The cut-off frequency of the circuit shown in the figure is 750 Hz, with the components used. The circuit applies to almost any operational amplifier and the power supply must be symmetrical.
With this circuit it is possible to use an oscilloscope as a quick component test, checking its...
This circuit also functions as a phase detector. The components used are not common. We found this...
Using period transistors, this 10 W amplifier was found in Radio Electronics magazine from May...