Electric fence shocker circuit

Claim 1

In an electric fence shocker circuit including a capacitor, a transformer primary winding, and a silicon controlled rectifier, means connecting said capacitor, said transformer primary winding, and the anode-cathode circuit of said silicon controlled rectifier together in series, means for charging said capacitor, and trigger means coupled to the gate electrode of said silicon controlled rectifier for firing the same to discharge the charge on said capacitor through said transformer primary winding, the improvement comprising a second silicon controlled rectifier, means cOnnecting the anode-cathode circuit of both silicon controlled rectifiers together in series, and means coupling trigger pulses to the gate electrodes of both silicon controlled rectifiers, whereby if one of the silicon controlled rectifiers should suffer an interim mode failure, the other silicon controlled rectifier will hold said series circuit open until the gate electrode of said other silicon controlled rectifier is triggered by said trigger means, there being a capacitor connected in series with the gate electrode of one silicon controlled rectifier and a diode connected in series with the gate electrode of the other silicon controlled rectifier.