Finding out a power supplies max. capacity on the plain circuit board

Thread Starter

mmtomm

Joined Jan 19, 2021
2
Hi,

I've been searching to find out the max. capacity in amp from a power supplies circuit board, but I could not find any information about it.
PXL_20210119_162524747.jpg
It was built into a DVD-Player and has 5/12/-22V Outputs to the right:
PXL_20210119_165345201.jpg

I like to use it for LEDs and want to find out how many ampere it can resist
Thanks for helping
Tom
 

ericgibbs

Joined Jan 29, 2010
13,280
hi Tom.
Welcome to AAC.
Which type of LED are you planning to use.?
The 12Vdc will the highest current rating, it was probably used to power the DVD motor.

E
 

andrewmm

Joined Feb 25, 2011
1,646
Its from a chines supplier
https://www.expressluck.com/
it looks like a paper , two sides PCB so it should be possible to generate a schematic from it if you want to, but I'd suggest that some of the parts are going to be hard to identify , so you will be no closer

To power leds, you need a current limited supply , if the leds do not provide that, then you will have to add the circuit.
 

Thread Starter

mmtomm

Joined Jan 19, 2021
2
hi Tom.
Welcome to AAC.
Which type of LED are you planning to use.?
The 12Vdc will the highest current rating, it was probably used to power the DVD motor.

E
Hi Eric,

thank you.
I'd like to use several SMD LED stripes 12V DC each with 8 watt consumption. The question is, how many of them I can attach?
Tom
 

ericgibbs

Joined Jan 29, 2010
13,280
hi Tom,
I assume the 12VLED strips have inbuilt current control and are as you say 8Watt.
Current = 8W/12V = 0.67A.
At first try just one strip, measure the 12V, run for about 10 minutes, UNPLUG and check for any overheatin on the PCB.
If OK, try adding another strip and repeat test.
I would say that a maximum of 3 strips maybe possible.

Check as you go, lets know any findings.
E
 
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