Search found 666 matches

by whoop_john
Tue Dec 29, 2020 12:27 am
Forum: Music Tech DIY
Topic: A joystick schematic acceptance
Replies: 10
Views: 359

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: 176

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 - AUDIO DEMO
Replies: 86
Views: 4804

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: 525

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: 525

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: 525

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.
by whoop_john
Wed Jul 29, 2020 6:39 am
Forum: Music Tech DIY
Topic: Cheap pot caps for cheap pots
Replies: 11
Views: 525

Cheap pot caps for cheap pots

I don't know if any of you use this style of pot which has a plastic shaft and screwdriver slot. I was looking for something to make them look a little better and found these caps on Aliexpress in the Jewellery section. They are shiny stainless steel. While not very deep, they do cap the knobs off w...
by whoop_john
Tue Jul 14, 2020 2:29 am
Forum: Music Tech DIY
Topic: [Project] Turing Machine Mk2
Replies: 554
Views: 56308

Re: [Project] Turing Machine Mk2

What a real Turing machine looks like…
Array Cell Address Check_2.jpg
by whoop_john
Fri Jun 26, 2020 3:15 pm
Forum: Music Tech DIY
Topic: MIDI - CV options?
Replies: 9
Views: 524

Re: MIDI - CV options?

I have a pair of Eurorack Modular Solos from Kenton. Not cheap, but full of useful features you won't find anywhere else and professional studio quality. Recommended.

https://kentonuk.com/product/modular-solo/
by whoop_john
Fri Jun 19, 2020 3:53 am
Forum: Music Tech DIY
Topic: What is wrong with my Baby8?
Replies: 6
Views: 366

Re: What is wrong with my Baby8?

Kristian has a youtube series on the Baby 8 and links to schematics. Perhaps these would help you? Baby 8 Sequencer on Youtube.
by whoop_john
Sun Jun 14, 2020 6:31 am
Forum: Music Tech DIY
Topic: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD
Replies: 203
Views: 9898

Re: OPERA ROTAS, a DIY mutant drum machine

Great... I didn´t know about the opera molas version. I thought opera rotas was the only know magic square in existence :D So this is for invoking femenine spirits? Juicy... There are a few more magic squares of this nature. Scope here for naming your future projects. https://i.imgur.com/Rwmnl4L.jpg
by whoop_john
Sat Jun 13, 2020 3:04 pm
Forum: Music Tech DIY
Topic: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD
Replies: 203
Views: 9898

Re: OPERA ROTAS, a DIY mutant drum machine

Or perhaps the other version:

SALOM
AREPO
LEMEL
OPERA
MOLAS

Coming under the rule of Venus, this is used to obtain the love of a maiden. What kind of QBListic magik is this infernal device of which you speak?
by whoop_john
Sat Jun 13, 2020 3:01 pm
Forum: Music Tech DIY
Topic: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD
Replies: 203
Views: 9898

Re: OPERA ROTAS, a DIY mutant drum machine

Isn't the full version:

SATOR
AREPO
TENET
OPERA
ROTAS

The Greater Seal of Solomon, under the influence of Saturn. Will it work if you only use part of the spell?
by whoop_john
Tue May 12, 2020 11:32 am
Forum: Music Tech DIY
Topic: System700 clone: 14,4V
Replies: 3
Views: 292

Re: System700 clone: 14,4V

Hello, on the yusynth website I found several interesting System 700 schematics: http://yusynth.net/gear/R700_MC_en.html For example the VCA 704A/B required 14,4v for the LED control: http://yusynth.net/gear/ROLAND/R700-schematics/704-ABCD-VCA.pdf How can i generate the 14,4v? Or it works also with...
by whoop_john
Mon May 11, 2020 2:47 pm
Forum: Music Tech DIY
Topic: Std Res resistors
Replies: 11
Views: 511

Re: Std Res resistors

KSS wrote:
Sun May 10, 2020 2:43 pm
Good idea. There are quite a few here who have dealt with the Maplin 38,46,5600 synths.
Yes I built both a 4600 and a 5600s back in the day. Let me know if you get stuck.
by whoop_john
Tue May 05, 2020 7:39 am
Forum: Music Tech DIY
Topic: The horror of "PCB pattern is 1/4 normal size"
Replies: 13
Views: 904

Re: The horror of "PCB pattern is 1/4 normal size"

Graphic designers and artists used Grant Enlargers to scale up artwork. You can Google them. They weren't cameras, just a mechanical machine with a lens. You put your original on the bottom under the lens, focused it up onto a glass plate where it could be traced over by hand. Art schools had them, ...
by whoop_john
Tue May 05, 2020 7:29 am
Forum: Music Tech DIY
Topic: The horror of "PCB pattern is 1/4 normal size"
Replies: 13
Views: 904

Re: The horror of "PCB pattern is 1/4 normal size"

If your question is about how did we get hobby artwork to the right size in the first place, in the UK there were companies that specialised in providing the PCBs for published projects, so we simply bought them. For the ETI 4600 and 5600S synths Maplin sold all the PCBs. For the ETI 4600 full-sized...
by whoop_john
Tue May 05, 2020 7:19 am
Forum: Music Tech DIY
Topic: The horror of "PCB pattern is 1/4 normal size"
Replies: 13
Views: 904

Re: The horror of "PCB pattern is 1/4 normal size"

I use Photoshop. Nice information. But the question is what you did before modern software solutions existed? Well I once worked in printed circuit board factory. I'd prepare a film positive by placing sticky pads on acetate over a design drawn on paper with crepe tape to lay down the trackwork. Or...
by whoop_john
Mon May 04, 2020 11:55 am
Forum: Music Tech DIY
Topic: The horror of "PCB pattern is 1/4 normal size"
Replies: 13
Views: 904

Re: The horror of "PCB pattern is 1/4 normal size"

I use Photoshop. There are usually some components that are on a 0.1" grid. I take the scan into Photoshop and make the grid. 0.1" and show grid. I then go into Image>Image size and without 'Resample Image', adjust the ppi, pixels/inch, until the grid matches up with the 0.1" grid. I use Osmond PCB ...
by whoop_john
Sat May 02, 2020 10:58 am
Forum: Music Tech DIY
Topic: Sine wave circuit issues on CEM3340
Replies: 17
Views: 852

Re: Sine wave circuit issues on CEM3340

Glad you got fixed. I am sorry I was unable to help myself. I am not able to access my builds and documentation right now.
by whoop_john
Fri Apr 17, 2020 4:08 pm
Forum: Music Tech DIY
Topic: 1-a-day project
Replies: 64
Views: 5004

Re: 1-a-day project

Hi Julian, I know your quality is excellent and the accuracy is really spot-on, but your camera doesn't show your panels in their best light.

I have various examples of Julian's front panels and they look way better than the snapshots he shows.
by whoop_john
Mon Apr 13, 2020 3:22 am
Forum: Music Tech DIY
Topic: 3D printed eurorack panels
Replies: 20
Views: 862

Re: 3D printed eurorack panels

Adding a gusset where the deep part of the panel joins the flat part will increase stiffness. Even a thin web -to preserve panel width in this area- will be better than the short overlap shown in the original. I did a number of experiments on my cheap 3D printer and got some surprisingly successful...
by whoop_john
Fri Apr 03, 2020 3:34 pm
Forum: Music Tech DIY
Topic: 1-a-day project
Replies: 64
Views: 5004

Re: 1-a-day project

Julian, you fill a niche that there is certainly a demand for. Your work is top quality and your attention to detail is really old skool. People, the bitter taste of a job gone wrong lasts a lot longer than the sweet taste of a cheap job. Yet Julian does seem to be able to give the likes of Schaeffe...
by whoop_john
Mon Mar 16, 2020 7:56 am
Forum: Music Tech DIY
Topic: ETI Maplin 4600 CV/Gate in?
Replies: 6
Views: 466

Re: ETI Maplin 4600 CV/Gate in?

.
by whoop_john
Mon Mar 16, 2020 7:21 am
Forum: Music Tech DIY
Topic: ETI Maplin 4600 CV/Gate in?
Replies: 6
Views: 466

Re: ETI Maplin 4600 CV/Gate in?

I just had a reply from John at Kenton. I've replied sending him the transient schematic, so I expect he'll get back to me with a good solution. ---snip snippety snip from Kenton--- There is a setting on most of our converters that allows you to send a trigger of up 10V for Pro-Solo / 12.7V for Pro-...

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