Pulse motor control (CB20554E)

This circuit was found in the PC documentation from 1996. The maximum current of the motor is determined by the transistor.

1 kHz Astable 4001 (CB24339E)
We found this circuit in the November 1974 Radio Electronics magazine. The frequency depends on C1...
Inverter (CB15717E)
The inverter shown in the figure can generate voltages in the range of 80 to 600 volts depending on the...
Metal locator (CB7883E)
Found in a 1966 documentation, this “coin finder” uses components from the era operating at 2.1...