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Adding More Batteries | 14 comments (14 topical, editorial)

Re: Adding More Batteries (3.00 / 0) (#8)
by dnix71 (yahoo.com 'dnix71') on Wed Aug 20th, 2008 at 03:08:49 PM MST
(User Info)

I opened the modem (an ATM, really). Westell C90-610030-06, Rev H

It has a full wave bridge just above the big round cap on the upper left. I plugged it into 13.2 volts dc from the Harbor Freight pdu and it seems to work fine.

I'm posting using it now. If I get desperate for power, I'll do it that way. What does 10.5 vac work out to full wave rectified? Is 13 dc underpowered?

[ Parent ]

Re: Adding More Batteries (3.00 / 0) (#9)
by Ungrounded Lightning Rod on Wed Aug 20th, 2008 at 03:57:18 PM MST
(User Info)

What does 10.5 vac work out to full wave rectified?

10.5 * 1.414 = 14.8470

But there's also "droop" due to current pulled from the cap between the peaks. DC doesn't droop.

There will be a regulator or two downstream to reduce the voltage to what is actually used. So you're probably just fine.

[ Parent ]

Adding More Batteries | 14 comments (14 topical, 0 editorial)

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