Timing circuit

Details Timing circuit Timing circuit

1974-10-29

1976-03-09

Envall, Jr., R. N.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307132E, H03H 900

Patent

active

039434150

ABSTRACT:
A timing circuit is disclosed which utilizes a principal transistor as a switch to control current flow through a load. The emitter and collector of this principal transistor are connected in a series with a load across DC terminals. Two control transistors are used to regulate when a current is passed by the principal transistor. The base of a first of these control transistors is connected between a resistor and a capacitor in an RC circuit which is connected so as to determine if a current is flowing in the first mentioned series circuit. The base of the other of the transistors is connected to the first mentioned series circuit through a resistor and a capacitor and is grounded through a resistor. As a result of charging of its associated capacitor and of feedback through this capacitor the first control transistor serves to render the principal transistor conductive after it has not conducted a current for a time interval determined by its associated resistor. The second control transistor serves to maintain the principal transistor conductive as its associated capacitor becomes charged and as the charge bleeds off of it.

REFERENCES:
patent: 3188623 (1965-06-01), Culbertson

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