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Increase Volume for Cirrus audio card with Raspi 2

Former Member over 10 years ago

Hi

I am using the cirrus card with Pi2

I connected an hydrophone to the LINE IN and did some recording but the volume is damn low

How do I increase it???

0 gadget.iom over 10 years ago

You might need a pre-amp.

Something like this may be suitable:
Hydrophone Preamplifier based on Op-Amp OPA37 - Amplifier Circuit
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0 spambake over 10 years ago

Some kind of preamp will probably result in less noise but you might just try boosting the volume in the use case script.

In the script Record_from_lineIn.sh try changing the IN3L Volume and IN3R Volume from 8 to 20 or more. In that same script there are two other sets of volume controls that you can experiment with. Again, this will often result in more noise but that might be acceptable for your purposes.
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0 Former Member over 10 years ago in reply to spambake

Well I'll try it that way
Thanks@spambake
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