Unijunction transistor
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A unijunction transistor is a three-lead electronic semiconductor device with only one junction. It acts exclusively as an electrically controlled switch.
Unijunction transistors
UJT die: the larger contact in the centre of the crystal is the emitter, the smaller one is B1; B2 is at the bottom of the crystal
Thyristor
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A thyristor is a solid-state semiconductor device which can be thought of as a highly robust and switchable diode, allowing the passage of current in one direction but not the other, often under contr
Unijunction transistor
…transistor, or PUT, is a multi-junction device that, with two external resistors, displays similar characteristics to the UJT. It is a close cousin to the thyristor and like the thyristor consists of four p-n layers. It has an anode and a cathode connected to the first and the last layer respectively, and a gate…
Thyristor
A bank of six 2000-amp thyristors (white disks arranged in a row at top, and seen edge-on)
Valve hall containing thyristor valve stacks used for long-distance transmission of power from Manitoba Hydro dams