AT PSU

A mate of mine have a old 233 machine, but the switch have gone belly up on it, is there any place to get these switches from?

Failing that then I will have to stick the P2 motherboard in that is lying around and use a ATX psu, but it is being bothered to do that.

Thanks.

What is a "233 machine"? Do you have a manufacturer and model no for the computer or the PSU?

I suspect your only chance at getting an AT PSU would be second hand. You may have to buy a complete second hand PC to get the PSU though.

Maplin for switch?

In reply to a post by TinyMongomery:

What is a "233 machine"? Do you have a manufacturer and model no for the computer or the PSU?

233Mhz Pentium computer, home built as i built it many years ago. I thought you would know what a AT PSU is?

A AT PSU is a AT PSU, ok so there was some strange sizes like there is with ATX.

In reply to a post by ian72:

I suspect your only chance at getting an AT PSU would be second hand. You may have to buy a complete second hand PC to get the PSU though.

that was my thought as well.

In reply to a post by Banger:

Maplin for switch?

I thought of that, not sure what pole they are, will have to check it out and have a wander to Maplins next week.

I know what an AT PSU is. Just buy another one off eBay; there are plensitch? The latter is available onty there. Otherwise, bypass the switch. I doubt you will find the switch that you want for less than the cost of a PSU.

PS - do you mean the switch in the PSU itself or the case switch? The latter is available on eBay for less than a fiver.

Edited by TinyMongomery (Wed 10-Feb-16 19:32:31)

In reply to a post by TinyMongomery:

I know what an AT PSU is. Just buy another one off eBay; there are plensitch? The latter is available onty there. Otherwise, bypass the switch. I doubt you will find the switch that you want for less than the cost of a PSU.

PS - do you mean the switch in the PSU itself or the case switch? The latter is available on eBay for less than a fiver.

I did not think about Ebay for the switch, thanks for that, as you said there is one on there for just under a fiver, I will have to ask my mate, as you said we could bypass the switch and turn of and on at the mains. It is the case switch.

I thought of something last night in that i have not really seen this switch as it is properly, I just had a peak at it and it looks like it is just pressed in, but Maybe the mount it is on is broken, I will have to take a proper look next week. Thankfully the machine have not been required for a while, but he wants to get it back up and running as it is required soon.

Are you sure it isn't a soft switch rather than hard switch (ie doesn't have a physical on/off position)? If it is a soft switch then can they be bypassed the PC would probably just default to off if using the switch on the PSU. Also, how is the switch connected to the PSU? Is it easily swappable?

Haven't worked on PCs with AT motherboards/PSUs in a very long time so can't really remember exactly what the switches were like. I am assuming the switch is wired to the PSU rather than to the motherboard? If not then it is only the switch that needs replacing and replacing the PSU wouldn't replace the switch.

It's not a soft switch: http://www.tomshardware.co.uk/power-supply-specifica...

I thought soft switches were around before the 266Mhz CPUs came about - that suggests my memory is getting pretty ropey...

But that should make replacing the switch a pretty simple matter.

Not a soft switch, dangerous 240 volt, ok 220 volts power running through it. One good thing about the AT psu is that you knew it was off when you switched it off. I woke up early this morning to take some pain killers and heard the low rumbing sound of my computer, for some reason it have switch itself back on.

If it is the switch it is a solder job, i will get another mate to do that as I can't do it now.
I will have to have a good look at it or get my mate to have a look at it. the problem is things have been so busy in the studio for the last few weeks that this machine have been put out of mind until recently.

In reply to a post by TinyMongomery:

It's not a soft switch: http://www.tomshardware.co.uk/power-supply-specifica...

Never realised they may have spade connections, i thought they would be soldered with those sort of voltages. that is a interesting page.

In reply to a post by ian72:

I thought soft switches were around before the 266Mhz CPUs came about - that suggests my memory is getting pretty ropey...

But that should make replacing the switch a pretty simple matter.

I can't even remember what board is in it, I think it is a gigabyte, got 2GB of ram, which is a fair bit for that time, He have got all the SDram I had just in case something goes belly up with the ram.
He even got a old P4 machine which is not in use that have Rambus memory, now that stuff was suppose to be the replacement for SDram but it cost too much and DDR came in which was cheaper.

I have to reinstall Windows 98 on it at some point anyway, got a few problems that I could not solve when I mucked about with it before the switch went. .


i was saying to my mate last week that my phone got more processing power that the computer have got, scary really how things have come along.

Only for someone that has the skill.

The switch could be bypassed and either switched at the mains socket, or an inline switch

fitted in the mains lead.