Buffer with MOSFET (CB26318E)

This boost amplifier was found in a Popular Electroniics from the 90s. The circuit operates up to 20 MHz depending on the coils used.

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Touch switch (CB21299E)
Found in American documentation, this switch is based on the 4093. The load will determine the...
Low frequency multiplier (CB8239E)
This circuit was found in a 90s Electronic Design. The integrated circuits are from that time....
5 ms delay (CB1475E )
The circuit shown was obtained from a 1976s publication for radio amateurs. Its purpose is to...