Switching Mac PSU's @$$Bits + ATX = ?????

[Trash80toHP_Mini]

I'm looking at the derriere of my SuperIIsiHack™ and deciding that I'm not going to chop a big rectangular air vent outta' the poor thing as originally planned.

I don't give a rodent's rump about keeping the tail end of my IIsi stealth, I'm going to have t hack way too many I/O connectors onto it for that.

HOWEVER:

I'd really like to hack the replacement ATX PSU to make use of the existing circuit, and switching PSU connectors. These are mounted to the back of the empty, original IIsi PSU's sheet metal that will be acting as a support for the long thin ATX replacement. There's even a handy femal connector terminating all the wires for the AC connector block. The matching, keyed 6 pin header will be easily harvested from the DOA IIsi PSU's PCB.

OBSERVATIONS:

It looks like:

PIN #1 AC-Out (Monitor) Connector's Hot wire is fed back from the Circuit Board (relay/solenoid?).

PIN #2 N.C. (with wider spacing for keying the connection)

PIN #3 Neutral Wire passing through/around Ferrite Ring from AC_In

PIN #4 N.C.

PIN #5 Hot Wire running from AC-In at solder junction with wire to PIN #6

PIN #6 Hot Wire passing through/around Ferrite Ring aside Neutral from AC_In

The hot wire for the AC-Out on PIN #6 appears to originate from a solenoid and is fused before making its way back to the "Monitor Plug."

QUESTION:

Can such a Relay/Solenoid Setup (at least I think that's what is going on) and Fuse be safely added in between the ATX PSU and the original IIsi (or other Mac PSU's Bits) in order to retain the switching function for powering up the Monitor/Whatever?

 

[techknight]

I'm lost. Not quite sure what your saying. I have never used the accessory AC jack on a mac, so i dunno.

But you say when the unit comes on, this secondary AC output is switched? kinda like an old stereo?

If so, then a simple 12v relay would suffice, drive the coil from the 12v of the power supply. power supply comes on, relay clicks, and sends the 120v/240v from the main line in to the accessory line out.

 

[Trash80toHP_Mini]

Nope, you got it . . . :approve:

. . . and apparently I got it too! 8-o

I'll be adding that circuit to my theoretical Universal ATX Conversion PCB! Thanks!

Especially with my MPD and also with my two 12" RGB PizzaToppings™ I'll want them to power on and off with whatever IIsi, Q700 or DuoDock I set them upon.

It's especially nice to use the "Monitor Outlet" for turning on the SCSI Chain on a Mac that I've got hooked up to the 17" Sony or one of the four 21" - 22" Sleeping Beauty CRTs.

I've got one ATX PSU that would work OK for the IIsi in hand, a much better one on the way and a third candidate that I'm looking into acquiring.

I have projects galore waiting in the wings for any ATX PSU overage. )

 

[Trash80toHP_Mini]

My "stealth" IIsi PSU arrived today! [] ]'>

HP Pavilion Slimline s3200n s3000 s3100n Power Supply

I'll post some pics, mine's black (at least the empty sheet metal is black, mine's naked ATM) manufactured by APEVIA Model ITX-AP250W

250W Continuous Power Rating

6A input vs. the IIsi's 4.2A

15A on the +5V rail vs. the IIsi's 6.8A

16A on the +12V rail vs. the IIsi's .8A

-12V rails are the same at .03A

2A +5Vsb vs. 1mA +5VPSTRICL (whatever the heck THAT means)

16A on a useless 3.3V rail

With a little filed off of the sides of the PCB, it should nest inside the IIsi PSU's original Sheet Metal facing upside down. Putting it upside down clears the cubic necessary for the original power plug to be reinstalled in place and more cubic remaining in the back for the original power plug block and a relay equipped Switched PSU adapter PCB.

I didn't expect it to arrive quite yet, but I stopped by Radio Shack and picked up:

SPDT-Miniature

PC Relay

12VDC coil

Rated 10A at 120VAC/24VDC

. . . it must be te good stuff: "Made in Taiwan" :approve:

. . . mainland China can kiss my ( | )

. . . so three guesses as to where the PSU was made for HP . . . :

Be that as it may . . . does this sound like the right relay for the job?

I think I'll be putting the two fuses Sony placed in the original PSU for AC input and output to the monitor plug on the adapter PCB . . .

. . . apparently this feature was overlooked.

 

[techknight]

It should work just fine. Ive seen relays like this used continuously in just about every TV power supply I have seen.

Personally, I would have use an automotive style relay with the harness/pigtail cable as thats easier to work with than making a PCB, but either way works fine. Only thing with automotive relays, most are SPDT

 

[Trash80toHP_Mini]

From the SuperIIsiHack™ thread . . .

I just doodled out the basic PCB requirements for my stealth 250W ITX PSU upgrade at work today. Gotta fire up the vinyl cutting plotter for making my first new PCB masks in a decade. CrapShack/PhoneHut is getting back to its RadioShack Roots just in time . . .. . . they've got DS Copper Clad FRP & Etchant in stock again! 8-o

I've got what I need for converting the non-switching ITX PSU to a switching IIsi PSU in hand already. I can harvest the AC I/0 headers for installation on the adapter board, the Wiring Harness/Mobo Connector and possibly the two fuse holder clips off the DOA IIsi PSU's PCB. The power connector and wires can be desoldered from the ITX PSU's AC socket and then soldered to the fused output pads of the Adapter PCB. Then that can be plugged right onto the ITX PSU's input headers.

I'm going to go ahead and make a few simple home-etched boards for the project, with a prototyping area included for any Soft Power Shenanigans that might become necessary. I'll make sure the PCB is compatible with the Q700 Stand-In PSU I have on hand as well.

This is the part I really like, fabricating prototype PCBs on site. :approve:

 

[Trash80toHP_Mini]

Well, I swiped a file across the sides of this ITX PSU's PCB for a while and now it fits inside the IIsi PSU's sheet metal. It actually fits between the side rails of the lid, but I'm not going to mount it that high in the donor box.

I'm planning to use 1/4' -1/2" standoffs from the lid, or the equivalent height standoffs from the base of the IIsi PSU Can. This will allow an airway from the top vent, back across the "bottom" of the ITX PCB, down into the main section of the IIsi PSU Box near the back, where it will be sucked through and out of the case in the front by sheet metal ductwork leading to a good sized fan mounted underneath the FDD and blowing the hot air from the ducting out the bottom of the case through vanes directing it to the right.

The stock fan will be reversed, pulling more hot air from the case proper and I'll be replacing the speaker with another fan pulling air into the case through vanes set to draw it from the left side of the case. Ductwork from this fan will direct cool air around and over theHDD ro cool it and the Rocket's HeatSink RAM etc. and then it will pass back out the reversed stock fan. Some of the intake fan's air supply may be drawn in from the back of the Subterranean PDS Card expansion area, possibly all of it, cooling those cards mounted under the MoBo as well.

Dunno, gotta do some ductwork calculations once I get the sizes of all the holes, ducts, fans and the directional change radii to get the pressure losses dialed in. Mostly I've done this stuff for Dust Collection Systems with 4" - 8" diameter ducts . . .

. . . this is just a bit on the small side! : Good thing my local lil' bro (the ME) does this kind of thing in blade servers for a living . . . maybe he'll humor me by taking a look at the cooling plan.

A Q630 type speaker jammed into the front somewhere should give a lot better base response for the custom countdown startup chime . . .

. . . followed by the much missed WHOOOOSH!!!!!!!!!!!!! of the Radius Rocket's Launch. :approve:

 

[Trash80toHP_Mini]

IIsi Switching Power supply Block (from above) cable to PSU PCB and Connector Pinout

PIN #1 AC-Out (Monitor) Connector's Hot wire is fed back from the Circuit Board (relay/solenoid?).

PIN #2 N.C. (with wider spacing for keying the connection)

PIN #3 Neutral Wire passing through/around Ferrite Ring from AC_In

PIN #4 N.C.

PIN #5 Hot Wire running from AC-In at solder junction with wire to PIN #6

PIN #6 Hot Wire passing through/around Ferrite Ring aside Neutral from AC_In

IIcx, IIci, IIsi, Quadra 700 Power Connector

PIN DEFINITION

1 +12V

2 +5V

3 +5V

4 +5V

5 ground

6 ground

7 ground

8 -12V

9 power good

10 +5V (or power on circuit supply voltage)

 

[olePigeon]

As you know, I'm looking to upgrade my IIci's power supply. How much would one of your universal adapters cost?

 

[Trash80toHP_Mini]

Dunno, I'm figuring on sending you one all set up and ready to go to get my 7100 PSU back in return and to help you to get your TwinRocketBoosterTitan III/IIci off the launch pad. [] ]'>

Post me your IIci Sheet Metal, the Switching Block . . . never mind . . . make it the whole thing and I'll use it and my 7100 for the guinea pig . . .

. . . instead of my Q700/PSU. }

My IIsi/PSU is the sacrificial Hamster. )

 

[Trash80toHP_Mini]

hey. olePigeon!

I got Dell Model:HP-P2507F3R along with my very first LC delivered by UPS today. [] ]'>

This ATX looks to be a perfect fit for the Q700 Sheet metal, AC-in spec is the same as my ITX at 6A of 100-127V, but it will give you 22A on the +5V Rail . . .

. . . will 10A more than the Q700's Baseline of 12A of +5V be enough enough for liftoff?

. . . post me that pathetic IIci PSU and we'll see! [}] ]'>

 

[olePigeon]

It's wroth a shot. Thanks! PM me your address.