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The current Korg synths still use BJTs for this as seen in the Prologue 8 service manual (which I just discovered!)</div>
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<a href="https://www.manualslib.com/manual/2518830/Korg-Prologue-8.html?page=37">Https://www.manualslib.com/manual/2518830/Korg-Prologue-8.html?page=37</a></div>
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<b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Mattias Rickardsson <mr@analogue.org><br>
<b>Sent:</b> Friday, 28 November 2025 10:20 PM<br>
<b>To:</b> brianw <brianw@audiobanshee.com><br>
<b>Cc:</b> synth-diy@synth-diy.org <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] Fet to short pedal input?</div>
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<div style="direction: ltr;">On Fri, 28 Nov 2025 at 22:12, brianw <<a class="OWAAutoLink" id="OWAff9a2d00-e033-e161-ee47-e9af1be08727" href="mailto:brianw@audiobanshee.com">brianw@audiobanshee.com</a>> wrote:</div>
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<div style="direction: ltr;">On Nov 28, 2025, at 2:09 AM, Roman Sowa <<a class="OWAAutoLink" id="OWA9d2aa6bc-e00d-4baa-6c40-688ef1d6f464" href="mailto:modular@go2.pl">modular@go2.pl</a>> wrote:<br>
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> BTW, BJTs are most commonly used everywhere for muting output jacks during powerup or whatever other reasons, because it works so much better than FET in this application<br>
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I've only ever seen FET used for muting. In particular, I've seen depletion mode N-FET used because they conduct (to ground, in a mute circuit) when no voltage is applied to the gate. How would a BJT remain in saturation mode when all power is lost to the device?</div>
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<div style="direction: ltr;">I'd call this usecase "muting" (with big wavy rabbit ears around it) where the output clicks just need to become less loud, not necessarily silent. Here I've seen and used BJTs.</div>
<div style="direction: ltr;">For real muting, where the signal needs to be muted for real, I've seen and used FETs and CMOS switches/muxes. :-)</div>
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<div style="direction: ltr;">/mr </div>
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