AMP9-BASIC and DCDC-USB, anti-thump question
I'm working on building my first carputer. Things are progressing nicely but I have a question about preventing a thump when the amp gets power. The way I understand it, the amp needs to get power first and then turned on after that. If it's turned on first and the power is supplied, the speakers will give you a nice loud thump.
I have an AMP9-BASIC from 41hz.com for an amp and a DCDC-USB for a power supply.
According to the spec for the amp:
Pin 1 - 2 VPP + 5Vreg CLOSED to Awake (NORMAL), Open to Sleep. (this looks to be the "on" pins. If I short the pins, the amp will turn on. However, if i put a jumped on the pins and permanently short them, I think I will experience a thump every time I turn on the car)
DCDC-USB manual says:
Vaux: Provides unregulated switched input, to be used in automotive modes
to power various peripherals. Also, in automotive mode, Vaux can be used as
‘thump’. Vaux should be closer to V(In) in this case.
This means I can't hook up the Vaux directly to the amp's pins 1-2, right? I think I need to use the relay and have it short pins 1-2 when Vaux kicks in.