Go Down

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.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

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.

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.




Go Up
 


Please enter a valid email to subscribe

Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

Arduino
via Egeo 16
Torino, 10131
Italy