We found this circuit in a 1973 publication. The circuit lets frequencies below 480 kHz pass through with an output impedance of 1k. The circuit can be implemented with current operational.
This amplifier was obtained in an Electronics Now based on the LM1875. The circuit must be powered...
The block shown in the figure, although it is known to many readers, is not always in everyone's memory...
This high-power circuit was found in a documentation from the 90s. The circuit can use more...