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DIY Hobby projects, diagram, schematic

555 Low power Consumption Timer Circuit

electronicecircuits, July 15, 2010August 16, 2023
555 Low power Consumption Timer

555 Low power Consumption Timer Circuit

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 5kΩ  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 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.

555 Low power Consumption or Reduce Power Timer Circuit

PARTS LIST
R110kΩ
R21kΩ
R3100kΩ Preset
C1100µF 16V
C20.01µF
D11N4001
D21N4001
RL112V Double Pole Relay
PB1Push to ON Push-Button Switch
IC1NE555

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=1.1×C1×(R1+R3). After this time is over, the output at pin 3 goes LOW; the relay is released, and the load is de-energized.

Thus, so long as the start switch is not pressed, no supply voltage is provided to the IC and so, its “idling” power consumption is zero.

555 reduce power Consumption Timer555 Low power Consumption Timer

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Comments (4)

  1. Pingback: Lotto Black Book
  2. abdo alshazly says:
    June 9, 2013 at 12:34 pm

    could i know what is the power dissipation for IC 555 timer ? .thank you .

    Reply
  3. Saverio Paleni says:
    June 18, 2013 at 2:04 pm

    Since I am planning to use the 555 Low Power Consumption Timer with a PC, I would like to know if it would work with 5V DC instead of 12V DC. I have found a 5V DC relay, will the other components need to be replaced?
    Thanks in advance

    Reply
  4. abdul says:
    October 14, 2014 at 7:31 pm

    Hi i would first like to thank you for the tiny cad.
    i need to build a timer circuit as a project but does not seem to work.i am struggling with the ic and the caps to use mainly the values.
    Please help

    Regards
    Abdul

    Reply

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