Suggested by Maxim in documentation from the 90s, this circuit has its response curve given next to the diagram as well as the formulas for the component calculations.
This instrumentation circuit is from the June 1986 issue of Radio Electronics magazine. Equivalent...
This 2000 circuit can be used to match the low impedance of a microphone to the high input...
This sensitive two-transistor circuit was found in the June 1965 Radio Electronics magazine. The...