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Unijunction Transistors

Weird Component #45

Unijunction Transistors
Mention the word transistor and I bet most people immediately think of the usual bipolar variety. Unijunction transistors (UJTs) aren’t common anymore but a few decades ago they achieved widespread use in low frequency oscillators and silicon controlled rectifier (SCR) firing circuits. Let’s take a look at how these devices work—and at a modern replacement.
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