Automatic headlight shutdown (CB7260E)

This circuit for automotive use was found in American documentation from the 90s. The circuit uses common components today. The relay is 12 V.

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5 MHz oscillator with 250 kHz variation (CB13852E)
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Impedance Matcher (CB15540E)
Many oscilloscopes have high impedance inputs that make it difficult to observe high frequency signals...
Optical Communicator – Receiver (CB25536E)
This is the receiver for the previous circuit we found in the December 1992 Radio Electronics...