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Mains Pulser

Posted by merzaha gulhku Friday, April 12, 2013 0 comments
The pulser is intended to change the primarys voltage on and off at intervals between just below a 2d and as a lot as 10 minutes. This comes in handy, for instance, when a chiefs-operated gear is to be tested for lengthy periods, or for lengthic switching of equipment. Transformer Tr1, the bridge rectifier , and regulator IC1 present a stable 12V provide rail for IC2 and the relay. The timer is arranged so that the length-determining capacitor may additionally be charged and discharged independently. Four time ranges can additionally be chosen by means of deciding on capacitors with assistance from jumpers. Short-circuiting positions 1 and 2 offers the lengthyest time, and short-circuiting none the shortest.

Circuit diagram:
Mains Pulser Circuit Diagram

In the latter case, the 10µF capacitor at pins 2 and 6 of the timer IC determines the time with the relevant resistors. The value of this capacitor could also be chosen rather lower. The two preset potentiometers permit the on and off durations to be set. The 1k resistor in series with one of the crucial presets resolves the minimal discharge time. The timer IC switches a relay whose double-pole contacts swap the mains voltage. The LEDs point out whether the mains voltage is switched through (red) or no lengthyer (green). The 100mA slow fuse give safety tos the principles transformer and low-voltage circuit. The 4 A medium sluggish fuse give protection tos the relay once morest overload.

Source : extremecircuits.net