- on Miscellaneous Electronics
- Published in issue 5/2014 on page 72
Weird Component #45
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.