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<div>There are several ebow "clones" out there. I know I've seen a few on Indiegogo and Kickstarter, but this is the only one I could find with a quick search:</div>
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<div><a href="https://www.kickstarter.com/projects/38513516/wond-the-string-exciter-sustain-and-control-in-you">https://www.kickstarter.com/projects/38513516/wond-the-string-exciter-sustain-and-control-in-you</a></div>
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<div>So maybe string exciter is the term you need. Also worth a listen is the famous Gizmo (the Gizmotron). It's being reissued.</div>
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<div><a href="https://www.guitarplayer.com/gear/it-promises-to-revolutionize-the-world-of-music-watch-this-rare-vintage-news-report-on-the-gizmotron">https://www.guitarplayer.com/gear/it-promises-to-revolutionize-the-world-of-music-watch-this-rare-vintage-news-report-on-the-gizmotron</a></div>
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<div>GB</div>
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<div>------ Original Message ------</div>
<div>From: "Spiros Makris via Synth-diy" <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>></div>
<div>To: "synth-diy mailing list" <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>></div>
<div>Sent: 9/7/2022 10:54:50 AM</div>
<div>Subject: [sdiy] Magnetic String Actuation</div>
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<div dir="ltr">Hello, list,
<div>I am interested in experimenting with magnetic string actuation. That is, use an electromagnet to induce vibration to metallic(?) strings; the opposite of what a guitar pickup does typically. I have seen this concept realised in a couple of different applications:</div>
<div>1. <a href="http://instrumentslab.org/research/mrp.html">Magnetic Resonator Piano</a> is an electronically augmented piano that can do cool stuff such as real crescendos, electromagnetically dump strings, produce overtones etc. Every sound produced comes
from the strings themselves.</div>
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<div>2. <a href="https://www.thomann.de/gr/ebow_ebow.htm">Ebow</a> is an electromagnetic actuator for the electric guitar. Place it close to the strings and they will start vibrating, similar to the way they do when using a bow.</div>
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<div>3. <a href="https://www.soundonsound.com/reviews/moog-guitar">Moog Guitar</a> contains some sort of actuator and suitable circuitry to make it infinitely sustain notes, apply active damping and more.</div>
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<div>I bet there are more if we start digging, but these are some examples I can think of off the top of my head. Unfortunately, I don't have enough to go on here and decide on what kind of hardware I need to produce this effect. The magnetic resonator piano
researchers have published a couple of papers that go over the fundamental equations involved. Still, unless you can really wrap your head around them (I can't) it's not enough to get you going.</div>
<div>I obviously need some electromagnet, either off the shelf or custom wound. Then I need an amplifier that can drive enough power into it, in the correct frequency range. </div>
<div>Aliexpress is full of various electromagnets. How could I decide on a couple that might be promising and give them a try? </div>
<div>What about output amplifiers? I know the basics of driving speaker coils, but my guess is a strongly inductive load like an electromagnet is going to be a different story.</div>
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<div>I've been thinking about this for the past 10 years and still didn't manage to figure it out. Any kind of info or advice you could share is invaluable!</div>
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