4-tube reflex (T1662E)

This circuit that uses a loop antenna was found in a 1924 publication. The circuit has several supply voltages and sets of audio and RF coils.

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MAX452 Video Driver (CB25115E)
This circuit is for analog TV video signals and was found in the March 1988 issue of Radio...
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To make a single LED flash in time with your amplifier's music, we have the circuit given below. The...
5V x 500 mA Buck Converter (CB9952E)
Found in documentation from the 1970s, this reducing regulator uses integrated circuits and...