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How to test and ensure whether that a phototransistor is in good or poor condition ?

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xiaobai00

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i need help of testing the phototransistor. I do not know how to test and ensure whether its able to work. Please help.
 
xiaobai00 said:
i need help of testing the phototransistor. I do not know how to test and ensure whether its able to work. Please help.
Click to expand...

Hi,
Test using the circuit shown.

Use a hand lamp to shine onto the photo transistor, the brighter the lamp
the lower V1 voltage will be.

This is a very rough test, but you should see a change in V1 between light and dark.

Lets know what you get.
 
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