Found in Motorola documentation from the 90's, this circuit has a high input impedance. The power supply must be symmetrical. The circuit can be implemented with modern operational amplifiers.
This is the simulation of a Ultrasound Receiver using the 741 IC, an operational amplifier....
This car amplifier was found in the 1982 SGS Linear Integrated Circuits manual. The circuit can be...
The circuit shown in the figure activates a small indicator lamp that will start to flash when the...