Hey guys,
Can anyone tell me a simple circuit that can be used to connect a sensitive mic (most simple mic) and a speaker (cheap USD 1 kinda). I want to scream at the microphone and output voice from speaker. At the same time I want to see the output from microphone by using analogread() in arduino. So can anyone point me to a simple circuit that can connect a mic with a speaker.
Thanks guys. Hope all had great christmas 
Is the Arduino part of this important? I assume you're posting this from a PC so it's pretty straight forward to connect a microphone and speakers (most likely you already have them connected) and use a simple recorder application to capture and display the wave form.
If you want to do it without using your PC, you'd need to connect an amplifier between the mic and the speaker (you can get them cheaply). You don't need an Arduino for that either. With that working, there's nothing to stop you using an analog input on your Arduino to digitise the analogue signal, although the Arduino would only be able to measure positive values so you'd need to add a DC bias if you wanted to see the whole wave form. Your PC already has the hardware and software to do this for you, though.
One thing people don't like around here is cross posting, that is asking the same question in multiple threads.
You have already asked this question today and if you didn't understand any aspect of the answer you received then you should ask again in the same thread not just start another thread on the same subject.