PC Peripherals Way to supply Uninterruptible power to my modem

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Mephistopheles

Mephistopheles

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I'm utterly frustrated now, it happened thrice today that I was playing an online multiplayer game and my modem got reset whenever I got to a crucial stage :@

I had an APC UPS earlier to which I had connected my modem but unfortunately the UPS went kaput. So, I attached my spare 1kVA stabilizer to it so that it would prevent my modem from resetting due to voltage spikes but it doesn't seem to help.

So, should I buy another UPS for it? If yes, please suggest me one. It will be only used to power my modem, nothing else.
 
stabilizer never works in such situations.would u like to share the rating of your modem.like 5v 1A
 
Rating generally marked on the back of modem.To prevent your modem from shutdown due to fluctuation u have two options:Buy a SMPS adapter or DIY for e.g. ur modem has 12v or 5v 1A rating then use a 4-pin molex and attach a plug to it similar to ur adapter in right polarity(I am personally using this method better than buying a UPS).RED wire is +5v,yellow wire +12v,black wire ground.
 
Don't you have a UPS for your pc ? use a powerstrip and hook up both the modem and pc
 
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if you dont need to charge the battery, then two diodes and a battery are all you need. however, do you know basic electronics :P ?
 
 
Mephistopheles said:
Could anybody else confirm whether these ought to work in my case?
Click to expand...
do u think i am giving fake info?

i am 100% sure a smps based adapter won't let ur modem shutdown due to fluctuation.
 
WAAAIT. I thought you wanted backup. I know what your problem is. The power supply side main smoothing capacitor should have dried up or something similar. Best way to go about this is open it up and replace it (its probably the biggest one) with a cap of equal (or if you have space, higher value). I can confirm that this works(thats a ridiculously oversized cap, but hey, it works :P) . If your modem is out of warranty, take it to an electronics service center and tell them that you power supply capacitor is old, and explain your problem, and ask to replace it with a higher value. (same value might not work , since electrolytics have -50/+200% tolerance). I'd suggest the biggest 25V rated cap you can fit in there, or even leaving it open like the case I've posted.

If you really dont want to do surgery on you modem, then Currently, does your modem use a transformer based or smps based adapter ( is it heavy or light). if its light like a mobile charger, its an smps based unit, and contrary to what vip might say, its best that you use a transformer based adapter with a higher rating than you need, and a big ass capacitor at the output. while smps might handle variations in voltage better, for fluctuations, especially ones in which output drops to zero, like in the case of a bad ups with laggy relays, its best to rely on an old fashioned capacitor. But if you wanna go that way, you'll have to worry about polarity etc.

A capacitor is essentially used to smooth the power output. Think of it as a damper

Reservoir Capacitor - Diodes - Science Lobby

the red line is the output from the capacitor.

vip, I'm not gonna say that you're deliberately giving out fake info, but why do you think smps are better in this situation?
 
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