working of a series voltage regulator

[ABEL DANIEL]

can anyone explain,how the following voltage regulator circuit compensate for the voltage changes?
https://upload.wikimedia.org/wikipedia/commons/9/98/Series_reg.gif

 

[KerimF]

Sorry, on my side, I couldn't open the link.

 

[IanP]

can anyone explain,how the following voltage regulator circuit compensate for the voltage changes?
https://upload.wikimedia.org/wikipedia/commons/9/98/Series_reg.gif

It's done by keeping constant voltage at the Base of the transistor.
The output voltage is Vz-Vbe (Vbe=0.65)
:wink:
IanP

 

[Kral]

If the voltage on the emitter of Q (the load voltage) drops due to an increase in load current, the base - emitter voltage on Q tends to increase, since the base voltage is held constant by the zener. This causes more base current to flow, thus increasing the emitter (load) current, compensating for the tendency for the output voltage to drop.

 

[ABEL DANIEL]

thanks guys for your explanation.