ebay power supply

[Ricardoco]

Ahh now that power supply looks familier to me, is it because that communications company i work for uses them to generate the 50v dial tone you hear every day when you pick up the phone (assuming you are not on cable that is, lol)...


Rick

[irving2008]

Ahh now that power supply looks familier to me, is it because that communications company i work for uses them to generate the 50v dial tone you hear every day when you pick up the phone (assuming you are not on cable that is, lol)...


Rick

Well its a Mineaba supply for telecoms, c 1995/96... no longer manufactured...

[Ricardoco]

Well its a Mineaba supply for telecoms, c 1995/96... no longer manufactured...

I knew it!! and maybe its not manufactured any more but they are still used, remember this comapany still has bakalite fixtures because they believe "if it aint broke dont fix it because the shareholders need the cash), they do replace them with farnell units when they go bang though....lol

[irving2008]

I knew it!! and maybe its not manufactured any more but they are still used, remember this comapany still has bakalite fixtures because they believe "if it aint broke dont fix it because the shareholders need the cash), they do replace them with farnell units when they go bang though....lol

Dont suppose you'd have any documentation on them?

[Ricardoco]

Im not back at work till next week so i will have a look for you then (if there is i will have to send you some scans) although small there is a chance.. :)



Rick

[hmaki]

Im not back at work till next week so i will have a look for you then (if there is i will have to send you some scans) although small there is a chance.. :)



Rick

I finally received my supply.
Now I wait instructions how I can rise supply voltage:)

[Jonathan]

Would it be safe to put a few of these power supplies in parallel? Maybe put small resistors / diodes(?) in to balance the load.
I ask because it's occured to me that these are the right voltage for my big 48V brushless motor/spindle. It claims to take over 100amps but obviously I'll never need anywhere near that amount! I think 3 PSUs in parallel would be plenty.

[ecat]

Would it be safe to put a few of these power supplies in parallel? Maybe put small resistors / diodes(?) in to balance the load.
I ask because it's occured to me that these are the right voltage for my big 48V brushless motor/spindle. It claims to take over 100amps but obviously I'll never need anywhere near that amount! I think 3 PSUs in parallel would be plenty.

In theory, my interpretation of the theory at least, any switch mode PSUs of similar nominal output voltage can be paralleled without the use of resistors or diodes. Since similar is not the same as exact and exact is impossible, initially one PSU will attempt to handle the full load. It will reach its limit and the OP voltage will drop, at this point another PSU will kick in and try raise the output voltage back to what it should be. Ripple may be a problem, especially when the PSU kick in and out, so test the setup and see.

N.B.
When dealing with switch modes, mains voltages or anything else dangerous I recommend wearing safety glasses, safety gloves, standing well back and getting a friend or loved one to throw the switches ;)