Detection circuit for a light-sensitive element which is substan

Details Detection circuit for a light-sensitive element which is substan Detection circuit for a light-sensitive element which is substan

1989-04-07

1990-08-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

2502081, H01J 4014

Patent

active

049470329

ABSTRACT:
The invention relates to a circuit for a light-sensitive element (1), for example an infrared diode. The anode (a) of the light-sensitive element is coupled to a point of constant potential (earth). The cathode (c) of the light-sensitive element (1) is coupled to the collector of a pnp transistor (7) and, via a resistor (3), to the base of this transistor. The emitter of the transistor is coupled to a second point (6) of constant potential (+). The base is also coupled to this point (6) via a series arrangement of a resistor (5) and a capacitor (4). The desired sensitivity of the circuit is maintained even in the case of a high background light level.

REFERENCES:
patent: 3576452 (1971-04-01), Smith
patent: 4355237 (1982-10-01), Harris

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