Unijunction transistor--is interchanging of B! and B2 oK and why.

I am returning to the old days trying to use a unijunction transistor for a simple relaxation oscillator. B2 appears to be usually connected to the case.

Considering how a UJT is constructed, it should make little difference which polarities are used across B2-B2 except for what should be minor detail. Is that so? Is power dissipation or shielding affected by having B2 connected to the case?

Again, the UJT and JFET seem to be of similar construction except for possibly the heft of the main N channel. Can a JFET work like a UJT?

Bill

-- Fermez le Bush

Reply to
Salmon Egg
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I can't remember enough about UJTs to be able to tell you about the first.

But no, UJTs and JFETs are not the same thing. Just because the schematic symbol is similar looking does nto make them the same.

On the other hand, you can "synthesize" a UJT with a pair of transistors connected properly. It was in the magazines in the old days, and I'm sure there's information somewhere on the internet about doing this.

Michael

Reply to
Michael Black

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