LED beacon (CB21017E)

This circuit was taken from a popular 90's Electronics. The LDR is mounted next to the LED to feed back the circuit.

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DC to DC SMPS (CB9669E)
This circuit was found in an American documentation from the 80's. The components are from that...
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The circuit shown is from the Texas Instruments optoelectronics manual. It is intended for audio...
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This circuit drive an LED with constant current determined by the values of the resistors of 10...