I need to make a soudmeter (in dB), reviewing the information I found with the application note AN1991. Now I have any doubts.
1. For the audio input can I use a microphone of type Electret Condenser ??? (Manufacturer Part Number: POM-2735P-R ).
2. It is necessary a pre-amplifier stage for the microphone or can you connect it directly to the audio input?
3. Can the SA604A work in the badwidth of 20 Hz to 20 KHz.
4. The range of mesurement is between 50 dB to 100 dB.