SEDECIM - the 16 note + gate euro module

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whoop_john
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SEDECIM - the 16 note + gate euro module

Post by whoop_john » Tue Feb 06, 2018 10:42 am

I have just finished a little 16 note keyboard and gate module in 4HP euro format. I am posting to see if there is any interest in this useful little module. If so I will order enough PCBs to go around. Cost will be £5 GBP plus shipping. If there is demand for it I may also put together complete kits if that is what people would like, saving all that sourcing of parts.

I will produce a full BOM and construction details in due course. There is no hand-wiring, it's in two plug together PCBs and forms a robust unit.

Julian has kindly expressed an interest in cutting front panels for this.

The circuit is similar to the CGS pedalboard/mini keyboard and uses a 4x4 switch matrix IC with an R/2R resistor ladder DAC. Any selected note is held indefinitely, while a gate is output for the duration of a button press.

The notes are laid out as a mini-piano, from C to D#. The panel pot tunes to over an octave lower or octave higher, but could be made more or less sensitive by changing one resistor. I found it useful to set the front pot so it's central position outputs 1v when the lower C is pressed.

The gate voltage can also be easily changed from 0-5v to 0-10v by means of an on-board resistor divider.

I've called the module the SEDECIM, latin for 16.

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av500
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Post by av500 » Tue Feb 06, 2018 11:05 am

yay, I knew stockpiling 74C922 would one day pay off!

seriously, this chip is mega obsolete...

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whoop_john
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Post by whoop_john » Tue Feb 06, 2018 12:06 pm

av500 wrote:yay, I knew stockpiling 74C922 would one day pay off!

seriously, this chip is mega obsolete...
I bought a bunch of them recently without any problems whatsoever. I will be happy to supply tested chips.
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Isaiah
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Post by Isaiah » Tue Feb 06, 2018 12:33 pm

Looks great! I’m interested.
What’s the diameter of the mounting holes?

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Post by Ayab » Tue Feb 06, 2018 12:37 pm

Hi Whoop-John

Put me down for a set pls - great design and very useful

General Info:-
The 74C922 IC is available from UT Source (£2.30 inc.postage) and several Aliexpress vendors for i.e. £1.88 for 5 units.

My favourite electronics store Cricklewood Electronics has 74C922 too - a bit more expensive but their components are reliable quality, in my experience.
Last edited by Ayab on Tue Feb 06, 2018 1:22 pm, edited 1 time in total.

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julian
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Post by julian » Tue Feb 06, 2018 12:51 pm

John is going to send me the panel data and ill lay out a front panel for the job.

I have enough space on a run toward the end of the week to cut a couple of demo panels. When theyre done, ill take some snaps, and post up here.

Cost will be the same as usual (normalised for panel width)

Thank you - i think it looks like a great module, and, surprisingly, im unsure of another similar on the market?
.



_________

For stocked euro / buchla / midibox see - http://thebeast.co.uk/?post_type=product

For custom cnc engraved panels see - http://thebeast.co.uk/?page_id=21

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Post by whoop_john » Tue Feb 06, 2018 12:52 pm

Isaiah wrote:Looks great! I’m interested.
What’s the diameter of the mounting holes?
2mm mounting holes, M2. I used M2 x 11mm threaded spacers between boards.

The buttons are 5.8mm square, available from various sources. Caution, these are available in locking and momentary versions, this uses the momentary version. The round buttons are 5.9mm diameter and also come in other colours - I also have red and grey here.

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av500
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Post by av500 » Tue Feb 06, 2018 3:31 pm

whoop_john wrote:
av500 wrote:yay, I knew stockpiling 74C922 would one day pay off!

seriously, this chip is mega obsolete...
I bought a bunch of them recently without any problems whatsoever. I will be happy to supply tested chips.
damn, there goes my retirement plan :deadbanana:

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Post by csaban » Tue Feb 06, 2018 4:14 pm

I'm interested as well!

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maltemark
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Post by maltemark » Tue Feb 06, 2018 6:09 pm

Colour me interested

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Morphology
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Post by Morphology » Wed Feb 07, 2018 3:48 am

I'm interested in 1 set of PCB & Front panel, plus a 74C922 IC.


Morph
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Post by nigel » Wed Feb 07, 2018 6:41 am

julian wrote:Thank you - i think it looks like a great module, and, surprisingly, im unsure of another similar on the market?
I immediately thought of the Barton panel keyboard module, but that's obviously much less polished. it also uses a PIC rather than discrete logic (although the 922 is a fairly chunky chip to be called discrete).

Compactness is obviously the point of the module, but I wonder how easy it is to press the key / button you're aiming for? They're very closely packed.

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Post by julian » Wed Feb 07, 2018 8:48 am

I suspect that you wont be playing a bass line on it, but for simple use, i think it will be fine.

Ive asked John about spacing out the scale a little more, as it would make my job cutting the panel easier, but it seems that its probably not doable.
.



_________

For stocked euro / buchla / midibox see - http://thebeast.co.uk/?post_type=product

For custom cnc engraved panels see - http://thebeast.co.uk/?page_id=21

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julian
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Post by julian » Wed Feb 07, 2018 2:28 pm

Image

Odd looking panel! : )

Ill do the engraving layer tomorrow.
.



_________

For stocked euro / buchla / midibox see - http://thebeast.co.uk/?post_type=product

For custom cnc engraved panels see - http://thebeast.co.uk/?page_id=21

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Post by shiftr » Wed Feb 07, 2018 3:03 pm

I would like 1 :)

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Post by av500 » Thu Feb 08, 2018 12:24 am

might as well use my 922s, I'm in for two

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Post by flts » Thu Feb 08, 2018 2:46 am

nigel wrote:
julian wrote:Thank you - i think it looks like a great module, and, surprisingly, im unsure of another similar on the market?
I immediately thought of the Barton panel keyboard module, but that's obviously much less polished.
And if we include non-DIY modules as "on the market", from the top of my head there are at least these from Doepfer and Ladik:

http://www.doepfer.de/A1731.htm
http://ladik.ladik.eu/?page_id=888
Warm thank you to everyone for the past 10 years. I'm not active here anymore for personal reasons, so for those I've had the pleasure of dealing with please send an e-mail instead of PM if you wish to get in touch.

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julian
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Post by julian » Thu Feb 08, 2018 3:02 am

Seems there are more about than i thought (but not that many more!)

Years ago i planned to make a larger euro unit (for myself) using, i think, ray wilsons board. I even purchased the board, and did the panel, but it never actually got finished : (

Even though people have pointed out a few, im still surprised theyre not more common.
.



_________

For stocked euro / buchla / midibox see - http://thebeast.co.uk/?post_type=product

For custom cnc engraved panels see - http://thebeast.co.uk/?page_id=21

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Post by flts » Thu Feb 08, 2018 3:04 am

Of course there are a bunch of touch panel keyboards aside those, both DIY and commercial - not many / all of them follow the piano keyboard layout though, if that's a specific requirement, and ones with mechanical buttons are actually more rare than touchplate ones it would seem...
Warm thank you to everyone for the past 10 years. I'm not active here anymore for personal reasons, so for those I've had the pleasure of dealing with please send an e-mail instead of PM if you wish to get in touch.

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Post by julian » Thu Feb 08, 2018 3:07 am

I should probably be quiet - im out of touch - ive not purchased a commercial module, either new, or, indeed, used, in, well, years!
.



_________

For stocked euro / buchla / midibox see - http://thebeast.co.uk/?post_type=product

For custom cnc engraved panels see - http://thebeast.co.uk/?page_id=21

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nocone
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Post by nocone » Thu Feb 08, 2018 12:23 pm

need one

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julian
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Post by julian » Fri Feb 09, 2018 3:30 am

Order page for panels -

viewtopic.php?t=196138&start=0&postdays ... highlight=

John is away for a couple of days, so i would have to confirm with him, but i would imagine that the panels and pcbs could be sent out in single packages to assist with postal cost, if that were of benefit.
.



_________

For stocked euro / buchla / midibox see - http://thebeast.co.uk/?post_type=product

For custom cnc engraved panels see - http://thebeast.co.uk/?page_id=21

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Post by NS4W » Fri Feb 09, 2018 5:13 am

Cute lil Mozart! :party:

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Post by whoop_john » Fri Feb 23, 2018 11:31 am

I have now received examples of Julian's front panels. Between us we shall make available one stop shopping to avoid several lots of shipping.

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See Julian's panel ordering thread for more details at https://www.muffwiggler.com/forum/viewtopic.php?t=196138

If anyone would like PCBs, could they please message me, as I am about to order further PCBs and would like to gauge how many to order. The cost in GBP will be £5.00 a set of two PCBs, plus shipping. UK is £1.50 and non-UK £3.50.

Thanks to all those who have expressed interest in this project, it makes it worthwhile for everybody and I can keep costs down if there is economy of scale.

All the parts are easily sourced, but if people are put off by having to order all the bits in, then please express your interest in a kit or perhaps I may even offer ready-built modules, but obviously there would be a charge for the build.
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Post by 4floorsofwhores » Fri Feb 23, 2018 3:39 pm

whoop_john
I'd love a couple of pcbs, panels and 74C922
what a great looking project
Careful now

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