: 14
Views: 902

Re: Eurorack PCB faceplate

I am trying to design a PCB faceplate for my modules, but I am new to PCB design and I have some questions. The design: https://i.imgur.com/6O8IE8m.png When I upload it to JLCPCB, in the analyis section there are some exclamation mark. I don't know, that it's just a warning, or I have an issue with...
by whoop_john
Mon Jun 14, 2021 6:32 am
Forum: Music Tech DIY
Topic: History of Synth DIY: Opinions requested
Replies: 119
Views: 6503

Re: History of Synth DIY: Opinions requested

It seems as if we need at least a US timeline, a European timeline and an Australian timeline, as all these had different threads. It's probably a Hydra-headed monster.
by whoop_john
Mon Jun 14, 2021 6:26 am
Forum: Music Tech DIY
Topic: History of Synth DIY: Opinions requested
Replies: 119
Views: 6503

Re: History of Synth DIY: Opinions requested

If we're including names then Tim Orr has to come on it. Numerous magazine articles and projects, all of which worked rather then needing major reworking as many other authors' designs did. He also worked for EMS and Akai, where he produced some of the worst synth colour schemes in history :-) Agre...
by whoop_john
Sat Jun 12, 2021 6:30 pm
Forum: Music Tech DIY
Topic: History of Synth DIY: Opinions requested
Replies: 119
Views: 6503

Re: History of Synth DIY: Opinions requested

Well OK, but if you are talking about UK Modular, which does not include ANY of the above projects, as they were essentially pre-configured synths, Read the OP again. "We want to use it to create a synth-DIY 'timeline' of sorts." No mention of having to be modular, and indeed most DIY syn...
by whoop_john
Sat Jun 12, 2021 4:59 pm
Forum: Music Tech DIY
Topic: History of Synth DIY: Opinions requested
Replies: 119
Views: 6503

Re: History of Synth DIY: Opinions requested

From a British point of view, Synth DIY was helped along considerably by these three series of articles : Practical Electronics : http://www.timstinchcombe.co.uk/index.php?pge=pemini#pess Wireless World : http://yusynth.net/archives/WirelessWorld/Electronic-sound-Synthesizer.pdf ETI : https://encyc...
by whoop_john
Mon May 17, 2021 2:57 pm
Forum: Music Tech DIY
Topic: 5-way splitter
Replies: 3
Views: 489

Re: 5-way splitter

Did you just reinvent a 5 way version of the very cheap 6 way splitter, available easily from many sources? Image
by whoop_john
Wed Mar 24, 2021 12:36 pm
Forum: Music Tech DIY
Topic: SPDT (on)-off-on toggle switch sources
Replies: 13
Views: 1310

Re: SPDT (on)-off-on toggle switch sources

thanks for the Ali tip! I didn't find a "sub mini" size for the (ON)-OFF-ON SPDT switch, but that's fine really. Seems uncommon. I gave you a link directly to the Aliexpress item - it's https://www.aliexpress.com/item/32759244103.html . It is submini. The height of the body is 7.5mm high.
by whoop_john
Tue Mar 23, 2021 10:51 pm
Forum: Music Tech DIY
Topic: SPDT (on)-off-on toggle switch sources
Replies: 13
Views: 1310

Re: SPDT (on)-off-on toggle switch sources

I'm having a hard time source a sub mini SPDT (ON)-OFF-ON toggle switch for eurorack. I've found a nice one on Farnell, but they want my VAT number, and i don't have one. the same goes for RS and Mouser. they all want my VAT number, so i'm unable (it seems) to buy anything from them. :deadbanana: :...
by whoop_john
Sun Feb 28, 2021 3:38 pm
Forum: Music Tech DIY
Topic: Turing machine front end
Replies: 3
Views: 327

Turing machine front end

155517867_1422952048045403_8308517665498560272_o.jpg
by whoop_john
Tue Dec 29, 2020 12:27 am
Forum: Music Tech DIY
Topic: A joystick schematic acceptance
Replies: 10
Views: 626

Re: A joystick schematic acceptance

If you want there to be a middle dead zone where the voltage doesn't change, a couple of back-to-back diodes in parallel before the op-amp input is a good idea.

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