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

Discussion in 'Electronics Homework Help' started by Orzechix, Dec 19, 2016.

1. Orzechix

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0
Dec 19, 2016
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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2. (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

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Jan 21, 2010
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?

3. Orzechix

2
0
Dec 19, 2016
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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4. (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

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Jan 21, 2010
Do you understand what a voltage divider does?