This circuit allows the listening of undersea sounds using a special transducer. Operational amplifiers can be of any type. The circuit was found in a Popular Electronics from the 90s.
This circuit, from a 1973 publication, shows how to obtain a fast, low impedance output for a 741....
This circuit was found in a 1999 documentation, but the components it uses can still be easily...
This overtone oscillator can generate signals up to 150 MHz. The crystal determines the frequency and...