Precise Voltage Source using Op-Amp

110

01:14:20

In this circuit, the output voltage is maintained constant by providing constant zener current.

Suppose that the output voltage tries to change, i.e. there is change in the voltage drop across R3 appropriately. Since Voltage across R3 is at the inverting terminal, the output is in the negative direction. Hence, any change in the output voltage is multiplied by the corresponding change at the inverting terminal. Thus the output voltage remains constant.

* The constant output voltage can be obtained by selecting suitable values of R2 and R3. 

published 8 years ago

zorgo

8 years ago

Just shake the device to give it a noise for it's input.

hurz

8 years ago

The point is, the opamp with "r2 and 3" equal is having a gain of 2. Which results in 2x4.5=9V doen't matter what the absolut values are of "r2 and r3"

hurz

8 years ago

And the shake is needed to bring it anway from zero volt which is also a solution which the OpAmp finds first!

hurz

8 years ago

Sorry, I have probable not point it out, this is a working bandgap reference voltage circuit, keep it up!

zorgo

8 years ago

Thanks!

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