Circuit diagram of decibel meter

The decibel meter circuit responds to sound from a pressure level of about 60 to 70 dB. The sound pick-up 8 ohm speaker consists of a transistor and an LM324 stage operational amplifier amplification section. You can also use a dynamic microphone, but the speaker is more sensitive. The four operational amplifier parts of the […]

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Schematic diagram of audio decibel meter

The audio decibel meter circuit uses it not only as a RF device designed for sa604, but also as a received signal strength indicator (RSSI). In cellular radio, the radio microcomputer uses this function to continuously monitor the strength of the received signal. This circuit is a logarithmic response proportional to the input signal level. […]

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