[time-nuts] Switching transistors, current sources, nonidealties and noise

Richard (Rick) Karlquist richard at karlquist.com
Sat Jul 2 13:59:47 EDT 2016

I vaguely remember seeing designs where a through hole
transistor like a 2N5179 had a ferrite bead slipped over
the base to keep it stable.  Although this works, it
degrades the performance of the transistor.  I prefer
to put a resistor in series with the collector instead
of the base.  Since the collector is current source,
it theoretically has little impact at high frequencies.
But it is still effect against microwave oscillations.

Rick N6RK

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