Photocell controlled power supply circuit for an LED
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United States of America Patent
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-
May 18, 1982
Grant Date -
N/A
app pub date -
Mar 10, 1980
filing date -
Mar 12, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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