Electronics Question

razerdave · Post by **razerdave** » Sun Dec 17, 2006 9:05 pm

Hi everyone

I'm not the most advanced builder about, but for my rebuild of Ying Yang I require a few electronic components, but I need some help straightening out fact from fiction.

The senario is this: I have a pair of pico servos for drive,a 7.4v lipo for power, and we know these do no go together very well, so I need to drop the voltage from 7.4 to 6 or below. Now, I have been told I can do this either with resistors or LED's. I have also been told if I wire resistors one way around they will drop voltage (Series) and another way will drop current (paralell), but I have also heard it is the other way around, so can someone tell me which is true ? I beleive LED's drop voltage but I wasn't sure if they could take the current, but I think they can take 130mA, but someone might know better than me.

Any help is greatly appreciated
Regards

Cavecrusher · Post by **Cavecrusher** » Wed Dec 20, 2006 7:19 pm

just get a 7806 and a capacitor, will get you 6v just fine

Post by **BeligerAnt** » Wed Dec 20, 2006 9:22 pm

Neither resistors nor LEDs are suitable for dropping the voltage in this case (or almost any case come to think of it!). As Tim says, use a 7806 voltage regulator IC. Add a 100nF (0.1uF) capacitor across the input (and another one across the output) and you have a pretty good solution.

Under heavy load you may not quite get 6V, but you probably won't notice. If you can find a low dropout voltage (LDO) regulator it will work a bit better, but you need to make sure you use the correct capacitors with it (otherwise they make very good oscillators!

)

harveyandpuma · Post by **harveyandpuma** » Sat Dec 30, 2006 11:43 am

hi i just joined and i am waiting for my antweight order to arrive.

i ordered it off robot market place and ive been waiting for about 4 weeks for it to come.

is this because i live in spain if it is how long will it take.

thanks

harvey