I remember back in the day some ATX power supplies used to have an additional IEC connector on the back, sort of like this:
That was handy. Anyone know why they don't see to do that anymore?
It is not useful anymore because the power supplies usually are not switched on/off using the mains switch anymore (although it is often still present) so the "switched output" would be ON all the time.
The invention of the power strip?
-- John Larkin Highland Technology, Inc lunatic fringe electronics
Because you can exceed the rating of the power inlet cable? Cost? Additional EMI testing? Left over thing from the old XT class IBM machines with a single monitor?
Cheers
I had a guitar amplifier once that had a really nice feature - it had a standard 120 volt outlet in the back near the power lead input.
You could then actually put the power strip in the hollow space in the back of the amp, run all your other equipment from that, and only have one power cord to plug in for your performance.
Looks like the power supply on that old BeBox didn't do power factor correction, judging by the 120/220 input voltage switch.
On Sat, 25 Jun 2016 16:00:38 -0400, bitrex Gave us:
It was for the display.
And it was IIRC in the pre-ATX days.
Why? Maybe the spec changed, because it meant the 'entry module' on the supply where the filters are would have to be bigger (the filters)
On Sat, 25 Jun 2016 15:02:08 -0700, John Larkin Gave us:
Nice try, but no. They were around already.
On Sun, 26 Jun 2016 00:35:24 -0400, Martin Riddle Gave us:
Not likely. Even the CRTs used less than the early ones. So it got easier not harder.
Especially the color monitor; that first RGB color display from IBM would burn up if you left AC power on it when the PC was off. As I recall, the HSYNC signal was required to set timing on the switchmode supply.
More recently (1993?) Apple's ADC connector supplied power to the monitor only when the computer was awake; it was kinda nice that the monitors didn't need any AC socket, and power/DVI/USB/speaker wires were all one cable.
Yes. Photo is of an AT style powered PC; the power switch on the front was a true DPST or DPDT switch, so the connector and the supply "ran" from the output contacts.
The ATX style/design is NEVER off (if you keep the input power on). And the design people were too stupid to use a triac for control..
What is that for? Hitting baseballs or people?
That's supposed to be (2003?) for the ADC connector. There was a big AV connector (HDI-45 or somesuch) in the nineties, but it wasn't ADC.
Maybe you use a married monitor?
They were intended to remove power from your monitor when you power off, but then there were soft-power-off signals added to the video cabling and the software drivers so there was no need for it any more.
It was there to power old type vacuum tube monitors. Nowadays, LCD monitors are generally powered by 12V DC
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s/color/monochrome/
All of the monitors I use (both home and work) are line powered.
On Sun, 26 Jun 2016 10:32:16 +0100, TTman Gave us:
Ummm No.
Today's monitors are powered by line voltage and INTERNALLY they have DC supplies which power the internal elements. Very few have external AC to DC supplies and connections.
rNumeroUno:
There is quite a few that have an external 12V supply and there is beginnin g to be some that gets 12V power and video via usb3
-Lasse
These connectors form a significant cost in commodity builds and the mating part is seldom provided by monitor vendors, who increasingly rely on wall warts.
Any practical effect at reducing clutter or improving convenience is minimal/lost, as more hardware is piled into the connector equation.
RL
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