Over voltage and Under voltage cut-off circuit with delay time

331

03:06:41

Using 555 ICs for Under & Over cut-off with delay time circuits (around 20 seconds). 

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To see how circuit work. Please adjust supply voltage high and low from 8 to 13 volt. 

If you are using 12v step-down transformer 

AC operation voltage range 160 - 240v

AC 160v to 240v  = DC 8.7v to 13v (on) 
2 green LEDs from middle row will light on

AC 160v = DC 8.7v (under cut-off) 
2 red LEDs from first and third row light on 

AC 240v  = DC 13v (over cut-off)
2 red LEDs from upper row will light on 

delay time
1 green LED and 1 yellow LED will light on

published 4 years ago

saminda_lk

4 years ago

This has a very long delay time

aungmoekhine

4 years ago

Delay time is around 20 seconds and you can adjust by change value of resistor and capacitor which connected to pin number 6 and 7 of 555 ic using for dealy function (left upper coner).

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