This circuit was found in the December 1982 Radio Electronics magazine. The components are of types that are still commonly found. The power supply is not included.
We found this peak audio indicator in a 1980 publication. The M1 indicator can be 200 uA with the...
This circuit is from documentation from Analog Devices from the 90s. The circuit uses operational...
This interesting circuit of the American publication Electronics Handbook Volume XIII 1993 shows a...