[sdiy] Hacking the expression pedal input on a JD-800

[CCartCat at aol.com]

Very quick and dirty:   use a passive volume pedal and an insert cable (1/4" 
TRS on one end goes to the exp. pedal input; two 1/4" mono on the other end go 
to the in and out of the vol. pedal).


In a message dated 2/19/04 2:55:14 PM, philgallo at attglobal.net writes:


> David,
> 
> Here's a ref for a EV-5 schem.
> 
> http://www.geocities.com/phillipmgallo/ev-5-schematics.gif
> 
> regards,
> p
> 
> 
> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl
> [mailto:owner-synth-diy at dropmix.xs4all.nl] On Behalf Of WeAreAs1 at aol.com
> Sent: Thursday, February 19, 2004 11:10 AM
> To: david.k.cornutt at boeing.com; synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Hacking the expression pedal input on a JD-800
> 
> 
> 
> In a message dated 2/19/04 10:58:27 AM, david.k.cornutt at boeing.com
> writes:
> 
> << So the question is: has anyone opened up a Roland
> 
> expression pedal?  Does it consist of just a pot, or is
> 
> there active circuitry in it? >>
> 
> Hello David,
> 
> The Roland EV-5 pedal is simply a pot that's wired directly to the three
> 
> terminals of the 1/4" TRS plug (there's second pot that's also in there
> to set the
> "minimum value", but it can be eliminated for your purpose).  I don't
> have
> the schematic handy, but a 50K pot value seems to come to mind.  I'm
> pretty sure
> the pot has custom taper that's designed to match the throw of the pedal
> (the
> EV-5 still has a terrible feel, though).  I'll look around and see if I
> can
> find the schematic.
> 
> Michael Bacich
> 
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20040219/0149536e/attachment.htm>