Electric Fence Circuits
Electric Fence Charger - A rectifier diode is provided for the control circuitry in case the battery is connected backwards and also helps block some of the back EMF (electromotive force). An astable 555 oscillator circuit (for a more detailed description, see the notes section of the 3-6V Strobe Light) drives the base of a high voltage, high current transistor through a 100R resistor. This lets through enough current to cause the transistor to saturate for an on/off switching action. The timing when the highest power is desired interval at the collector is roughly 1s off and .02s on and can be varied by adjusting the trimmers. The collector is tied to the end of a primary coil of the transformer T1 through a diode.
Electric Fence Charger - Any good power transistor can be used in this circuit. The base resistor should be adjusted to obtain a pulse rate of about 50 pulses per minute. The range of values shown can go from 10 pulses to 100 pulses per minute. The single fence wire must be insulated at each supporting pole and should be mounted low enough to prevent an animal from crawling under the wire. The two neon lamps indicate when the unit is operating.
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