Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1979-05-21
1980-12-23
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361191, 361192, 361197, H01H 4732
Patent
active
042413761
ABSTRACT:
A system for automatically selecting operations in a random sequential manner having at least three electrical channel circuits, each channel circuit including primarily a trigger circuit, a switch circuit and an output circuit. Each trigger circuit includes an electrical conductor component exhibiting a negative resistance characteristic, such as a DIAC, adapted to turn on at a relatively high voltage and turn off at a lower voltage, each trigger circuit including a timer circuit for turning on and off the respective electrical conductor components, but all of the timer circuits having different time constants. The different switch circuits are adapted to be turned on by the signals from the corresponding trigger circuits and are adapted to be turned off by corresponding switch timer circuits, also preferably having time constants with different values.
Resultant output signals produced one at a time and in random sequence are adapted to control various operations, such as the scanning of a plurality of closed circuit television cameras, such as used in surveillance systems.
Lackey Harrington A.
Moose Jr. Harry E.
PhotoScan South, Inc.
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