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.
We found this circuit in a 1977 Radio Handbook. The JFET can be of any type and the adj can have...
This double-T sine wave oscillator was found in the December 1995 issue of Electronics Now...
This limit alarm was found in a 1980s US documentation. Comparators can be equivalent and the...