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| Thread ID: 50782 | 2004-11-01 08:50:00 | modem power supply | bpt1 (419) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 286735 | 2004-11-01 08:50:00 | I have a variable power supply for my newly acquired Dynalink 1456VQE modem. I can also reverse the 12 volt output. Should NEG or POS be alligned to TIP on the connector? Why does the modem show AC IN when input voltage is surely DC? Thanks |
bpt1 (419) | ||
| 286736 | 2004-11-01 08:52:00 | if it goes dont worry :D | Prescott (11) | ||
| 286737 | 2004-11-01 09:02:00 | I havn't yet connected it and I don't want to stuff it up. | bpt1 (419) | ||
| 286738 | 2004-11-01 09:06:00 | do you have a manual with it?, was the power supply supplied with the modem, if it was it should be ok,check the manual :D | Prescott (11) | ||
| 286739 | 2004-11-01 09:16:00 | No manuals. | bpt1 (419) | ||
| 286740 | 2004-11-01 09:17:00 | The modem and power supply were second hand. | bpt1 (419) | ||
| 286741 | 2004-11-01 09:19:00 | Did that power supply come with the modem? I imagine not from your description, and possibly you have not tried it yet. The input voltage is not DC. I have the same modem. The power plug pack that came with it specifies 12 AC output. The rectifier must be internal in the modem. And of course with AC there will no neg & pos polarity for the plug connection. Doesn't seem like the plug pack you have will be suitable. Maybe you could try. It could be possible that the internal rectifier would pass through the DC voltage to liven the modem. Probably not ideal. Any advice from PF1ers with power supply experience? |
Bazza (407) | ||
| 286742 | 2004-11-01 09:20:00 | If it says "AC In" then it is AC. If it is AC then the polarity doesn't matter. In fact, the polarity of AC current reverses 50 times per second! (60 in some countries). But then, it doesn't hurt to be careful. HTH George |
george12 (7) | ||
| 286743 | 2004-11-01 09:30:00 | It depends what's inside the modem in the way of power components as to the suitability of a DC plugpack for an AC modem. If it just full-wave rectifies it inside the modem, then input polarity of a DC supply does not matter. If however it has a transformer coupling inside the modem, then the transformer in the modem will be destroyed quite likely (and the modem will not work). The power pack will also likely be destroyed. My advice is get the right power pack. Also if it is say a 12v AC input, that equates to a rectified and filtered 17 volts DC. Quite different to 12 volt DC. |
godfather (25) | ||
| 286744 | 2004-11-01 09:32:00 | So whichever way I set the connector should be fine? I'll just try it and hope. | bpt1 (419) | ||
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