This circuit uses common components at the time of its publication in the 1980s. The circuit can be made with modern equivalent transistors. The input signal is sinusoidal.
This circuit is from an American documentation about filters. The operational amplifiers are 741...
This circuit was found in the November 1992 Radio Electronics magazine. The resistor in series with...
When the switch S1 is pressed for a moment, the motor receives the voltage of B1 more, adding to...