I've just finish yesterday to assemble 2 AMP5 modules for my active speaker project.
They work nice, that's great, but there's something i don't understand about the logic for the relay.
On AMP5, the relay is open if the TA2022 is asserting the MUTE signal, and the relay is closing when the Tripath is de-asserting the MUTE pin.
What's the benefit of having here a relay?
Shouldn't the relay logic be as follows (in a switch on/switch off procedure):
1. Switch on the AMP, MUTE is initially asserted while the rail voltages are below the minimum.
2. MUTE is de-asserted.
3. DELAY (to be added, not currently on amp5)
4. Relay closing after delay elapsed.
5. Enjoy your music
6. Turn off -> the relay is opening immediately!! (this is currently not performed)
7. MUTE is asserted when the tank capacitors have discharged
8. The amp is off
This way there wouldn't be any commutation 'plok' in the speakers when turning the amp on and off.
Or am i going nuts?