H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/2
H02H 5/00 (2006.01) G01D 5/165 (2006.01)
Patent
CA 1324431
POTENTIOMETER POSITION SWITCH CIRCUIT ABSTRACT OF THE INVENTION A potentiometer position switch circuit which includes a meter mechanism having a low friction potentiometer coupled to move therewith. The output of the low friction potentiometer is coupled together with the output o f a set point potentiometer across the input terminals o f a comparator. A magnetic latching double pole, double throw relay having set and re-set relay coils is connected to the output of the comparator through the gate of a first voltage operated transistor and through sufficient resistance to minimize current drain and also through an invertor to the gate of a second voltage operated transistor and through a second resistor of sufficient resistance to minimize current drain. The output of the first voltage operated transistor is connected from a second voltage source through the set relay coil to ground and the output of the second voltage operated transistor is connected from a voltage source through said reset relay coil to ground. one set of contacts on the relay are connected to ground the gate on said second transistor when the voltage on the gate of the first transistor is high and to ground the gate on the first transistor when the gate on the second transistor goes high. The other set of contacts are connected to actuate a utilization circuit in one or the other position.
606459
Elderton Peter Platt
Granada Richard Paul
Howes Royal Ellsworth
Itt Corporation
Smart & Biggar
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