Timer circuit with multiple time delay outputs

Details Timer circuit with multiple time delay outputs Timer circuit with multiple time delay outputs

1978-08-25

1980-07-29

Dixon, Harold A.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250265, 250274, H03K 513

Patent

active

042152720

ABSTRACT:
A timer circuit is powered by an alternating current (AC) from an AC source which current is rectified to produce direct current (DC) and used to energize a power transistor connected between the DC source and in a load. A separate timing control circuit responds to a selected one of a plurality of AC input signals to provide multiple time delay control signals for initially actuating the power transistor to provide a current flow to the load and, subsequently for turning off the power transistor. The timing circuit uses a controlled charging of a timing capacitor to trigger a unijunction transistor into conduction. The unijunction transistor, in turn, develops an output voltage for actuating an SCR. The SCR is connected with its current conducting path across the load, e.g., across a relay coil, and is used to short-circuit the relay coil when the SCR is actuated into conduction. The selected input AC signal initiates the conducting state of the power transistor and terminates the conducting state of the power transistor by removing an actuating signal for the power transistor which also allows the SCR to turn-off to return the load circuit to its normal, or initial, state.

REFERENCES:
patent: 3131318 (1964-04-01), Snyder
patent: 3162772 (1964-12-01), Smith
patent: 3657564 (1972-04-01), Hollis

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