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[on:]

i researched google quite a bit to get something to amplify the signals of a mic.
i have been thinking, what is the problem of using an op amp?
wont that work?

[Reply #1 on:]

Op amp would be fine.
Use one that will work with a 0/5V supply, bring your mic in thru a capacitor to an input pin; use 2 10K resistors to have the pin sit at 2.5V.

http://www.electronics-tutorials.ws/opamp/opamp_3.html

[Reply #2 on:]

please show me the breadboard view of the schematic with the ca3140 .
also, wont a simple transistor work?

[Reply #3 on:]

please show me the breadboard view of the schematic with the ca3140 .
also, wont a simple transistor work?

Don't get greedy, it is such a simple circuit it will do you good to lay it out yourself.

No you can't get that much gain out of a single transistor.

[Reply #4 on:]

You might consider buying an op-amp breakout board like this one for $5:

https://www.sparkfun.com/products/9816?

Or even better here is a breakout board with a Mic and a built-in amplifier for $8:

https://www.sparkfun.com/products/9964

I used the latter successfully in an Arduino project that took Mic input, applied a ring modulator effect, and then played the output on a speaker. Here is a link with circuit diagrams and code:

https://github.com/andygrove/arduino_dalek_ringmodulator

Hope that helps.