Jeg synes helt klart, at du skal teste lydkortet, før du poster flere penge i projektet. Her er lidt info om kortet:
DAC: Cirrus Logic CS4398
Denne chip bruges i et hav af portable enheder i alle prisklasser.
AMP:
Maxim MAX97220A"The MAX97220 is a differential input DirectDrive® line driver/headphone amplifier. This device is capable of driving line level loads with 3VRMS into 1kΩ with a 5V supply and 2VRMS into 600Ω loads from a 3.3V supply. A headphone load is capable of being driven with 125mW into 32Ω with a 5V supply. The IC is offered with an internally fixed 6dB gain or an externally set gain through external resistors. The external gain setting nodes can also be used to configure filters for set-top box applications. The IC has exceptional THD+N over the full audio bandwidth."
OPAMP (
kilde):
JRC 2114 opamp for headphone out
JRC 4556A opamp for line out