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11.2.1 Checking Amplification
If all your AC and DC conditions are correct then let's do an AC amplification test as a final
check.
Install the DUMMY 8 ohm 10W resistors across the 8 ohm speaker posts – then power on the
amp and play an audio CD test through the amp. Adjust the volume to halfway and
measure the AC voltage across the 8 ohm resistors – you should be able to adjust the
volume and see the value change accordingly – at zero volume you should see zero output
signal.
As a final test I might suggest that you use an old pair of speakers to do a final test and let the
amplifier run for an hour or so. Listen to the music and verify that there is no hum and all is
working properly.
