polarity / wiring on FV500H expression output

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Steviebone
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polarity / wiring on FV500H expression output

Post by Steviebone » Tue Aug 23, 2022 7:52 pm

Can someone verify the exact wiring on the EXPRESSION output of a FV500H expression pedal? The manual does not specifically say TRS, RTS or TS. I cannot make these units work at all with my stomp pedals where other expression pedals work fine. I assume a standard TRS cable should work but since the manual does not say it specifically I wanted to explore the possibility that maybe a reverse polarity wiring is needed to make these things work. Anyone else had issues using the FV500H as an expression pedal on modern high end stomps?

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laurie
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Re: polarity / wiring on FV500H expression output

Post by laurie » Tue Aug 23, 2022 8:45 pm

Swap T and R on one end of the cable and see if it fixes it.

Steviebone
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Re: polarity / wiring on FV500H expression output

Post by Steviebone » Tue Aug 23, 2022 9:52 pm

that was next on my chores list... just curious if anyone else had these issues?

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laurie
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Re: polarity / wiring on FV500H expression output

Post by laurie » Wed Aug 24, 2022 1:38 am

Steviebone wrote:
Tue Aug 23, 2022 9:52 pm
that was next on my chores list... just curious if anyone else had these issues?
Yes, but not with Boss/Roland gear. Was connecting expression pedals to a Fractal AX8. Had the same symptoms. 100% fixed with T and R swapped. YMMV with Roland gear.

Steviebone
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Re: polarity / wiring on FV500H expression output

Post by Steviebone » Thu Aug 25, 2022 2:52 am

yes... got around to making a cable tonight... swapped the tip and ring... wahla! Can't believe nobody makes those cables. Time for some cable making action...

Steviebone
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Re: polarity / wiring on FV500H expression output

Post by Steviebone » Thu Aug 25, 2022 1:50 pm

ring/tip swap worked. These pedals likely work well with BOSS pedals and pretty much nothing else.

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SamXTherapy
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Re: polarity / wiring on FV500H expression output

Post by SamXTherapy » Sat Sep 03, 2022 11:29 am

This could explain why an old Bespeco expression pedal I have won't work with the RV-6. Funny thing is, it works fine with the GT-5. Time to break out the soldering iron....mwahahahahaha!

Edit to add: This may not be the solution I wanted - but I'll try anyhow - since the pedal has a polarity switch that doesn't make the slightest difference on the RV-6 but works on the GT-5. Oh well, nothing to lose but time, fingers, patience, what's left of my hair...
Coppula eam se non posit acceptera jocularum

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SamXTherapy
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Re: polarity / wiring on FV500H expression output

Post by SamXTherapy » Sat Sep 03, 2022 2:15 pm

Well, well, welly well... it works perfectly! Happy, happy, joy, joy! As all the cool kids say. :D

Many thanks Steviebone for discovering this.
Coppula eam se non posit acceptera jocularum

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