Audio Decibel Level Meter


Posted on Feb 5, 2014

This is a circuit of Audio Decibel Level Meter. This circuit uses the SA604 which not only designed as an RF device but also the Received Signal Strength Indicator (RSSI). In a cellular radio, the radio`s microcomputer uses that function to monitor the received signal strength continuously. A logarithmic response proportional to the input signal l


Audio Decibel Level Meter
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evel is given by this circuit. The logarithmic response that can be provided by The SA604 is over an 80dB range up to a 15MHz operating frequency. Here is the circuit : To build a sensitive audio level indicator circuit, we can uses two integrated circuits: the SA532 and SA604. This circuit requires less than 5mA with a single 6V power supply. So it is ideal for portable equipment that use battery as power supply. This circuit has some advantages such as 10. 5mV sensitivity, low-power consumption belie the 80dB dynamic range, and has small size.




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