Pulse generating circuit

In a pulse generating circuit for generating a pulse output and applying said pulse output to a load by charging a capacitor from a D.C. power source through a charging resistor and discharging the charge of the capacitor through a switching element that is comprised of a thyristor, an improvement comprising:

• a first transistor connected to said capacitor and to said charging resistor such that said transistor is switched to a saturated conducting state by the charging current of said capacitor, said transistor non-conducting upon completion of charging of said capacitor;
• and
• trigger means for turning on said switching element when said transistor switches to the non-conducting state, and for preventing triggering of said switching element when said transistor is in the saturated state, such that said capacitor discharges through said switching element when said trigger means turns on said switching element.