FM Radio Essentials
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Audio amplification continued
The output of the NCP2890-D uses two op-amps that are connected in a differential configuration. The second
amplifier produced a 'mirror' (or reverse) of what the first op-amp produces. The output of one feeds OutA and the
other feeds OutB. This configuration allows twice the power to be generated compared to amplifiers using a single
op-amp configuration.
The rest of the components are needed as follows:
R7 is the volume control potentiometer. C5 and R12 filter the input signal. C7 increases bass response by allowing it
to bypass R13. C11 and 12 keep the power supply to the IC smooth.
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