Thread: Powering an amp and tablet

i was going to recommend a 5v relay to provide the turn-on wire, though i don't see why you can't use the cars 'acc' wire in the oem harness. the only benefit the relay would provide would be that it would be off the tablets power supply.. but as i understand it, that method wouldn't provide any extra functionality(tablet-on sensing or anything), it'd just be a more expensive method to turning on the amps when the car is turned on..

Yeah, the point of viring the tablet to the switched wire is to run power to it when the car is started, and not otherwise. But does the 12v sw wire carry enough amps to power the tablet and send a signal to the amp?

Noting that that's different to using a 12V relay to turn on the dc-dc converter for the tablet...

Originally Posted by SynGates

Yeah, the point of viring the tablet to the switched wire is to run power to it when the car is started, and not otherwise. But does the 12v sw wire carry enough amps to power the tablet and send a signal to the amp?

as long as it's a newer style amp, then yes-- in most cases, the acc wire is going to be rated/fused for a maximum of a 10A load. typically amps will draw about 0.5A max on the turn-on wire(there was a older mid 80-90's amp model that drew huge amounts of power on the remote wire..), and tablets via usb can not require any more then 2.0A(part of that new usb certification for high power devices).. so your entire system shouldn't see any more then 2.5A draw on the acc wire.

Quick thought: is there anything against taking the 12v for main power to the amp from the 12v wire in the head unit harness? Instead of taking power straight from the battery.

Since I will be using the 12v sw to power the tablet, nothing else will draw current from 12v main wire.

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Only the current limit, voltage drop, and line noise.

Ive gone with another approach. Thank you

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