The purpose of this circuit is to measure the intensity of audio signals. We found it in the September 1990 issue of Radio Electronics magazine. The circuit works as a S meter.
The presented circuit is suggested by Texas Instruments (www.ti.com) in its Application Report...
This circuit with an industrial standard 4-20 mA interface uses a KPZ20G pressure sensor but can...
This circuit takes advantage of the inductance of the coil of a high-impedance phone to form the...