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Question regarding negative VCC and diodes

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NicholasTok

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Hi everyone,

I would like to ask about some questions which I am not sure of, am I right that the voltage across the RL is -1.25Vdc with a supply voltage of -4.05Vdc with the diodes arranging in such a way?
 

According to me, simple KVL can give u the answer.
Since each diode has a forward bias drop of 0.7V, the voltage across resistor will simply be Vsource - 4 * 0.7
 

The picture is a bit misleading but you're right. Diodes are forward-biased so voltage drop is positive from left to right.
 

vsnute said:
The picture is a bit misleading but you're right. Diodes are forward-biased so voltage drop is positive from left to right.
Click to expand...

sorry for the poor illustration... think this one would be a better one... i intent to pump in a negative DC voltage... and hope to achieve a -1.25Vdc at the load...
 

it seems it will be biase around -1.25 and your KVL wolks good
 

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