Relay on/off Time Adjuster Circuit
This circuit is built around the popular timer IC 555. This circuit is designed to adjust both the on off times of the relay.
Here, the IC 555 has been used as an astable multivibrator. Diode D1 and D2 and two preset controls VR1 and VR2 have been used to get separate On and Off timings for the relay. By using this controls VR1 and VR2 the On and off timings of the relay can be adjusted independently.
Time period of the On and Off time to relay can be adjusted from 1 second to about 90 seconds by using the given values of VR1, VR2 and the capacitor C1. Take care to use a new IC for this circuit because a used IC may not perfom perfectly. Similarly, the Capacitor C1 should also be from a good and reputed manufacturer such as Keltron, Uptron or Phillips.
This circuit is built around the popular timer IC 555. This circuit is designed to adjust both the on off times of the relay.
Here, the IC 555 has been used as an astable multivibrator. Diode D1 and D2 and two preset controls VR1 and VR2 have been used to get separate On and Off timings for the relay. By using this controls VR1 and VR2 the On and off timings of the relay can be adjusted independently.
Time period of the On and Off time to relay can be adjusted from 1 second to about 90 seconds by using the given values of VR1, VR2 and the capacitor C1. Take care to use a new IC for this circuit because a used IC may not perfom perfectly. Similarly, the Capacitor C1 should also be from a good and reputed manufacturer such as Keltron, Uptron or Phillips.
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