Hello,
I want to run my car amplifier with computer power supply, but power supply turns on and off when connected to amplifier. This happens because amplifier draws alot of current for short time when it`s turned on... Even 2A chinese laptop adaptor manages to keep it running...
So I would need to disable over current or under voltage protection on my PSU.
I had found that many people managed to disable it, but I didn`t find example on PSU that uses same ICs as mine...
Could someone please take a look what pin(s) do I need to cut or short to GND to disable it?
Here are the PDFs of ICs:
https://www.fairchildsemi.com/datasheets/FS/FSDM311.pdf
http://www.ha6gg.hu/dlds/AZ7500EM-E1.pdf
AS339P-E1 pdf, AS339P-E1 description, AS339P-E1 datasheets, AS339P-E1 view ::: ALLDATASHEET :::
I suspect that protection is triggered in FSDM331 IC, but I can`t say for sure.
Thank you for help 🙂
I want to run my car amplifier with computer power supply, but power supply turns on and off when connected to amplifier. This happens because amplifier draws alot of current for short time when it`s turned on... Even 2A chinese laptop adaptor manages to keep it running...
So I would need to disable over current or under voltage protection on my PSU.
I had found that many people managed to disable it, but I didn`t find example on PSU that uses same ICs as mine...
Could someone please take a look what pin(s) do I need to cut or short to GND to disable it?
Here are the PDFs of ICs:
https://www.fairchildsemi.com/datasheets/FS/FSDM311.pdf
http://www.ha6gg.hu/dlds/AZ7500EM-E1.pdf
AS339P-E1 pdf, AS339P-E1 description, AS339P-E1 datasheets, AS339P-E1 view ::: ALLDATASHEET :::
I suspect that protection is triggered in FSDM331 IC, but I can`t say for sure.
Thank you for help 🙂
PC supplies may drop-out with UNDER-load.
Put an old hard drive on a spare connector. Does it now stay-up?
Put an old hard drive on a spare connector. Does it now stay-up?
what kind of power supply you are trying to use? How do you start it? What pins from the connectors are you using to get your voltage?
Did you measure the voltage before connecting it to the amp?
Did you measure the voltage before connecting it to the amp?
How to I make the limiter? I googled for dc inrush current limiter, but couldn't find anything usefull.
Thank you
Hello,
I'm using 400w power supply, 15A @12v. I jumped ps-on (green wire) to ground. I desoldered all other wires except yellows and blacks and tied them in 1yellow and black loom. Voltage is 12.40v. I did this many times before, so it's done right
If the psu in question has a single 12v rail this shouldn`t be a problem.
If it has multiple 12v rails this can be a problem I think.
You could measure the 12v cables resistance to each other, if its below a few ohms it should probably be alright to connect them together.
If it has multiple 12v rails this can be a problem I think.
You could measure the 12v cables resistance to each other, if its below a few ohms it should probably be alright to connect them together.
Hello,
It`s a single rail 12v, I have the board out of the casing currently and yes all yellow wires are coming from the same trace.
I tryed 2 different PSUs and both did the same, than I tried the third and it stayed on, but I can`t use that one because it makes whining noises. However I measured the current and on turn on it goes only to 2A, than it drops to 1,5A... So I think that overcurrent is not a problem, except if my DDM is not fast enough to show the "spike".
I had just found out that PSU doesn`t turn off if I have DMM connected to measure voltage over 12v and GND... Voltage with nothing connected is 12,10v and drops to 11,8v when I connect the amplifier... what could that be, should I try to connect lagre value resistor over 12v and gnd?
Is this an ATX power supply ?
Have you connected the green wire to a black wire ?
An ATX psu, needs a ground at the green to turn on.
Have you connected the green wire to a black wire ?
An ATX psu, needs a ground at the green to turn on.
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