Expression pedal question

ronnie · March 06, 2009, 07:57:34 PM

Hello,

I built john hollis ultra flanger, great pedal, I was wanting to know if it would be possible to control the regeneration pot with an external expression pedal,

I've read RG keens page about this, but, I'm haveing a hard time with it, if this is possible, does anyone know how I could wire the regen pot to a jack.

Thanks in advance,

I'd greatly appreciate any info I can get.

Ronnie.

ianmgull · March 06, 2009, 10:19:39 PM

I'm not familiar with the circuit you mentioned but in general it's not that complicated.

Use a stereo jack (three conductors) and wire each of the three wires going to the pot to the stereo jack. plug a stereo cable (trs) into this jack and to your expression pedal. put another stereo jack on your expression pedal and connect it to the lugs on the pot of your expression pedal.

Just be mindful to connect the correct wires to the correct lugs on the pot.

ronnie · March 07, 2009, 07:27:41 AM

Thanks Ian,

I'll give it a try and see what happens.

ronnie · March 07, 2009, 03:57:14 PM

OK, I tried hooking it all up as described, Everything works perfectly,

now the only problem is that when I install this new jack in the pedal, (I drilled a new hole in the pedal for it) it grounds out the connection to the expression.

Any ideas why this might be happening.

I really appreciate te help.

ronnie · March 07, 2009, 09:44:09 PM

Does anyone know why this jack might be grounding out the expression pedal,

I just can't figure it out,

it's driveing crazy.

ianmgull · March 07, 2009, 11:21:15 PM

Sorry, I didn't think of that.

Whatever you have connected to the sleeve will make contact with the enclosure and ground. Can you post the Schem? If one of the three connections is ground, make that the sleeve. Otherwise you could use a plastic washer (or plastic jack for that matter) to make sure that your sleeve connection isn't grounding.

sevenisthenumber · March 08, 2009, 01:00:55 AM

Quote from: ianmgull on March 07, 2009, 11:21:15 PM
Sorry, I didn't think of that.

Whatever you have connected to the sleeve will make contact with the enclosure and ground. Can you post the Schem? If one of the three connections is ground, make that the sleeve. Otherwise you could use a plastic washer (or plastic jack for that matter) to make sure that your sleeve connection isn't grounding.

That's it.

ronnie · March 08, 2009, 08:40:26 AM

Quote from: sevenisthenumber on March 08, 2009, 01:00:55 AM
Quote from: ianmgull on March 07, 2009, 11:21:15 PM
Sorry, I didn't think of that.

Whatever you have connected to the sleeve will make contact with the enclosure and ground. Can you post the Schem? If one of the three connections is ground, make that the sleeve. Otherwise you could use a plastic washer (or plastic jack for that matter) to make sure that your sleeve connection isn't grounding.
Thankyou so much Ian, you've really helped me with this, I don't really know how to post images,

I'll just use a plastic jack.

Thanks man.

That's it.

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Expression pedal question