Atx Psu ?

[Ex-Bay]

I understand that the PSU in a PC needs a load of some sort on one or more of its outputs. Can anyone advise me what sort of load/s would keep it alight?.

I've had to change one on my old Athlon (Abit KB7? mbd) which the missus uses (yes, it was the PSU that went sour). But I noticed that the 12v output is anything up to 12A and at 15 quid, it's worth trying for use on my Transmitters.

Would it handle a varying load (FM Tx) from, say 2A to 8A when the PTT is pressed ?

DT_Xtremez_26:

 

[PVRisthefuture]

I understand that the PSU in a PC needs a load of some sort on one or more of its outputs.

But I noticed that the 12v output is anything up to 12A and at 15 quid, it's worth trying for use on my Transmitters.

Do it then, it's only £15.

Would it handle a varying load (FM Tx) from, say 2A to 8A when the PTT is pressed ?

Well, 8A is less than 12A, so, why not? Give it a welly, thought you were a techie! What's the worst that can happen?

Were you pals with Derek Shaw by chance? All TG3 bods will know were this is going...

 

[CodeMonkey]

Check out the linky

 

[PVRisthefuture]

Check out the linky

Good site. XB should have all he needs to ham radio the wee hours away!

 

[Ex-Bay]

Thanks guys.
$115 is rather a lot for what I need at present.
Sorry PVR, I don't recall the name Derek Shaw.

Some SM power supplies do not like the sudden change in a load, hence the question. The connection details are most welcome, confirming some info I found earlier.

But my only 'worry' is that I don't know which supplies require a load to boot them up. So, for example, if the required load is normally seen on the +5v, I can use a small incandescent lamp, a load resistor or even an LED. I plan on LEDs on the case anyway.

Lastly, this one's not for me (I prefer a linear PSU; much less noise), it's for my local spaceys.

DT_Xtremez_26:
--------

Incidentally, I tried the new PSU in the PC earlier. It does not light up !

DT_Xtremez_09:

 

[CodeMonkey]

Thanks guys.
$115 is rather a lot for what I need at present.
Sorry PVR, I don't recall the name Derek Shaw.

Some SM power supplies do not like the sudden change in a load, hence the question. The connection details are most welcome, confirming some info I found earlier.

But my only 'worry' is that I don't know which supplies require a load to boot them up. So, for example, if the required load is normally seen on the +5v, I can use a small incandescent lamp, a load resistor or even an LED. I plan on LEDs on the case anyway.

Lastly, this one's not for me (I prefer a linear PSU; much less noise), it's for my local spaceys.

DT_Xtremez_26:
--------

Incidentally, I tried the new PSU in the PC earlier. It does not light up !

DT_Xtremez_09:

when you short the PS ON line the supply should turn on all it's loads. The Purple(+5V Standby) should be permantly high or perhaps high when the PSU is off. I haven't got a spare one lying around to confirm this though.

 

[Ex-Bay]

Further investigation this evening produce not a flicker, but it is NOT a 400 supply, but a 250w.
So the 400w supply will be experimented with to get +12 v for something else (like the transmitter).

Quote CM: when you short the PS ON line the supply should turn on all it's loads. The Purple(+5V Standby) should be permanently high or perhaps high when the PSU is off.

By 'high' you mean unconnected or connected to the +5v output. ?
The PS ON is a green wire. Connect to earth ?

 

[CodeMonkey]

Further investigation this evening produce not a flicker, but it is NOT a 400 supply, but a 250w.
So the 400w supply will be experimented with to get +12 v for something else (like the transmitter).

Quote CM: when you short the PS ON line the supply should turn on all it's loads. The Purple(+5V Standby) should be permanently high or perhaps high when the PSU is off.

By 'high' you mean unconnected or connected to the +5v output. ?
The PS ON is a green wire. Connect to earth ?

(Assumption here)As in it should be at +5V when the PSU is receiving power from the mains but the green wire is not shorted to earth.

If you can give me a while i'll yank a PSU out of a tower i have and test it out for you. There may be slight delay but i will try it out for you.

 

[CodeMonkey]

Just back from ripping a PSU out of a tower.

Just back from ripping a PSU out of a tower.

Ok i have just tested the following(re-worded because mrs CM thought it sounded like a dig)

Short Pin 14 - PSON(GREEN) to Pin 13 - GND and the PSU switches on. I measured +12V and + 5V on the molex connectors. You must leave the shorting link in place for this to work.

As for the +5VSB(Purple) it remained high when the PSU output was switched on or off.

I also confirmed the other voltages present as listed on the link earlier.