I know this is a dumb question but I just want to know if the thing works before I spend money to buy the proper transformer. I really want to know if there is any leeway up or down when it comes to this subject. (for future reference) Thanks a bunch.
2006-12-11 11:57:19 · 9 answers · asked by techengr36 2 in Science & Mathematics ➔ Engineering
It may be OK or not, depending on the internal power supply circuit of the modem.
I would try with a 9V, 1.5A transformer. You will be safe, and since most electronic devices will still operate with 15% less input voltage, it should work most of the time (unless there is any problem with energy supply to your home and you have less than, say 105V at your outlet).
2006-12-11 14:05:12 · answer #1 · answered by Eng_helper 2 · 0⤊ 0⤋
Is the transformer DC or AC out? This is important because if it's DC out, the modem probably isn't very forgiving since the transformer is essentually the power supply for the circuits inside the modem. If the original is regulated, don't substitute it with anything but one with the same specs.
However, if it's AC out of the transformer, the modem will have an internal power supply which will be much more forgiving of a slight voltage difference (which will occur natually on an unregulated AC transformer porportional to the load and input variations).
If you check the open circuit voltage on most step down transformers, they usually will measure much higher than the published rating - as high as 16 to 18 VAC on a 12.5 VAC rated transformer. This is because the voltage will read much closer to the specification when it is connected through a rectifier bridge.
Most of the small AC to DC step down power supply transformers are not regulated and the manufacturer will chose one that gives the approximate voltage they need with the average load of the device.
In answer to your particular question, a 20% increase (10V-12V) is in excess of the varience of most of the components in the circuit (+-10%) and I wouldn't recommend it.
2006-12-11 14:12:49 · answer #2 · answered by LeAnne 7 · 0⤊ 0⤋
It might possibly work but you would be risking several ways of destroying your cable modem. The amp rating is fine as the transformer you have is greater capacity than the desired one.
Voltage is the problem. There is an ever-so-slight chance the cable modem manufacturer chose a 10V transformer because it had a hundred thousand of them on the shelf but could have chosen the 12V one instead. EVER-so-slight. More likely, the modem will be damaged by the higher voltage, both because some components will be zapped by the higher voltage and because the added heat might fry them.
Even if you try them and everything seems to work fine, you will almost certainly degrade the components until they finally fail. A day, a month, who knows but it will very likely happen.
2006-12-11 13:35:45 · answer #3 · answered by roynburton 5 · 0⤊ 0⤋
The problem is the 12V on the 10V device.
You could divide the voltage across a set of resistors that were sized to give you the 10V. But you could get a PS for that trouble and be done with it.
It might just work if it was a 10V PS on a 12V device.
Yes, there is some tolerance on incoming voltage, but the conservative view is that you don't want to over-volt (system impedance or resistance is set up for the lower voltage; at higher voltage, you will tend to push excess current - which means heat - which means failure).
2006-12-11 12:09:04 · answer #4 · answered by www.HaysEngineering.com 4 · 0⤊ 0⤋
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2016-05-23 07:07:52 · answer #5 · answered by Anonymous · 0⤊ 0⤋
probably not, that 2 volts could possibly shorten the life of the modem or burn it out right away depending on the spects of the modem, the amps would not matter as the modem will only use what it needs.
2006-12-11 12:08:19 · answer #6 · answered by biged 3 · 0⤊ 0⤋
No. The higher voltage can blow out the components
2006-12-11 13:46:12 · answer #7 · answered by scubamasterme 3 · 0⤊ 0⤋
12V 1.5A = 18watts
10V 1.2A = 12watts
2006-12-11 13:07:52 · answer #8 · answered by Anonymous · 0⤊ 0⤋
probably would be ok..... might not work as well as it could.
would probably get hotter is all
2006-12-11 12:09:36 · answer #9 · answered by adam_adams_25 3 · 1⤊ 0⤋