Mastero MK-4.5 250w 12v DC-DC ATX PSU + SDC

**Mastero** · 06-19-2004, 03:03 PM

Hello Friends.

MK-4.5 is comming soon....

Specification:~

Input

8vdc ~ 30vdc (Can survive a Diesel motor start)

Output

+5vdc @ 12A (max)

+3.3vdc @ 12A (max)

+12vdc @ 10A (max)

+5vstby @ 5A (max)

-5v @ 500MA (max)

-12v @ 500MA (max)

PCB Size: 170mm x 110mm (wont fit standard atx psu case)

Built in shut down controller.

Shall post details soon..

Cheers
Mastero

**rando** · 06-19-2004, 03:48 PM

Sounds interesting. Keep up the good work!

**Quattro** · 06-19-2004, 05:54 PM

250 watts sound impressive. Do you know what the cost might be?

**MatrixPC** · 06-19-2004, 06:36 PM

Dam 250W that is impressive

good work

**Quattro** · 06-27-2004, 04:50 PM

Mastero,
Just wondering if you had any updates on the MK-4.5

**MrPerfectionest** · 06-27-2004, 11:01 PM

Is this gonna be another brute force attempt?

By the time you get to a 400W supply the heatsink will need to be about 1 ft x 1ft

**Mastero** · 06-28-2004, 09:10 AM

Originally Posted by MrPerfectionest

Is this gonna be another brute force attempt?

By the time you get to a 400W supply the heatsink will need to be about 1 ft x 1ft

No there will not be a 400w supply ....

It shall be a while before testing....about a week or two...

Mastero

**Quattro** · 06-28-2004, 02:17 PM

Thanks for the update. I'm just wating to buy a power supply ans a gps receiver before I start the installation.

**owenjh** · 06-28-2004, 02:20 PM

Wow, nice specifications, how is the shutdown controller going to work? will it be PIC based? also, how will this be avaliable? thru a kit or just schematic?
Keep up the good work!

**MatrixPC** · 06-28-2004, 03:19 PM

Mastero, just a suggestion for the next PSU.
Can you add another component to the PSU that can send a pulse to turn on the PC. Right now we depend on the mobo that "Resume on power loss" for turn on. Most mobos have that option but there are some mobos don't have that option.
I found the circuit from the12volt.com that use a relay, cap and resistor for constant to pulse.

- Output of the Sproggy relay connect to Pin 86 on image (relay coil +).
- Ground connect to the cap and resistor then to Pin 85 on image (relay coil -) .
- 2 terminal of the ATX power sw can be connected to pin 87 and 30 on image (SPST-NO) pin of the relay.

I tested that circuit on my mobo and it work very well.