Author Topic: IDEAL guitar input for AVR/ARDUINO?  (Read 3181 times)

loss1234

IDEAL guitar input for AVR/ARDUINO?
« on: April 18, 2011, 12:03:41 PM »
With its 0-5v input, I was wondering what the best way to feed a guitar signal into the AVR would be. As the straight guitar signal is much too quiet to get
full 0-5v resolution, would it be best to BOOST the signal first? (to a 5 range?)

I assume i need to put a cap first in the chain.

Are there are any examples out there?

thanks so much

 

Hides-His-Eyes

Re: IDEAL guitar input for AVR/ARDUINO?
« Reply #1 on: April 18, 2011, 12:14:01 PM »
Power a Rail to Rail op-amp at 5V and use a Vref of 2.5V. DON'T decouple it but do boost it up using the op-amp. You'll get roughly 0-5V depending on the gain.

loss1234

Re: IDEAL guitar input for AVR/ARDUINO?
« Reply #2 on: April 18, 2011, 12:26:31 PM »
thanks!

isnt the internal reference at 2.6v?


loss1234

Re: IDEAL guitar input for AVR/ARDUINO?
« Reply #3 on: April 18, 2011, 12:33:18 PM »
wait...did you mean VREF on the AVR Or on the OPAMP?

thanks

Hides-His-Eyes

Re: IDEAL guitar input for AVR/ARDUINO?
« Reply #4 on: April 18, 2011, 01:26:09 PM »
I meant produce your own externally at 2.5V.