Model Boat Mayhem
Technical, Techniques, Hints, and Tips => The "Black Arts!" ( Electrics & Electronics ) => Topic started by: Bernhard on September 30, 2011, 08:32:04 am
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i will like to have to Lipo 7.4 in series... to give 14.8v....bot...i have a sound mondule and a waterpump...there only use 7,4 volt...and i don't have eny more space fore a extra battery,,,what can i do,,,can i take the power from 1 off the battery?...or what else to do......?
Thanks
Regards Bernhard
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I'm afraid you're going to have to use smaller batteries, unevenly draining li-po's in series is generally not a good idea.
Andy :-)
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Look into voltage regulators, Bernhard.
I'm certain there's a solution for you which would allow you to tap into the full voltage and output the voltage you need. Are you handy with a soldering iron?
Andy
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Both sound module and water pump will probably work to a range of voltages - it should be possible to get and fit a voltage regulator to derive the required voltage from the full supply, depending on the requirements of the extras you intend to power. If they need a lot of current (more than 1A in this context dropping 7 volts is a lot), using three smaller batteries may well be the only way to do it, two in series for drive, the other for the auxiliaries. Like Andy says, uneven discharging is a bad idea.
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Thanks......ok.......... i have to stay with the 2...and try to get a small battery to the sound-and pump. this is the pump
ated voltage: 6V DC
Rated current: 0.23A
Capacity: 2.2L/Min (35GPH)
Pump head: 0.6M
Noise: <=35dBA/10cm
Working temperature: -35C ~ +80C
Service life: 26000 hours up
Motor: DC brushless motor
Pump: Centrifugal pump
Weight: 130g (4.6 oz)
Size: 59 x 41 x 33mm (2.3 x 1.6 x 1.3 inch)
Cable length: 280mm (11.0 inch)
Regards Bernhard
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A BEC is your best answer there are many different types that will convert 14.8 down to 6 volts, will the sound module run on 6 volts? as most BEC are 5 or 6 volt output.
An example of the many out there
http://www.hobbyking.com/hobbyking/store/__3735__HXT_UBEC_5_6v_output_5_5_23v_Input.html (http://www.hobbyking.com/hobbyking/store/__3735__HXT_UBEC_5_6v_output_5_5_23v_Input.html)
The lead you have pictures in your first post is a parallel lead not a series lead ;)
Nick
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How god are you at electronics and a soldering iron ?
http://www.hobbyprojects.com/dc_theory/series_parallel_batteries.html
http://www.discovercircuits.com/DJ-Circuits/9vto4v.htm
The foirst is a usefull explanation of batteries in series and parallel... the next one is a circuit diagram of how to halve a voltage drop over a circuit put 14v in and you get 7v out...
Or you could just buy one from maplins
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Great Many Thanks
Bernhard