This digital instrument input circuit was found in the September 1989 issue of Radio Electronics magazine. The circuit has a high input resistance.
The operational amplifier 747 is old, no longer being used, but the configuration is valid for...
This circuit, from an American publication from 1971, generates a 25 Hz sinusoidal signal. Note...
In this circuit, from a 1977 publication, we have the traditional version of a filter tuned to 1...