On 01/09/2022 09:57, david wrote:
On 8/31/22 22:31, Will Godfrey wrote:
On Thu, 1 Sep 2022 09:33:11 +0200
Alexandre DENIS <contact@xxxxxxxxxxxxxxxxxx> wrote:
On Wed, 31 Aug 2022 18:06:59 -1000
"David W. Jones" <gnome@xxxxxxxxxxxxx> wrote:
Will a Yamaha expression pedal work on a non-Yamaha MIDI keyboard? It
uses a stereo 1/4" plug.
Thanks!
Hi,
Some expression pedals are wired with the pot on TRS, some others use
RTS (i.e. wiper of the pot either on tip or ring). To make things
worse,
some use a lienar pot, some others use a log pot.
AFAIK Yamaha uses RTS wiring. On the other hand, most pedals use TRS.
But in a lot of keyboards, the polarity is either tunable or
auto-detected.
The only advice is to test the pedal on the keyboard, or to check in
its documentation.
-a.
For this sort of thing, and testing leads, PSU polarity etc. a small
cheap
meter is invaluable. Takes all the guesswork out of it - so you see
what you
*actually* have, not what it says it has!
I have a meter. Will just have to figure out how to test this using it!
David,
crude ASCII sketch of typical TRS pedal:
S R T
| | |
| V |
WWWWWWWWWWW
A RTS pedal simply re-labels R and T.
Set the pedal mid-way, set meter to KOhms, measure resistance between
sleeve and ring, sleeve and tip.
You should find one if about half of the other (if a log pot it may be
way off half, but at least less
than.) The lower reading is the slider. Either way, the best way to test
is to simply try it.
Bill
--
+----------------------------------------+
| Bill Purvis |
| email: bill@xxxxxxxxx |
+----------------------------------------+
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