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Topic: amplifying mic signals in an arduino (Read 1 time) previous topic - next topic

harshvardhan

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?

CrossRoads

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

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
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harshvardhan

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

Grumpy_Mike


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.

andygrove

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.




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