The most noteworthy element in this circuit
is Th1, which is known in data books
by no fewer than three different names:
thyristor tetrode. programmable uni-junction
transistor (PUT) and silicon-controlled
switch. In fact, the BRY39 is a fourleyer
(p-n-p-n) component. One of the
characteristics of this type of component is
that the junction of the two outer layers,
that is, anode and cathode, begins to conduct
when the potential across it exceeds a
certain value.
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