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Audio Decibel Level Meter (SA604)

2016-01-09 14:54  
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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 level 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 :

Audio Decibel Level Meter circuit schematic

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.

There are some equipments that can use this circuit:
1. Microphone tester
2. VU meters
3. Audio dynamic range testers
4. Audio spectrum analyzer
5. Portable acoustic analyzer
6. Audio analyzers (THD, noise, separation, response, etc.)
7. S-meter for direct conversion radio receiver

This article describes the Audio Decibel Level Meter (SA604). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components:SA604.

 


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