Photocell controlled power supply circuit for an LED

Details Photocell controlled power supply circuit for an LED Photocell controlled power supply circuit for an LED

1980-03-10

1982-05-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250209, H01J 4014

Patent

active

043307060

ABSTRACT:
A power supply for a light emitting diode (2) is governed by two photo diodes (6,7) each arranged to act upon the base of one of two transistors (3,4) in a darlington connection. One photo diode (6) is adapted to be influenced by low intensity light, whereas the other diode (7) is adapted to be influenced by light of higher intensity.

REFERENCES:
patent: 4117457 (1978-09-01), Latta
patent: 4121122 (1978-10-01), Pokrandt
patent: 4140914 (1979-02-01), Jones

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