[sdiy] Keyboard Control

[harrybissell]

Yes, you are right. By taking the output from the low side you will
also get low note priority (which I for one, insist on :^)

H^) harry

Thomas Holley wrote:

> Thanks Harry,
>  I have the keyboard controller arranged so that the current source is to
> one end (HI) of a resistor ladder and the other end (LO) referenced to
> ground. The keyboard is from an old broken ensonique with little spring
> contacts on each key. I have it so when the key is pressed the contact
> grounds that point in the resistor ladder. The reference voltage for the
> controller is taken from the top of the resistor ladder where the current
> source connects (copied from an old ARP patent). With this arrangement I
> think the current source should then go on the low (left) key side to give
> the highest voltage reference to the high (right) keys. Is this right or do
> I have it turned around?
>
> Thomas
> ----- Original Message -----
> From: "harrybissell" <harrybissell at prodigy.net>
> To: "Thomas Holley" <thomasholley at adelphia.net>
> Cc: <synth-diy at dropmix.xs4all.nl>
> Sent: Saturday, October 18, 2003 1:57 PM
> Subject: Re: [sdiy] Keyboard Control
>
> > Hi Thomas
> >
> > Higher pitches (to the right side of the keyboard) get higher
> > voltages...
> > so the current source should go on the highest note side...
> >
> > H^) harry
> >
> > Thomas Holley wrote:
> >
> > >     I have a rather fundamental question. In a keyboard controller
> > > resistor ladder, does the high voltage side go to high pitch key or
> > > the low pitch key. I have been tinkering with an old keyboard and
> > > soldered up a 100 ohm resistor between each key for a nice ladder when
> > > it finally dawned on me that I had not a clue which side to put the
> > > current source on and which one to ground. Thanks for your help Thomas
> >
> >