28 Dec
2005
28 Dec
'05
2:13 a.m.
Allison wrote:
I'm ready to begin the power-up process with this Cromemco Z-2D. The
cards all look good, the backplane and cabling all look intact, and the
PSU itself looks clean and shows no scorching or other damage. Oh, and
I've cobbled up a power cable for it. ;)
I understand the principle of using a light as a current limiter, but
I have one question - say I start with a 7.5W bulb, how long should I
run the PSU at that level, and should I then step up through 20W, 40W,
etc? If so, I have bulbs up to 200W; where should I stop?
Doc
>
>S100 linear supplies are unregulated (usually) before they get on the bus
>so a load is NOT needed. Do insure the caps are discharged before
>inserting
>any board.
>
>Allison
Anything under a 20W appliance bulb initially. The lower the wattage the
higher will be the initial resistance and lower peak current.