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Detecting Voltage Drop
Detecting Voltage Drop
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Old 8th April 2013, 03:37 AM   #11
DUG is offline DUG  Canada
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Or this

A little less sensitive but fewer parts
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Old 8th April 2013, 04:30 AM   #12
KMossman is offline KMossman  China
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many thanks to all

I get the stupid b*gger of the day award

It does work, as I 1st outlined.................some days, one should NOT do electronics!


The LED limits the voltage across T1 BE, and blocks reverse voltage flow when the voltage drops, keeping the V across the cap.

So when V+ drops, T1 turns on and hence T2 turns on - driving the load. C2 stretches the 'pulse'.

accelator_circuit.png
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Old 18th April 2013, 04:48 AM   #13
gmphadte is offline gmphadte  India
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'The LED limits the voltage across T1 BE,...'

I feel the other way, I may be wrong.

Gajanan Phadte
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Old 18th April 2013, 08:20 AM   #14
KMossman is offline KMossman  China
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Quote:
Originally Posted by gmphadte View Post
'The LED limits the voltage across T1 BE,...'

I feel the other way, I may be wrong.

Gajanan Phadte
It does, and for this application it is a good thing. T1 already amplifies the Vd, so anything over [say] 2V is not necessary.
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Old 18th April 2013, 10:52 AM   #15
Elvee is offline Elvee  Belgium
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Here are a number of variants to choose from: - or + referenced, open collector, referenced to another supply, etc:
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