Transmission1

jason wrote:My effort . Still work in progress although in daily use for months now

Fantastic I love it, great work. Looks professional in the case with twin meter reading out. Nice making use of the 5 Volt rail as well.

nicely done !

Well it has arrived. Much smaller in the flesh.

Amazing that this can provide up to 100 Amps although I won't be pressing it that hard!
I've ordered two pairs of 80 A binding posts to provide the output. Think I will press ahead and find a suitable case.

Now to test!

EDIT: Powered up and tested at 12.3 Volts

Have a couple of these, I used a 560 ohm 1/2 watt resistor to jump start them. Articles I've read say a resistor from 330R to 1K so thought I'd go somewhere in the middle. It's only a logic pull up resistor I expect anyway.
Having tested with halogen lamps, I put 300 watts on it, over an hour the fan only spun up a bit past idle. To the touch it was just lightly warm. Then I added lamps up to 500 watts, that got the fan spinning a bit quicker. I couldn't measure current at that level, I've got nothing that goes that high.

I would assume losses in the leads and lamps, but I'm sure it was a way over 400 watts, and not problems, how that would pan out on an amplifier I have no idea. Just don't have a big amp at the moment, measured voltage never dropped under 12 Volts for all the loads I tried, I was impressed with that.
Good luck with your modding there, be interested to see how you find it performs.

@sureshot.. i sent you a pm bud.

does anyone have any large, high cfm server fans they no longer need?

Hello

Thought I would provide some updates on my server PSU conversion.

I've yet to wire anything up together but tested all components and have completed what I consider to be the hard part which is the case build.

I've fitted a pair of 80 Amp terminals to the front of the case and a pair of 30 Amp to the rear. The fan is a 80mm PC fan and I'm intending to run this all of the time for now but will build a thermostat in due course. It's an 18dba fan so whisper quiet.

The V/A module uses induction loop for measuring the current so no shunt required.







Will post again once I've done some more work on this.

looking good drew, nice work

Buick Mackane wrote:looking good drew, nice work

Thanks Jason.

I've now wired up the mains side and tested the psu. Next step is the DC side.

A bit more progress tonight.

Still have rear outputs and fan to connect up.
I've split the output via a two way fused distribution block normally used for in car entertainment power feeds. Feed to rear will have a 30A fuse while front will be set to 60A.





SS9900 connected for current test. Draws 300mA on receive and about 7.4A for about 50 Watts. I can adjust this if required.





Will post final pics when completed.

Professional looking job drew, Good stuff, I hate looking at pics of other peoples projects. Mine look sh1t in comparison, Had it been me the meter would have been lop sided and the terminal would have been out of alignment and the wiring would look like a crows nest

Bet theres money to be made building these up, People are always looking for high current supplies, You could easily double yer cash on ebay,

Whats the noise levels like from it ? in terms of QRM ?

Buick Mackane wrote:Professional looking job drew, Good stuff, I hate looking at pics of other peoples projects. Mine look sh1t in comparison, Had it been me the meter would have been lop sided and the terminal would have been out of alignment and the wiring would look like a crows nest

Bet theres money to be made building these up, People are always looking for high current supplies, You could easily double yer cash on ebay,

Whats the noise levels like from it ? in terms of QRM ?

Once I've completed the build and put it in situ, I'll carry out detailed checks on the bands. However, for the quick check I did last night using my SS9900, there was absolutely no generated QRM on either 10 or 11m.

Final pics of completed power supply.






I've had it running most of the night, supplying between 6A and 20A on various tests. Voltage drop is 0.1v at 20A and supply becomes slightly warm to the touch. At around 13A, the fan loads up a little but noise levels are still negligible.

As for QRM, it's clean as far as I can tell. Tuning about the HF Amateur bands, 11M and some broadcast stations down to LW, I do not detect any noise so a great result.

Quite pleased with how it has turned out. Cost wise, I paid £20 for the supply and another £25 on the case, meter and other bits and bobs. For £45, I have a supply capable of 75A + so it is very inexpensive and above all, the best bit by far was the enjoyment I got from building it.

kilimax wrote: the best bit by far was the enjoyment I got from building it.

Thats what its all about drew, Fancy building me one ? That way you'll have the enjoyment of building it all over again