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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Light alarm activating SCR (CB25481E)
This circuit was found in the July 1992 issue of Radio Electronics magazine. The circuit is based...
Parallel Port Interface (CB25730E)
The circuit illustrated in Figure allows external loads (8) to be driven from parallel port...
Electronic Thermometer (CB19604E)
The sensor of this circuit is a thermistor of the same value as the adjustment circuit formed by...