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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Regulator with Low Adjustment Resistance (CB1205E)
In the figure we have a regulator circuit for output voltages of 0.5 to 10 V with currents up to...
Sharp Cut Filter (CB6732E)
Found in American documentation from 1968, this circuit has an acute cut-off of the frequency to...
Automatic Crossing Light (CB14947E)
When a model train crosses a level crossing, interrupting the light on the sensor, this circuit...