# [BASIC] How to interpret this circuit (including diodes), need detail explanation

#### Orzechix

Dec 19, 2016
2
This thing is clamp circuit from this website: http://www3.nd.edu/~lemmon/courses/ee224/web-manual/web-manual/lab5/node9.html. I dont understand how it works or maybe in half way. Could someone provide detailed solution (in horse sense )? Let's say for Vin = 3 VDC and another scenario Vin = 10 VDC. Without any further details, i mean value of resistors and diode forward voltage (i guess 0.7 but still). The thing is how to tell the polarization of those diodes?
I know that if this is diode: A ---->|---- K so it should be polarised in such way: + A ----->|----- K - to allow current flow through it with 0.7 V drop.

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#### (*steve*)

##### ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,509
Assume the diodes are perfect.

Remove D1 from the circuit and write a formula to describe Vout in terms of Vin for a positive Vin.

Next consider the effect of a perfect D1.

Lastly, what happens for a negative Vin?

#### Orzechix

Dec 19, 2016
2
Sorry for posting in wrong section. I still dont get the way to deal with such circuit. I dont know where to start, you said to remove D1 but why actually this one. I draw some schematics as you typed. But im unfortunately still confused :/.

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#### (*steve*)

##### ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,509
Do you understand what a voltage divider does?

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