Mastero MK-4.5 250w 12v DC-DC ATX PSU + SDC - Page 10

MatrixPC · 03-02-2005, 01:58 AM

If you go 64bit for carputer, it better off to use inverter.

Kostas GOLF V · 03-05-2005, 10:05 AM

i have some more questions...

1)is it posible to make the psu without delay???
2)i saw that there are inductors that suport diferent Mhz... is there any deference for the psu?
3)which is the use of that 3 small pots exactly?

thx for your help

Kostas GOLF V · 03-07-2005, 04:27 PM

hey! is there any body that can answer me? :-(

MatrixPC · 03-07-2005, 09:16 PM

Quote: Originally Posted by Kostas GOLF V

i have some more questions...

1)is it posible to make the psu without delay???

I am not sure what are you prefer to.

Quote:

2)i saw that there are inductors that suport diferent Mhz... is there any deference for the psu?

I am not sure about the Mhz, but those are rated at 5A atleast. Take a look at the Maxim datasheet. They are either 47Uh or 10 Uh

Quote:

3)which is the use of that 3 small pots exactly?

Those are to adjust the delay time for the Shutdown controller.

Quote:

thx for your help

Hope Mastero will answer you more.

Mastero · 03-08-2005, 01:54 PM

Which delay are you talking about ...? GLOF

Mastero

047025n · 03-10-2005, 01:46 PM

Hello,

on the national semiconductor http://www.national.com/pf/LM/LM7805C.html
it says that the 7805 has been discontinued?
What should i replace it with if someone could give me an exact product number it would be appreicated.

XBoy · 03-10-2005, 03:00 PM

Is this out?

MatrixPC · 03-10-2005, 05:29 PM

Quote: Originally Posted by 047025n

Hello,

on the national semiconductor http://www.national.com/pf/LM/LM7805C.html
it says that the 7805 has been discontinued?
What should i replace it with if someone could give me an exact product number it would be appreicated.

7805 is a 5V linear regulator. You can get it from anywhere (Electronic parts store of course).

MatrixPC · 03-10-2005, 05:30 PM

Quote: Originally Posted by XBoy

Is this out?

What is out?
If you are talking about the PSU, PM or email Mastero or look up the info on his website (look at his signature) and build yourself one.

Kostas GOLF V · 03-10-2005, 06:16 PM

Quote:

Which delay are you talking about ...? GLOF

i was talking about the time that gives you to start the engine before it turns on...
but if i got it right it's adjustable, from one of the pots, isn't it???

and one more thing, did you find a 12V relay for more Amps? or we should use a 16A?
thank you mastero

btw, my name is Kostas and i have a VW GOLF not a GLOF

sorry for my bad english...

047025n · 03-14-2005, 12:23 PM

Hello,

I'm fairly new to the world of DIY power supplies as well as electronics building. I don't know if this is a stupid question or not but the 10NF ceramic capacitor how many volts should it be?

Thanks

MatrixPC · 03-14-2005, 03:08 PM

Quote: Originally Posted by Kostas GOLF V

i was talking about the time that gives you to start the engine before it turns on...
but if i got it right it's adjustable, from one of the pots, isn't it???

and one more thing, did you find a 12V relay for more Amps? or we should use a 16A?
thank you mastero

btw, my name is Kostas and i have a VW GOLF not a GLOF

sorry for my bad english...

The PSU is ON at the moment you turn your key on (apply power). There is NO start up delay. Those 3 pots are for the SDC circuit (delay shutdown, power pulse duration, and delay cut off)

That relay is fine but I think the PSU is drawing more amp than the relay rated. I am going to use automobile relay but thru testing, the mobo can't turn the relay. I have to use a small relay to turn on that big automobile relay.

MatrixPC · 03-14-2005, 03:13 PM

Quote: Originally Posted by 047025n

Hello,

I'm fairly new to the world of DIY power supplies as well as electronics building. I don't know if this is a stupid question or not but the 10NF ceramic capacitor how many volts should it be?

Thanks

The one I order at digikey is really BIG (about the size of a dime). The one Mastero use is very small. I went to local Fry electronic and bought 4 about the same size. Instead of nF, the packaging is reading in pico Farad . They have both 50V and 100V. I took the 100V instead.
I dought that the car electricall system can get to that voltage, but you never know.

047025n · 03-14-2005, 03:37 PM

ok thanks

You would not happen to have a shipping manifest for the items you ordered through digikey for this project? That would be a big help

MatrixPC · 03-15-2005, 11:04 AM

If I digging around, I will find it. But the problem is my PSU is NOT the same as the one design here cuz I mod to my needs and my order is for 1(1/2) PSU and some other junks.