Constant-brightness-control

  
An automatic control maintains a lamp at a constant brightness over a wide range of supply voltages. This circuit utilizes the consistency of photodiode response to control the phase angle of power line voltage applied to the lamp and can vary the power between that available and `` 30% of available. This provides a candlepower range from 100% to less than 10% of nominal lamp output.
Constant-brightness-control - schematic

The 100-J.tH choke, resistor, and capacitors form an ric filter network that is used to eliminate conducted RFI.




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