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
Click here to download the full size of the above Circuit.

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.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Guitar Tremolo Unit
    3 channel audio mixer (2N3904)
    learning How does this SIM card reader circuit work
    Metal Detector Circuit Schematic using Beat Frequency Oscillator (BFO)
    a more practical capacitor powered
    pic16f688 based digital voltmeter
    delay circuit for surround sound
    pic digital clock timer
    4 X 15 Watt power amplifier
    Dark detector circuit
    XTR112 114 thermocouple measuring circuit diagram of a loop