Some time ago Kooler
posted these circuitsas variants of the "Joule Thief"
Diagram Attached to Original PostUpon analysis of the circuit diagrams it appeared
that the two circuits shown at the right of the
graphic were incorrect as there is no current
path through the transistors which includes the
transformer primary winding.
Kooler, in response to a question, indicated that
he believed those drawings were indeed correct
even though they looked weird.
It seems that the negative terminal of the power
sources in those drawings is connected to the
wrong end of the primary winding. As shown,
the negative terminal of the sources are connected
to the end of the primary winding which is attached
to the transistor emitter. These connections result
in a non-functional circuits.
By moving the negative terminal of the source to
the opposite end of the primary winding (where
the feedback capacitor is connected) the transistor
current paths will then include the primary winding
and the circuits will function.
Has anyone else who's tried those circuits had
similar experiences?
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Author
Topic: Circuit sj1. Terse and Technical only. (Read 167618 times)
