Browse Prior Art Database

2-WIRE ISOLATED REMOTE LEVEL CONTROL

IP.com Disclosure Number: IPCOM000026111D
Original Publication Date: 1990-Jun-30
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 65K

Publishing Venue

Xerox Disclosure Journal

Abstract

The circuit illustrated in the Figure fulfills a need for a remote level control of a system with isolation from the output. By using only 2 wires, preferably coaxial (e.g. RG196AAJ) for noise immunity, human input by a potentiometer 10 and indication of output by an LED 12 are achieved. The potentiometer 10 allows infinite level control from "off' to "on7,. An opto-isolator 14 provides a suitable resistance change, e.g. from about 7 KR to 700 KS2, for driving solid state switches, analog to digital converters, audio amplifiers, power amplifiers, motor controls, light controls, and the like, while isolating the operator from the controlled output. Various suitable sensors or inputs 16 and 18 can be added to the front end of this remote control for additional control. Examples of typical sensors include thermistors for temperature control or photoresistors for light control. Due to the gain of the transistor 20 (e.g. 2N49191, long distances of several hundred feet between the input and output are possible with high noise immunity.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

2-WIRE ISOLATED REMOTE Proposed Classification LEVEL CONTROL US. C1.323/364 Edward A. Domm Int. C1. H03h 1/00

SENSORS

TO TURN

16

1

+ 15VDC

,

20 18 TURN 41N ON

TO SENSORS

XEROX DISCLOSURE JOURNAL - Vol. 15, No. 3 May/June 1990 131

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Page 2 of 2

2-WIRE ISOLATED REMOTE LEVEL CONTROL(C0nt'd)

The circuit illustrated in the Figure fulfills a need for a remote level control of a system with isolation from the output. By using only 2 wires, preferably coaxial (e.g. RG196AAJ) for noise immunity, human input by a potentiometer 10 and indication of output by an LED 12 are achieved. The potentiometer 10 allows infinite level control from "off' to "on7,. An opto-isolator 14 provides a suitable resistance change, e.g. from about 7 KR to 700 KS2, for driving solid state switches, analog to digital converters, audio amplifiers, power amplifiers, motor controls, light controls, and the like, while isolating the operator from the controlled output. Various suitable sensors or inputs 16 and 18 can be added to the front end of this remote control for additional control. Examples of typical sensors include thermistors for temperature control or photoresistors for light control. Due to the gain of the transistor 20 (e.g. 2N49191, long distances of several hundred feet between the input and output are possible with high noise immunity.

~

132 XEROX DISCLOSURE JOURNAL - Vol. 15, No. 3 May/June 1990

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