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Dirt Bike Brands - Other
Battery Pack/power Supply
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[QUOTE="techman, post: 148493, member: 17388"] Some of the other fellows information may be not quite appropriate, i.e mixing 60 Hz wall a.c. voltage transformations with higher varying frequency bike alternator voltages and assuming 1.5 v per Nicad. Nicads vary from 1.4 v full charge to 1.1 v near dead. Here's your plan. Get a full wave bridge rectifier chip good for about 100 V and 20 amps (lots of safety margin) and connect it to your headlight power. Then connect it to an about 40 volt multi thousands of uF dc capacitor and there's a bit of a dc supply, very unregulated between about 10 v and probably 14 v. Now take this and feed an LM317T regulator chip, adjusted to the voltage you want plus about 0.6 volts because we're going to take the 317 output and go through a silicon diode to feed a dicky little battery pack for your device. The battery pack will not be "charged" since charge voltage is higher than running voltage, but it will act as a filter and will be maintained from dropping in voltage. When the alternator pukes with low voltage, the batteries will keep your device running. When the alternator voltage is up, you run off of the LM317 diode battery chain with a VERY clean dc supply. You can look up the LM317T data sheet on the web at national semiconductor, it's very informative. The batteries would be your most expensive part. You could get AA's or smaller with no need for big capacity since they won't do much. Only caveats: if your radio hogs power on Tx, the 1 amp capacity of the 317 may not be enough. You should test that with an ammeter and then get a higher current rated dc regulator chip instead of the LM317T. You may want to heat sink the 317's as well if you pull any amount of juice towards 1 amp in your GPS etc. If this seems greek to you, you probably shouldn't be trying to make your own stuff and should get a dc-dc adaptor directly intended for yoru radio and your GPS, ie like for a car cigarette lighter socket. Then you might still have to add the bridge rectifier chip and capacitor if your headlight gets AC and your bike has no battery (to give dc to the "cigarette lighter " socket you effedtively would be creating on your bike, to plug the store bought gizmos into). The Nicads may not be fully happy with no raised charge voltage, as lead acids might also not be, so an alternate plan is to rectify your headlight power into a 12V lead acid battery(instead of the capacitor), and then feed the LM317's off that. Then you'll have no voltage droop unitil the lead acid battery really gets discharged (i.e. 9v). warning: don't try to use a Nicad directly as they have charging quirks that could lead to a meltdown of the battery pack. Lead acids get charged this way all day long in cars and bikes and live happily with it. Good luck :) [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Battery Pack/power Supply
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