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powering dotcom modules via cotk
MUFF WIGGLER Forum Index -> 5U Format Modules  
Author powering dotcom modules via cotk
Klangzaun
I want to put 2 synthesizers.com modules (15V) into my club of the knobs expansion case. A precision power adapter is installed and if I see it right, there are to connectors which can deliver 15V. Has anybody experience with this? Do I just have to set the jumpers 1 pin down and connect the modules?

Please see the picture as reference.

cotk powerboard
tongebirge
I would ask COTK.
Synthesizers.com use another conector too.
Moon Modules have both dotcom and COTK conector.
Klangzaun
Thanks. The 2 white connectors are different to the cotk connectors. (The given link in the initial threads guides to the picture.

I wrote to Kazike some days ago, but no reply so far.
tongebirge
Take a Look at the sticky Power Distribution Thread here in the 5U Forum.
Klangzaun
Seems I have missed it, I will search for it...
Klangzaun
I don't see a solution there, I will post there.
JohnLRice
I've never had one of those distribution adapter boards but I'm pretty sure you won't get +-15v out of it unless you are feeding the board +-15v initially, regardless of how the jumpers on the two special power connectors are set.

Those are simple power regulators on that board and not designed to increase voltage. The jumpers on the two special power connectors probably bypass the regulator circuits so if your power supply is producing +-15v it will work?



You should get a digital multi meter (DMM) so you can measure what voltage in coming out of your power supply and into the adapter board and also check what affect moving the jumpers will have.

You could also try PMing wiggler phaedra since he has a lot of COTK gear (I think he is their main beta tester?) and he is relatively local to you also (in Germany).

Which Synthesizers.com modules are you wanting to connect? You are probably aware of this but some of them do require a +5v rail also to work correctly.
Klangzaun
Thanks for your help and drawing my attention to the +5V thematic.

Actually my powerboard looks not as shown in the pictures you have posted. It looks like this:

https://www.dropbox.com/s/usyv7swugy7a89l/20170731_Kreativsicht_15364. jpeg?dl=0

I bought the expansion case 2nd hand and the seller mixed modules there as well. I have asked him as well.

I want to install the Q142 pedal interface and the Q173 gate math.

I try to contact phaedra. I think I know him from a German synth forum...
Leverkusen
CotK Systems actually run on a +/- 15V PSU. Power is regulated down then to +/12V on the distribution boards.

The boards carry two switchable connectors because some of the CotK modules (the frequency shifter, ensemble generator and one of the phasers) run on +/- 15V.

This particular system carries a 6-pin dotcom connector on the distribution board, which is not switchable but always distributes +/- 15V. When you look carefully at the pics from the CotK technical site you see the footprint for the dotcom connector on one end of the distribution board.
Leverkusen
You would use something like this to connect a dotcom module - it would not need all cables though since this is an inter-board connector from an Oakley module:



Of course you could make a similar adapter for one of the switchable connectors or with Y-cabling to connect more then one dotcom module...
JohnLRice
hmmm..... Actually the circuit in the picture you posted and the one I posted from the COTK site are very identical, just some color and style changes (red vs black jumpers, black clamping output connectors vs white non-claping ones, red box caps vs red ones etc) cool




The Q142 doesn't need a +5v rail but the Q173 does ( +5V@50ma) so you'll need to handle that somehow.
Leverkusen
...and yes, you have to set the jumpers one pin down to switch to +/-15 V. Both of them (plus and minus) for one connector.

Also there are some 12V - 5V regulators around in eurorack (Deopfer has one). You could just include one of those and include it in some DIY dotcom power harness.

thumbs up
Klangzaun
Leverkusen wrote:
This particular system carries a 6-pin dotcom connector on the distribution board, which is not switchable but always distributes +/- 15V. When you look carefully at the pics from the CotK technical site you see the footprint for the dotcom connector on one end of the distribution board.


Thanks for jumping in. :-)

I understood that I shouldn't use the 2 white connectors at all with making a special cable. And even with a adapter the +5V things isn't solved. I learned I should use the extra connector on the very right side and look for a matching adapter. Still the 5V issue is unsolved.

Meanwhile Leverkusen recommended to use a Doepfer 5V adapter. May I will go for this.

Alternatively I consider to order a Box 2 or Box 4 from dotcom.
JohnLRice
Klangzaun wrote:
Alternatively I consider to order a Box 2 or Box 4 from dotcom.
While this would be easy and possibly allow for further expansion hyper if you want to keep everything in the same case you could just get their QPS2 power supply if there is an easy way for you to pass the AC power cable in and mount the power brick inside the case?
https://www.synthesizers.com/qps2.html


Tony at Analog Craftsman also sells a similar power brick:
http://analogcraftsman.com/?product=acpsu

and if you also got one of his nice little distro boards
http://analogcraftsman.com/?product=acbus

he could probably setup the wiring for you.
Don't forget to get a couple power cables if you do this.
http://analogcraftsman.com/?product=accable
Or ask him if he can just wire a few power cables right to the power brick so it's just like the DotCom one?

Or . . if you want to go with a small external case consider the Moon Modular M500 T4 Tabletop Case since you are in Germany and it may cost the same or less than a similar DotCom one. Plus you'll get it faster if it's in stock!
http://www.lunar-experience.com/cases.html

Schneidersladen is waiting on more stock to arrive:
https://www.schneidersladen.de/en/moonmodular-t4.html
Klangzaun
Thanks for giving me the sources. I will check all and decide....
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