Trying to hook up a Lepai LP168HA to my car - diyAudio
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Old 1st July 2014, 04:38 PM   #1
leosep is offline leosep  ominican Republic
diyAudio Member
Join Date: Jan 2013
Default Trying to hook up a Lepai LP168HA to my car

Hi, how are you all?

Im trying to hook up a Lepai LP168HA to my car. First i tryed to use the voltage cable of the dash radio, the red power light is on but no sound at all, then i tryed to use a 12v 2A lighter adapter and it worked, red light plus sound. But the thing is that i need the lighter socket and i want to connect the lepai amp to the voltage of the car or battery. So i decided to buy a voltage regulator and the same thing happened, red light on but no sound at all. The volt regulator gives me 11.6v using a multimeter, with the car on and off. So i dont understand whats happening. Why does it work with the lighter adapter?

Type: LP - 168 ha
Size: 17.6 cm * 10.3 cm * 4.3 cm
Bass power: 68 w
Or so channel power: 40 w * 2
Work power: DC14.4V (current > = 3 A)
Lepai LP168HA Motorcycle Car Audio Stereo 2 1 CH Digital Amplifier 40W 2 w P A | eBay

Voltage Regulator:
Info: DC/DC 24V Step down to 12V 60W 5A
Input voltage: DC 24V (12-40V)
Output parameter : DC 12V
Output power: 5A 60W
Size : 66 x 59 x 23mm
Pitch of holes:55mm
Diameter: 6mm
Wire length : 180mm
Shipping weight: 123g 4.4oz
Minimum pressure: 2V
Working temperature: (-40 ℃~80℃) when it is more than 40℃,please make lower power, or enhance heat dissipation
Full load temperature rise: 50℃
Load regulation: 1%
Voltage regulation rate: 2%
Schronous rectification, conversion rate is 90% with very low heat.
Waterproof DC DC Converter Regulator 24V 12 40V Step Down to 12V 60W 5A | eBay

Lighter adapter:
12V 2A
tip size 5.5mm 2.1mm

Last edited by leosep; 1st July 2014 at 04:47 PM.
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Old 3rd July 2014, 12:54 AM   #2
leosep is offline leosep  ominican Republic
diyAudio Member
Join Date: Jan 2013
anybody? any ideas?
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Old 3rd July 2014, 01:01 AM   #3
diyAudio Member
nigelwright7557's Avatar
Join Date: Apr 2008
Location: Carlisle, England
You are maybe getting too much voltage drop on the wiring except for the lighter socket which will supply a few amps. And the amp is refusing to start.
Try it from straight across the battery to prove the point.
PCBCAD50 software.
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