Night switch (CB8280E)

Found in a 1964 Philips manual, this circuit uses only passive components. The relay is a high voltage sensitive type.

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Precision Half-Wave Rectifier LM741 (CB25222E)
This instrumentation circuit can be applied to equivalent operational amplifiers. We found it in...
Comparator Driving CMOS (CB15932E)
In the figure, we show how the integrated voltage comparators of the 139, 239 and 339 series can...
Wireless Photoelectric Sensor (CB12927E)
This circuit emits a signal in the AM range, whose modulation frequency depends on the intensity of the...