Preamp Mic vs Direct Mic Input for 12V Intercom Amplifier with 6 Ohm 5W Speaker

Hi guys, i have a question about my project,  is there any difference or influence if i use preamp mic or not on my intercom? So the input from microphone just through on amplifier 12 v and then go out by speaker 6 0hm 5 watt. Could i ask a suggestion about the best amplifier circuit for 12 volt?

Faishal, the LM383 at 7W output seems overkill for an intercom.  and if you're making an intercom, have you thought about using the speaker as a microphone?  There is a very simple circuit for an intercom on the data sheet of the LM380 (a 2W amp that does not require a heatsink) here (fig 18) using the speakers as microphones but you'd need to source a 25:1 audio transformer which may or may not be easy.
If you're committed to the LM383, for 1W out it would need a signal of roughly 10mv so would probably work with a microphone (depending on the type)  but a preamp is probably not a bad idea, especially if you can introduce a bit of compression (loud inputs are amplified less than small inputs, resulting in a more level output over a wider range of inputs).  You can adjust the gain of your LM383 by adjusting the ratio of R3 / R1 (the higher the ratio the higher the gain).  If you can't get a loud enough output then try using a preamp.

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