Power saving relay driver

Relay coil after switch ON needs to voltage much lower than its nominal voltage, 
We can use this property of relay to saving 85% of the power to increase the battery life in battery powered circuits.
To reduce the current / power consumption we can put a resistor through the relay coil, but since this low current not enough to running the relay at the beginning so we should short out the resistor for 1 second, then the relay switch keep going.

Power saving relay driver

Power saving relay driver
 You have to use this formula to calculate the suitable resistor value:

Power saving relay driver


For more explanations please watch this video:



  

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