Anticipating timer switches before the button

Posted on Jul 10, 2012

This Design Idea offers a solution to the challenge of turning devices on or off in the past. In Figure 1, IC2 is a 555-type timer (preferably CMOS) connected as a monostable one-shot multivibrator. The pushbutton switch, S1, triggers IC2. You can replace S1 with a transistor or an optocoupler, for example. You can connect VOUT to a relay or a transistor, if needed. You might need to adjust the values of R4 and R5, depending on the output load and the characteristics of S1.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Phase Shifter With Eight Outputs Circuit
    Light Follower Robot using Arduino
    Low Power FM Transmitter
    General-Purpose Alarm
    Simple Square Wave Generator with 7400
    LED Modulation Circuits
    Kodiak Military History Fire Control Telephones
    Crystal Sine Wave Oscillators
    Dynaco ST-70 Amplifier
    Common intermediate frequency amplifier circuit having a circuit and on the radio