555 Low power Consumption Timer Circuit


Posted on Feb 7, 2014

Normally 555 timer circuit even though the start push-button PB1 is not pressed, the timer keeps consuming power From the battery due to a potential divider formed by three 5k © resistors within the IC. this power consumption known as the idling power consumption of the timer is about 3mA. This, if left connected to a battery for a long time can


555 Low power Consumption Timer Circuit
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drain off the battery and may give unreliable operation. To deviate this short coming, you may use the circuit given in the below. Which enables power to be drained from the battery only when timing action is ON. For the idling period, the power consumption is zero. The circuit uses a double pole relay. One pole is used to energize the load, the other pole is used to cut off the supply line when the timing action is over. A push on the Start` switch energizes the relay RL1. A pair of contacts of the relay provides the supply voltage to the timer which get triggered. Oscillations start and when the output at pin 3 becomes HIGH, the diode D1 permits current to flow through the relay, thus latching  it up. The frequency of the oscillations depends on the time constant given by T=1. 1G—C1G—(R1 R3). After this time is over, the output at pin 3 goes LOW; the relay is released, and the load is de-energized. We aim to transmit more information by carrying articles. Please send us an E-mail to wanghuali@hqew. net within 15 days if we are involved in the problems of article content, copyright or other problems. We will delete it soon.




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