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 circuit allows the testing of integrated circuits of type 741 (operational amplifier) such as...
This circuit is from the LM3914 manual and can be found elsewhere on this site and from other...
This circuit, which can be seen elsewhere on this website, was obtained from a 90’s English...