Weirdness

106

01:21:10

Huh...as V_be rises to about 3.5V, the current from the base to emitter rises sharply and the collector current actually drops slightly

published 1 year ago

billoute720

1 year ago

When Vbe reaches 3.4V, Vcb=5 - 3.4=1.6V. So let's use a greater supply voltage. 10V for instance and the transistor will work in a linear mode.

MattFerrie

1 year ago

Oh that makes sense, so it's not the voltage between the base and emitter that matters but the voltage between collector and base?

billoute720

1 year ago

The transistor works differently depending on the needs of the user. It is complicated to teach a course here. It would be easier to ask for advice for a specific role.

MattFerrie

1 year ago

So the phrase that a transistor is an electrically controlled switch is just a simplification? That is, it's more complicated than a switch that turns completely on when there is a signal and turns completely off when there is no signal?

MattFerrie

1 year ago

Interesting, when I set the voltage at the collector to 1 volt and have the base voltage sweep from 0 to 2 volts, the base current shoots up extremely quickly at about 1.2 volts.

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