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Power detection circuit

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Murugesh_89

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Hi,

I want to detect the power failure little earlier. So i designed the following circuit.
Power failure detection.jpg

Where do i need to connect the cathode of zener diode ZD2 ( To the point A or B in the image) so that i can get maximum time after power failure?

I just want to know which one has the more effect than the other...
 

Hi,

The 24V power supply will have internal capacitors, therefore there will be not much difference in connectiong A or B.

The fastest is to check power supply input.


Klaus
 
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