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Modular synth madness

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Davesax1965 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: February 05 2019 at 10:32
Apparently there are some new ones being made. 

https://www.youtube.com/watch?v=02pHRIVvitw

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Post Options Post Options   Thanks (1) Thanks(1)   Quote Mascodagama Quote  Post ReplyReply Direct Link To This Post Posted: February 05 2019 at 04:21
Originally posted by Davesax1965 Davesax1965 wrote:

Side point, after WW1, Conn produced some special order saxes which could be played with one hand. The difficulty is if you lose your left hand, the action gets much more complex. It looks like some kind of explosion in a Meccano factory.

Since none have been produced since about 1920, I think I'll go easy with the angle grinder. ;-)

Awesome, and strangely touching. I had no idea.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: February 05 2019 at 01:29
Backboard with distribution strips ready to drill up and mount. 

Back when I've drilled 102 holes. 



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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: February 04 2019 at 09:08
Side point, after WW1, Conn produced some special order saxes which could be played with one hand. The difficulty is if you lose your left hand, the action gets much more complex. It looks like some kind of explosion in a Meccano factory.

Since none have been produced since about 1920, I think I'll go easy with the angle grinder. ;-)

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gerinski Quote  Post ReplyReply Direct Link To This Post Posted: February 04 2019 at 07:45
Sometimes it's not so much the threat of actually losing a finger or a piece of it, it's just that if you injure any of them it may prevent you from playing for a few days if not weeks. Musicians need always be careful with their fingers, same as singers need to be careful about their voice / throat.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mascodagama Quote  Post ReplyReply Direct Link To This Post Posted: February 04 2019 at 07:10
Originally posted by Davesax1965 Davesax1965 wrote:

Four more frames to cut, and we're getting there. Power tools make me paranoid, "musician and fingers" etc. ;-)
Guitarists seem to manage with less than a full complement of working fingers - Jerry Garcia, Tony Iommi. Pianist Horace Parlan developed his insanely funky style based on his left hand compensating for a right hand that was paralysed by polio. But I guess a sax player really would be screwed if a couple of fingers ended up on the workshop floor...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: February 04 2019 at 06:19
PS Two modules my brother's designed working together - oscillator and low frequency oscillator. 



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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: February 04 2019 at 05:59
:-) 

Those who the Gods destroy, they first make them build modular synthesizers. 

I'm actually thinking of issuing kit analogue synths. There are a very few out there, ranging from very simple designs to things like MFOS ones, which are "somewhat difficult to build" due mainly to the wiring. Which is sort of a spaghetti nightmare. My brother's designed a variety of modules and I've got a few home made designs: we've got enough to do a complete synth and the main impediment of building some kind of powered enclosure seems to be solved. Two options - (1) fully normalised or (b) with patch bay, which increases the complexity of the design and therefore the cost. I'd do it with large format size knobs and quarter inch jacks, less fiddly. No keyboard, MIDI in instead. It's very difficult to buy small batches of keybeds off the few manufacturers out there, who don't even respond to e-mails. You can plug a MIDI keyboard in, so that's the way to do it, saves building a keyboard diode matrix as well.

The main problem is that people with *zero* soldering experience tend to buy kits and then complain about them not working. It's a sort of weird Dunning Kruger effect, where someone can't wire a plug but think they can somehow build an analogue synth. Dreadbox issued a number of kits on a "no technical help" involved, you buy the kit, if it works, good, if it doesn't, tough. There are a number of options - (a) panel plus PCB, source your own parts (b) panel plus PCB plus parts included and (c) pre-made enclosure. One thing which should put off amateur fiddlers (but seemingly fails to do so) is that you can't build and calibrate an analogue synth without recourse to an oscilloscope. Yet still they blunder on. 

Instruction videos on YouTube - "get this PCB out, solder these components to it in this order, test, get the next PCB out" etc. The finished synth will be superior to any kit out there on the market, obviously nothing like the modulars I build, but obviously nothing like the price. It will still be fairly expensive, though. You can't make these things for nothing, but there's the option of buying it stage by stage, ie. oscillator PCB, mixer PCB, LFO PCB.... that conditions the design but makes it more affordable. Some kit synths are pure rip offs, but it'd be "as cheap as possible whilst making a reasonable profit."

The problem of doing this is, as usual, time and money. Yes, I've got the money to do it, but it's somewhat out on a wire, same with all specialised small businesses. I'd definitely avoid Kickstarters or (god forbid) angel investors. Time is the main factor, I rarely get a weekend off work, and the day job is not something I can afford to give up to do this. Let's see how it goes. 


Edited by Davesax1965 - February 04 2019 at 06:15

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Post Options Post Options   Thanks (1) Thanks(1)   Quote verslibre Quote  Post ReplyReply Direct Link To This Post Posted: February 03 2019 at 14:47
You madman!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: February 03 2019 at 10:41
Four more frames to cut, and we're getting there. Power tools make me paranoid, "musician and fingers" etc. ;-)

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: February 03 2019 at 10:39
Frames being cut to depth (with an angle grinder, a lot of finishing to do.)

So the frames bolt into the rack strip in the flight case. The individual modules screw into the frames and power comes from the bus boards to the modules via ribbon cables. A lot of work to do, but it all electrically works so far, it's just "arts and crafts" now. 



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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: February 03 2019 at 10:37
Case wiring started, all works. The green board at the top is a distribution board which sends power to the modules. The finished system will have six of these in. 

There's a large piece of ply coming on which I'll mount six bus boards - I then get a custom flightcase built - cut some frames back to length and !!! 20U cabinet done. 



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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: January 11 2019 at 10:07
Here's the Pitchblack Pro - rack version. I really need several of these. Drifting oscillators are the bane of analogue synths. Takes about 20-30 minutes for them to get to a stable temperature. Some voltage controlled oscillators have temperature control built into them.

Did I mention using this old stuff was a labour of love ? 



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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: January 11 2019 at 10:04
Korg MS-20 Mini with a wooden side kit by Drunken Woodworker, before anyone asks. I had an original MS-10 back in the early 80's.

The Pitchblack Pro tuner is a modern equivalent of the old Conn Strobotuner. I'd love an original Conn, but they go for silly money now. 

Strobotuner here.



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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: January 11 2019 at 06:25
Absolute essential for tuning oscillators...... a strobe tuner. This is a Korg Pitchblack Pro. 

Expect much swearing ahead. Ladies, cover your ears. ;-)



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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: January 11 2019 at 06:11
I have no idea why I deliberately make my life this complicated. ;-)

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: January 11 2019 at 06:10
Right, next step: build an 18U custom case. Or rather, get a custom flight case made for me. 

This is the zen of modular synth power. 

You've got frames, which the modules screw into. These are 19" rackmount jobbies, but there are standard non- rackmount frames available. Under the frames here are two "cheesegrater" power supplies which kick out 2.8 amps each, 12v DC. The feeds out are +12, -12, +5 and GND. 

You have an AC power inlet (IEC) which connects up to the power supplies (not shown). The power supplies kick out DC to the green PCBs, which are power distribution strips. (No wiring on here yet). The distribution strips - "bus boards" - have headers on them to connect the power to the modules via ribbon cables, again, not shown. 

All of this sits on a back board. I've got a bit of ply here, but the working board will be 2mm mild steel. The back board is insulated from the case (and AC in) by sitting it on square section aluminium. So, lots of cutting and drilling to do, which will result in lots of sailor language. After that, you switch the power on (hoping that you've not made any mistakes) - test the voltages and then plug the modules in with the right polarity, as reversing the +12 and -12v feeds has all kinds of nasty and expensive consequences. 

Job done after that. I'll have a couple of blank rows spare "for expansion purposes" - the real pain in the backside is calibrating all the oscillators, amps and filters in the synth. This can take AGES to set them up correctly. They're all tested and working, but getting them to sound right takes quite some considerable time and effort. 

Should be just insane when finished, though. 



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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: January 01 2019 at 09:10
A tiny example of just the sequencer section at work. This is not even scratching the surface of the sequencer boxes. 



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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: December 29 2018 at 03:08
Thus. And that's about half the setup. 


Edited by Davesax1965 - December 29 2018 at 03:10

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Davesax1965 Quote  Post ReplyReply Direct Link To This Post Posted: December 28 2018 at 08:10
Let there be Blinkenlight.





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