Stepping down voltage from a battery

[Mindcrime13]

Im working on an airsoft replica and the issue im having is that the battery i have is way to powerfull but is the only battery that fits my replica propperly. The battery is lipo 11.1 volts, 1600mah, 20C i need to take the voltage down to at least 8 volts, i know that there is a formula to find what resistor i can use to step down the voltage but i really dont know, so any input , help is appreciated

 

[dmclambjr]

I would suggest getting a bread board and try some experimenting with voltage drops across the resisters and checking out http://www.wikihow.com/Calculate-Series-and-Parallel-Resistance

 

[Razorback64]

Depending on the application, the industry uses one of the following three methods, listed below in the order of increasing power level:

1) A charge pump: lets the potential energy built up in a row of parallel capacitors then switches to connect the capacitors in series to add up the voltage.

2) A boost converter: lets the kinetic energy built up in an inductor then switches to discharge that energy to a capacitor to pump up the capacitor voltage.

3) A transformer: oscillates the DC to an AC, runs the AC through a step up transformer, then rectifies the secondary AC back to a DC.




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[barathbushan]

I would suggest getting a bread board and try some experimenting with voltage drops across the resisters and checking out http://www.wikihow.com/Calculate-Series-and-Parallel-Resistance

you cant use a resistor to drop voltage unless you know that the load current is constant !!
if the load demands more current then there will be a greater drop at the resistor , and this prevents the load from getting the required voltage

 

[barathbushan]

Depending on the application, the industry uses one of the following three methods, listed below in the order of increasing power level:

A transformer: oscillates the DC to an AC, runs the AC through a step up transformer, then rectifies the secondary AC back to a DC.

there is no such thing as a transformer oscillator !!!
if you run dc through a transformer , there is no change in flux , and hence Emf is not
induced , IN SHORT NOTHING HAPPENS

 

[barathbushan]

Th only solution to this problem is to use a dc-dc converter IC as given here

http://www.datasheetdir.com/MAX736+Inverting-Switching-Regulator

chose the appropriate IC for your applications , and refer to its datasheet for the circuit diagrams and design