Epia M working with a Sproggy like PS

**Trottingwolf** · 06-21-2003, 03:54 AM

Hi all,
I just got an epia m9000 motherboard to upgrade my carputer. I have been running it with a sproggy like power supply. What i mean by that is the power supply uses the maxim 788, and 787 regulators but not the t6 transformer. I use a maxim 775 for -12V and a LT1074 regulator for the -5V. For +12 I use a flyback regulator design that came in the form of a power supply for laptops that runs on 8-16V and outputs about 2A.
My question is after search for info about how the sproggys work with the epias I found people have been having problems. I can't tell if anyone has come up with an easy solution to the problem. I know it is a problem with the power-good signal and I have been able to make my power supply work with my epia m board. If fact I am typing this measge on my carputer (inside the house of course) running off the 12V from the ATX powersupply on my home computer.
If the epia M power good problem has not been fixed I would like to offer my help to those people trying to get it to work.
To let you know how I got mine to work, and it may just be luck, but I pluged the power-good line through a 100k resistor (this resistor may not be needed and may not be the right value, but i wanted to make sure i didnt fry anything) into the 5V out on my power supply. When I turned on the power supply with it like this it did not work at first. I found out that the secret in my case is to push the power button on the motherboard then turn on the power supply and then let go of the powerbutton. If this is done quicly it works on my puter and power supply setup. I hope this helps someone with there setup. I will be doing some more work on my power supply and when I get it working well I will give more information and I will try and make up some plans so that others can copy my design if they want. I have had it for about two years now and it works great!

Rock on the Roads Dudes!
Trottingwolf

**doig** · 06-21-2003, 09:47 AM

hey, good work!

just wondering if you could post the design for that one up, and is it going to be possible/feasable to automate this process so that it intergrates well? (ie not trying to hold down button while using foot to kick key from 'off' to 'start'? although i can see myself doing something like that!)

**Trottingwolf** · 06-21-2003, 07:04 PM

Yeah I need to automate this but I just wanted to let you know that it will work. When I finish the design I will make it nice so people can understand it, not my scribbles on a peice of paper, and post it. I should take me a few weeks but I will get it done. I want my mp3 Player back in my truck!
It would help if someone would give me a working link to the sproggy design. My is not a sproggy, but a close design, so I will need to know exacly how they work if I am going to make my fix work for you. I aslo plan to make a shutdown controler but dont hold you breath for that one.

**doig** · 06-21-2003, 09:33 PM

about all i can offer on the sproggy is the circuit diagrams that i have for some of the older ones the 2.5 and 2.6.... if they are of any use and you want them then let me know

looking foward to that design!

**az1324** · 06-21-2003, 09:56 PM

This might be it:

**PTCruiser** · 06-22-2003, 04:04 PM

I use a maxim 775 for -12V and a LT1074 regulator for the -5V

strange...Epia M9000 didn't requier negativ voltage

**Trottingwolf** · 06-22-2003, 06:24 PM

I built the power supply about 2 years ago before I got the Epia board. The one I had back then didnt even need the -5V and -12V I dont think but I felt like putting them in just in case.