This circuit is from a 1968 Motorola power circuit manual. The circuit uses transistors of the time. The passing band is 45 Hz to 100 kHz.
This filter is from 1978 documentation. The source must be symmetrical and the gain in the center of...
This circuit is suitable for calibrating old oscilloscopes. It was found in a 1980s documentation. It...
Found in a 90s American documentation, this circuit uses an integrated from the time that is...