[sdiy] Keyboards good for scrap / repurposing?

Roman Sowa modular at go2.pl
Mon Feb 19 17:25:40 CET 2018


https://www.midi-store.com/fatar-kurzweil-keyboard-parts-s/2070.htm

Roman

W dniu 2018-02-19 o 16:06, mark verbos pisze:
> 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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>>>>
>>>>
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>>
>> -- 
>> « L'indépendance, c'est comme un pont :
>> avant, personne n'en veut, après, tout le monde le prend. »
>> Félix Leclerc
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