Search found 685 matches

by whoop_john
Fri Oct 22, 2021 1:43 am
Forum: Music Tech DIY
Topic: virtual tools
Replies: 2
Views: 142

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: 363

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: 1570

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: 489

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: 489

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: 1285

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: 1285

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: 1570

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: 4718

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: 650

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: 5149

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: 5149

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: 5149

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 synths in the...
by whoop_john
Sat Jun 12, 2021 4:59 pm
Forum: Music Tech DIY
Topic: History of Synth DIY: Opinions requested
Replies: 119
Views: 5149

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: 410

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: 1099

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

htor wrote:
Wed Mar 24, 2021 8:10 am
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: 1099

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: 295

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: 568

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.
by whoop_john
Sat Dec 19, 2020 3:16 pm
Forum: Music Tech DIY
Topic: Help with MIDI wiring/switching
Replies: 6
Views: 335

Re: Help with MIDI wiring/switching

Midi merger? Didn’t know that word but it makes sense. Thanks, learned something today :tu: MIDI merging seems easy, until you realise you have to arbitrate if you get conflicting MIDI clock pulses from two or more sources at once, or you have a synth that sends running status, in which case you ha...
by whoop_john
Tue Dec 08, 2020 3:47 pm
Forum: Music Tech DIY
Topic: PROGUE - Analog mono synth - Available!
Replies: 298
Views: 19233

Re: PROGUE - Analog mono synth - AUDIO DEMO

I am happy with SMD. Go with it.
by whoop_john
Sun Aug 16, 2020 4:13 pm
Forum: Music Tech DIY
Topic: Cheap pot caps for cheap pots
Replies: 11
Views: 739

Re: Cheap pot caps for cheap pots

How much do you people perspire? These are perhaps for ambient chill use only then. Seriously, they are going to be absolutely fine for me - I don't need vice grips to get them to turn. I'll ask my Chinese medicine practitioner and martial art teachers about the chrome and vanadium. This is an amaz...
by whoop_john
Thu Jul 30, 2020 12:03 am
Forum: Music Tech DIY
Topic: Cheap pot caps for cheap pots
Replies: 11
Views: 739

Re: Cheap pot caps for cheap pots

Sandrine wrote:
Wed Jul 29, 2020 1:58 pm
Haha! I like them! I have been using a 3D printer to knob those but these look so much nicer, I'm getting some
BTW which ones? 5 or 6mm?
I bet those 3mm's would work for 6x6 push button covers wow
I bought the 6mm internal diameter caps. Good idea about the 3mm ones for tactile buttons, Sandrine.
by whoop_john
Wed Jul 29, 2020 1:33 pm
Forum: Music Tech DIY
Topic: Cheap pot caps for cheap pots
Replies: 11
Views: 739

Re: Cheap pot caps for cheap pots

How much do you people perspire? These are perhaps for ambient chill use only then. Seriously, they are going to be absolutely fine for me - I don't need vice grips to get them to turn. I'll ask my Chinese medicine practitioner and martial art teachers about the chrome and vanadium.

Go to advanced search