Dividing timer

Details Dividing timer Dividing timer

1976-10-27

1978-10-10

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

307293, 361203, H01H 4718

Patent

active

041200144

ABSTRACT:
This disclosure relates to a timer for subdividing a finite time interval into a number of periods. An operational amplifier is connected as an integrator with a capacitor in its feedback path. An adjustable resistance network, enabling the selection of a fixed ohmic magnitude, is connected to the input of the operational amplifier and to a source of d.c. potential. A detector, connected to the output of the operational amplifier, determines when the capacitor has reached a fixed potential, by actuating a relay, the relay having normally open contacts in shunt with the capacitor, the closure of the contacts discharging the capacitor -- the charge-discharge cycle is then repeated. By selection of the ohmic magnitude for the resistance network, the operator can divide the time interval into equal periods in accordance with the number of times that the capacitor reaches the detected potential level.

REFERENCES:
patent: 3783392 (1974-01-01), Drake et al.
"Two Op Amps Simplify Design of Oscillator", Electronics, 4/1970, p. 92.
"Period of Sawtooth Ramp Extends to 5 Hours", Electronics, 6/66.

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