[sdiy] Keyboards good for scrap / repurposing?

Ullrich Peter Peter.Ullrich at kapsch.net
Mon Feb 19 16:14:24 CET 2018


Hi Mark!

You could buy them here for example:

https://www.amplifiedparts.com/products/key-contacts-korg-rubber-keyboards

Ciao
Peter

http://www.ullrich.at.tt (my webpage)
http://www.rc100-usb.at.tt (Roland Sampler Tool)
http://synpro.heimat.eu/datadial.htm (DataDial Synth Addon)


Von: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] Im Auftrag von mark verbos
Gesendet: Montag, 19. Februar 2018 16:07
An: synth-diy at synth-diy.org
Betreff: Re: [sdiy] Keyboards good for scrap / repurposing?

Is there anywhere to buy just the rubber keypads that are inside of keyboards? With 2 switches for velocity? Kind of a variation on this thread, I’d like to experiment with making keys out of other materials.

Mark







On Feb 19, 2018, at 2:36 PM, Jean-Pierre Desrochers <jpdesroc at oricom.ca<mailto:jpdesroc at oricom.ca>> wrote:

If anybody is interested I have some very nice
44 and 61 notes keyboards for sale.
They have been ripped from Roland and Yamaha keyboards.
If I remember those I have are matrix type with diodes
with a flat cable header connector.
J-Pierre

Le 2018-02-19 06:26, sleepy_dog at gmx.de<mailto:sleepy_dog at gmx.de> a écrit :
Mikko Helin wrote:
You could make optical scanner for any keyboard like an acoustic piano.

https://hackaday.com/2010/10/07/playing-piano-with-optical

Ah! I have been thinking about optical scanning for a while, such a thing should worst case get dirty (dust?)  and need to be cleaned, but may last forever, eh?
And probably one could also implement (poly) aftertouch with this, two birds one stone.


And Roman:
Thanks for the warning about "plastic springs", that doesn't sound very long-lasting...

- Steve




19.2.2018 10.59 "Roman Sowa" <modular at go2.pl<mailto:modular at go2.pl>> kirjoitti:
That's exactly how keyboard scanning is done in old organ consoles you all are talking about now. Not in every one, but usually in Ahlborn, one of the major european organ makers. The HC138 decoder is already mounted on the PCB with rubber contacts.

I heard from many organ repairmen that rubber contacts fail first, especially in Fatar keyboards. They literally fall apart. Probably not an issue for casual mono synth player, but those kind of organs are heavy banged every day with 10 fingers.

Don't bother looking for old broken toy synths, they all have keys made so one octave is made of 2 pieces of plastic, one white with 8 keys and the other one black with 5 keys. And the piece of plastic that holds it together is also back support and return spring. This is also the case in entry level Yamaha digital pianos.

Roman

W dniu 2018-02-19 o 01:29, rsdio at audiobanshee.com<mailto:rsdio at audiobanshee.com> pisze:
Steve,

Since you are writing your own firmware, you might be interested in one simple way to reduce the number of GPIO pins needed. Since the Columns in a matrix of switches are only ever active one at a time, you can use a CMOS 3-to-8 decoder chip. That requires only 3 GPIO pins, but generates 8 Column strobes. The 4-to-16 variations of the chips come in both active high and active low variations (I seem to recall that the 3-to-8 do not). You can just hard-wire the Enable pin so that one Column is always active (unless that screws up some part of your circuit that is shared), and then your firmware can increment a binary variable that is directly written to the GPIO port as 3 or 4 bits, as appropriate.
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