All About Circuits

Help please.

B

bountyhunter

Joined Sep 7, 2009
2,512
paulktreg said:
I'd like to monitor the "health" of a -5VDC supply using a circuit powered from +12VDC. Any ideas?
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Use s resistive divider from 12V to -5V so that there is a monitor point set to 2.5V. Feed it into a comparator whose other input is tied to a 2.5V reference and the comparator output will toggle if the -5V rail goes out of spec.
 
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