This is the third and
last in a series of
three miniature
designs for beginners
in electronics. Each
of the designs is
powered by a 3 V
lithium manganese
dioxide nonrechargeable
battery
and is provided with
some sort of visual
indication. The
brooch presented in
this article is an elementary
flashing
circuit which has no
pretensions other
than that of an
optoelectronic toy.
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