voltage comes in though the thermal fuses,goes though a capacitor/resistor/diode voltage triple and charges the big capacitor to like 580 volts. The cd4011 counts the ripple in the charging current. when its gets up to the counts in one second, it fires the small SCR. The small SCR triggers one of the big SCRs. The big SCR then dumps the big capacitor voltage into the output transformer. the transformer puts the voltage spike out to the output terminal. The 2 other big SCRs are for lighting protection.
You can check for voltage on the big capacitor to check for good input circuit and capacitor. If the big SCR shorts, the thermal fuses with open.
Most of the old solid state fencers had a standard resistor/capacitor timer,diac and SCR output circuit.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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