Yes, a saturated transistor behaves similar to a short-circuit, but in
order to do so it must still be properly biased.
The basic rule is: a bipolar transistor will conduct collector current when
the base-emitter junction is forward-biased.
For an NPN transistor, the base & collector both need to be positive with
respect to the emitter
For PNP, base & collector need to be negative wrt emitter.
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MOSFETs are "similar" to bipolar transistor, though trickier because they
generally have reverse-diodes between source ("emitter") and drain
("collector"). For *most* applications, the reverse-diode is a godsend and
has no undesireable effects. They dont require any static drive current
(the gate is synonymous with the base of a bipolar), but they do require
several volts to turn-on rather than ~0.7V for a bipolar device.
I've used bipolar and MOSFET drivers for nixies; which one to use depends
upon the application.
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