[sdiy] J-Wire keyboards

[Ian Smith]

Thanks Tom.
 
I have apicture of the Pro-One keyboard underside up now and your explanation makes it make perfect sense now. I'm fairly certain I can convert this bubble keyboard to the J-Wire style with few problems.
 
-Ian

----------------------------------------
> CC: synth-diy at dropmix.xs4all.nl
> From: tom at electricdruid.net
> Subject: Re: [sdiy] J-Wire keyboards
> Date: Thu, 28 Jan 2010 15:53:14 +0000
> To: taciturn_unquiet at hotmail.com
>
> I don't know about J-wire keyboards in general, but I can tell you
> about the one in my Pro-One.
>
> The Pro-One does use a scanning matrix.
>
> The keyboard keys have a plastic 'spade' underneath them with little
> holes in. The J-wires are short lengths of wire (presumably some
> metal that doesn't tarnish if they had any sense) about 2" long that
> go through the little holes in the spades and stick out a bit beyond
> them. When you press the key down, this wire contacts a buss bar
> underneath. Since the Pro-one uses a scanning matrix, the buss bar is
> broken into short lengths connected with rubber sleeving, rather than
> being one continuous piece. It *looks* like a single buss, but it isn't.
> It's a very mechanically simple system, and consequently one of the
> most reliable keyboards I've got. The only problems are that the J-
> wires can get bent, but this can only happen when you've got it
> apart, so be careful when servicing, and that sometimes the buss bar
> or wires need cleaning. I use tape head cleaning solution for this
> which seems to work fine.
>
> HTH,
> Tom
>
> On 28 Jan 2010, at 14:37, Ian Smith wrote:
>
>>
>> Hey all,
>>
>> This came up in my previous thread. What is a J-wire keyboard? How
>> does it work? From what little information I can find, it looks
>> like a single buss keyboard not a scanning matrix. Does it work
>> with reed switches like Ray Wilson's single buss keyboard or is it
>> something else entirely?
>>
>> -Ian (have a keyboard but no guts for it) Smith
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