We found this measurement circuit with a logarithmic scale in an Electronics Now from November 1995. The circuit uses an integrated component from that time.
This circuit is from an English magazine of 1977. The circuit is still current, just using BC547...
This circuit was obtained in an old Elektor. It is a reference, since the integrated products of the...
This circuit was found in a European technical documentation from 1991. It is a circuit that must...