Mains Pulser Circuit


Posted on Feb 6, 2014

The pulser is intended to switch the mains voltage on and off at intervals between just under a second and up to 10 minutes. This is useful, for instance, when a mains-operated equipment is to be tested for long periods, or for periodic switching of machinery. Transformer Tr1, the bridge rectifier, and regulator IC1 provide a stable 12V supply ra


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

il for IC2 and the relay. The timer is arranged so that the period-determining capacitor can be charged and discharged independently. Four time ranges can be selected by selecting capacitors with the aid of jumpers. Short-circuiting positions 1 and 2 gives the longest time, and short-circuiting none the shortest. In the latter case, the 10 µF capacitor at pins 2 and 6 of the timer IC determines the time with the relevant resistors. The value of this capacitor may be chosen slightly lower. The two preset potentiometers enable the on and off periods to be set. The 1k resistor in series with one of the presets determines the minimum discharge time. The timer IC switches a relay whose double-pole contacts switch the mains voltage. The LEDs indicate whether the mains voltage is switched through (red) or not (green). The 100mA slow fuse protects the mains transformer and low-voltage circuit. The 4 A medium slow fuse protects the relay against overload.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    VHF 5/8wave vertical antennas
    Magnetic proximity sensor / detector
    Automobile-voltage-regulator
    Monostable-multivibrator
    Light circuit diagram: Audio Graphic Equalizer Circuit Using Op Amp
    direct coupled discrete astable
    VHF field strength meter
    USB Powered Mobile Phone Battery Charger
    The converter IC circuit diagram
    a simple Astable Multivibrator with the help of a circuit diagram
    Frequency counter hardware keys schematic
    A Simple Radio Receiver
    Peripheral circuits MIC5158 a simple 5V input 3.3V 10A output linear regulator circuit



    Top