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| Thread ID: 123127 | 2012-02-05 07:26:00 | SParkies, old P&T techs, anyone brighter than me ... Wiring Up A Bell Ringer | Murray P (44) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 1257525 | 2012-02-05 21:43:00 | Looks just like a bell in its own right and I seem to remember 18v. | mikebartnz (21) | ||
| 1257526 | 2012-02-05 21:44:00 | Cheers B.M. and Dugimodo. I haven't managed to track an old P&T or BT spec or schematic, hence my post here and not that I'm particularly good at interpreting those things ... But from the sounds of it, if I/my electrician patch in to a nearby light circuit with a close-ish power pack/transformer form Jaycar or like, we should be sweet. The fun will be isolating the bell push... unless I go for mechanically isolating the outside push from the inside switch, thinking aloud. |
Murray P (44) | ||
| 1257527 | 2012-02-05 21:46:00 | Looks just like a bell in its own right and I seem to remember 18v. Cat amongst the pigeons, Mike, you may well be right. It does look like a shop/factory type ringer. How would I test it, I have a wee multimeter (once I replace the battery) |
Murray P (44) | ||
| 1257528 | 2012-02-05 22:00:00 | That looks similar to the ringer / doorbell we had at the old flat. It was 8v. The transformer for it was screwed near the main powerboard in the flat Tell me young man, how stealthy are you? |
Murray P (44) | ||
| 1257529 | 2012-02-05 22:03:00 | Ahhh, then you'll need a ringer to drive the bells. HERE (www.kapiticoastmuseum.org) ;) | B.M. (505) | ||
| 1257530 | 2012-02-05 22:47:00 | Quasimodo was a good bell ringer. Didn't need 'wiring up' either. | Richard (739) | ||
| 1257531 | 2012-02-05 23:27:00 | How would I test it, I have a wee multimeter (once I replace the battery) Still learning that type of thing. Have just rewired an old phone charger wall wart and am going to get a guy to test it to make sure I got it right rather than blow a $55 Arduino. |
mikebartnz (21) | ||
| 1257532 | 2012-02-06 00:11:00 | The Ideal thing would be to find someone with a adjustable bench top AC power supply and just crank the voltage up until it starts ringing properly :) I dunno if it will handle 50hz well so the frequency could be the biggest issue, if it does that little hammer will be going back and forth like Quasi on crack. |
dugimodo (138) | ||
| 1257533 | 2012-02-06 00:25:00 | By the way assuming those coils are in series, and I think they will be, that gives you a 1k load so just divide your voltage by 1k to find out the current draw I=V/R simple ohms law, ignoring impedance and such it'll be fairly close. So if you feed it 12V it'll use 12mA and 50V will use 50mA, not a huge amount so fairly safe to experiment with. See if you can find an AC plugpack to try. worst case would be parallel which would make the load 250 ohms and increase the current to 48ma @ 12v and 200mA @ 50V so still not much |
dugimodo (138) | ||
| 1257534 | 2012-02-06 00:58:00 | By the way assuming those coils are in series, and I think they will be, that gives you a 1k load so just divide your voltage by 1k to find out the current draw I=V/R simple ohms law, ignoring impedance and such it'll be fairly close. So if you feed it 12V it'll use 12mA and 50V will use 50mA, not a huge amount so fairly safe to experiment with. See if you can find an AC plugpack to try. worst case would be parallel which would make the load 250 ohms and increase the current to 48ma @ 12v and 200mA @ 50V so still not much Unless I'm misinterpreting the photo attached to the OP, each coil has 500 ohms printed on it? |
Murray P (44) | ||
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