[sdiy] Negative resistance elements

Ben Stuyts ben at stuyts.nl
Sat Apr 3 14:21:56 CEST 2021

Interesting question. Reminds me of UJT's. There are still a few available according to digikey. I think UJT's were used on some old organs as top octave oscillators if I remember correctly.

Also: thyristors, triacs, etc, and neon bulbs (looking at my Philicorda organ :-) ).


> On 3 Apr 2021, at 03:24, cheater cheater via Synth-diy <synth-diy at synth-diy.org> wrote:
> Hi all, a recent conversation about tunnel diodes brought me to the
> question of something like this could be useful with synthesizer
> design. Putting aside the fact that they are currently very rare, are
> the unique characteristics of this kind of device useful?
> Specifically, they have a negative resistance segment in their I/V
> curve. The curve rises (positive resistance), then falls (negative
> resistance), then rises again.
> This article explains tunneling diodes pretty well:
> https://www.electronicshub.org/tunnel-diode-working-characteristics-applications/
> and here is the I/V curve:
> https://www.electronicshub.org/wp-content/uploads/2018/10/Tunnel-Diode-I-V-Characteristics.jpg
> I know for one thing tunnel diodes were used to make very fast
> oscillators, schmitt triggers, and flip-flops, but other than that,
> are there any other uses where they could be used?
> Thanks
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