Optical sensor system for a bill validator

Details Optical sensor system for a bill validator Optical sensor system for a bill validator

1997-10-01

1999-01-05

Bartuska, F. J.

Check-actuated control mechanisms

Control mechanism actuated by check, other than coin , which...

By pliant currency

330254, G06K 700, H03F 368

Patent

active

058552685

ABSTRACT:
An optical sensor system for use in a currency validator is described. The system includes a controller, a plurality of light transmitters, a plurality of light receivers and a variable gain amplifier circuit connected to the receivers and to the microcontroller. The microcontroller controls the gain of the variable gain amplifier circuit. The variable gain amplifier circuit includes dual transconductance amplifiers connected together in such a manner to compensate for leakage current over a wide range of temperatures.

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