[sdiy] Fet to short pedal input?

[el macaco]

Thanks guys,

I believe the oedal just closes a circuit from what I remember from the schematics, (gated) might have a voltage.  I thought fet because it gates and connects the two I/I pins, and i didn’t know bjts would work the same way.

I have a bunch of 2N5458's around, but if a 3904 will do it that's much better!

I have optocouplers for midi jacks, but bjt or fet seems more direct.

I thought about relays but I didn't know enough to find a match, and I have a few fets around.

Thanks again!

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________________________________
From: Tom Wiltshire <tom at electricdruid.net>
Sent: Thursday, November 27, 2025 4:41:35 PM
To: el macaco <elmacaco at hotmail.com>; el macaco via Synth-diy <synth-diy at synth-diy.org>
Subject: Re: [sdiy] Fet to short pedal input?

Why FET? Can't a simple BJT like 2N3904 do this?

Does this portamento input have a graded response or is it a simple on/off affair?

Tom

On 27 Nov 2025, at 20:34, el macaco via Synth-diy <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>> wrote:

Hi all,

The portamento pedal input on arps has me thinking of using my midi to cv converter's velocity output (+5V) to activate a fet with the two pedal contacts on the source and drain.

Can it be this simple?  The only power coming from the velocity 5v?

Thanks,

Ed

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