Touch Switch (CB6449E)

This resistive sensor was found in a 1969 US documentation. The circuit uses transistors of the time, but current equivalents can be employed.

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3.5 MHz Loop Antenna (CB4758E)
This loop antenna was found in a 1990s documentation. The circuit includes a field strength meter. The...
Precision High Voltage Regulator (CB5878E)
This circuit is from the LM317's own manual obtained from an old documentation. The IC should be...
Triac load control (CB4178E)
In the figure we have the conventional configuration to use a triac to control a power load from...