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#16
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Re: Charging 7.2V Backup Battery
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#17
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Re: Charging 7.2V Backup Battery
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http://en.wikipedia.org/wiki/Cadmium http://risk.lsd.ornl.gov/tox/profiles/cadmium.shtml http://www.epa.gov/ttn/atw/hlthef/cadmium.html |
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#18
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Re: Charging 7.2V Backup Battery
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A good choice for such a charger circuit would be the MAX 713 which is available from almost everyone, and also comes in a 16-pin DIP package (so you don't have to mess with surface mount stuff). Don Last edited by DonRotolo : 12-01-2006 at 23:27. Reason: <R68> is quite clear |
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#19
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Re: Charging 7.2V Backup Battery
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#20
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Re: Charging 7.2V Backup Battery
After reading through the rules i don't really see anything that would violate them as far as creating a custom charger circuit for the 7.2V battery.
As far as weight goes.... we are talking about a circuit board with some components on it. It shouldn't weigh that much. I just mainly wish i could get the IFI design. That way there would be no worry at all of the inspectors saying "you can't have that". |
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#21
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Re: Charging 7.2V Backup Battery
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Don |
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#23
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Re: Charging 7.2V Backup Battery
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#24
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Re: Charging 7.2V Backup Battery
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#25
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Re: Charging 7.2V Backup Battery
Yeah i realized that after i printed it out. It got added yesterday on 01/12/06. So it wasn't there in the beginning but it got here in time.
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#26
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Re: Charging 7.2V Backup Battery
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#27
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Re: Charging 7.2V Backup Battery
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I agree, the only limiting factor is the big resistor between the main and backup battery. According to my calculations, the regulator is set for 8.26 volts output which at full charge will still attempt to pump about 45 ma into the battery with the controller turned off. With everything up and running, the zener will be turned on at 8.7 volts. Last edited by Al Skierkiewicz : 13-01-2006 at 14:53. |
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#28
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Charging the 7.2 Volt Batteries
We're trying to charge the 7.2 volt backup batteries you use for the control system, and we can't figure out how to do that. We looked through the kit of parts, and it seems that there is a charger for them, but closest thing we could find was a 9v charger. Is that alright to use? Or should we look through the parts again?
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#29
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Re: Charging 7.2V Backup Battery
I also see some weirdness in this circuit, but for anyone that wants to build it, I already put together the list of parts from Mouser. Sorry for the horrid formatting (this is a paste straight from their cart). The Tantalum cap's can probably be substituted for ceramics if you have them laying around or for cost reasons. Here are the part #'s that I chose:
Code:
610-CZ5345B CZ5345B Central Semi Diodes - Zener DO-201 8.7V 5.0W $ 0.520 511-LM317T LM317T ST Voltage Regulators TO-220AB 1.2-37V Adj Positive - RoHS COMPLIANT per producer documentation $ 0.460 625-1N5820 1N5820 Vishay Semiconductor Schottky Rectifiers DO-204AL Vr/20V Io/3A BULK $ 0.290 271-221-RC 271-221-RC Xicon 1/4W 1% Metal Film Resistors 221ohms 1% 50PPM - RoHS/Pb-FREE per producer documentation $ 0.090 271-1.24K-RC 271-1.24K-RC Xicon 1/4W 1% Metal Film Resistors 1.24Kohms 1% 50PPM - RoHS/Pb-FREE per producer documentation $ 0.090 294-43-RC 294-43-RC Xicon 1W 5% Carbon Film Resistors 43ohms 5% - RoHS/Pb-FREE per producer documentation $ 0.140 294-22-RC 294-22-RC Xicon 1W 5% Carbon Film Resistors 22ohms 5% - RoHS/Pb-FREE per producer documentation $ 0.140 80-T350A104K035 T350A104K035AS Kemet Dipped Radial Tantalum Capacitors 35V 0.1uF 10% - RoHS non-compliant/CONTAINS Pb $ 0.300 |
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#30
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Re: Charging the 7.2 Volt Batteries
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