Voltage regulator

327

05:49:57

Voltage regulator for 6.8 volt

published 3 years ago

Robert_Kidd

3 years ago

It will drop by about 0.7V when you apply a load.

eroleken

3 years ago

Then what is the role of transistor?

Robert_Kidd

3 years ago

Firstly, the voltmeter represents no load - it draws no current at all. In real life a voltmeter can have a very high impedance (resistance). In EC the voltmeter has infinite resistance since it’s model is a ‘perfect’ voltmeter.

Robert_Kidd

3 years ago

Without a load the transistor is doing very little since it’s emitter is floating (not connected to anything). When you apply a load the transistor will begin to conduct. When this occurs you have approx. 0.7V drop across the base emitter junction. It’s basically a PN diode junction.

Robert_Kidd

3 years ago

Note that in EC the base emitter drop is modelled at 0.8V rather than the more traditional text-book figure of 0.7V. This is a design decision taken by the app creators. If you apply a 1k load your 6.8V drops to 6.03V.

Robert_Kidd

3 years ago

If you want more details Google Series Pass Regulator.

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