Decrease voltage but keeping current

RE: Decrease voltage but keeping current

benjaminpeere — Mon, 12 Nov 2018 15:38:29 GMT

Oh ok, thank you very much for your answer!

RE: Decrease voltage but keeping current

haakonsh — Mon, 12 Nov 2018 15:36:55 GMT

Ahh I did not catch that, yeah that's an LDO. However I suggest you use a variable instead of fixed voltage LDO as they are better at filtering noise.

RE: Decrease voltage but keeping current

benjaminpeere — Mon, 12 Nov 2018 15:31:05 GMT

4 AAA batteries produce 1.8Amp of current, which is perfect for my motor, I know that I have to step down my voltage, I Don't know what is LDO, is it preferable to use it instead of the voltage regulator that I showed in my previous post?

RE: Decrease voltage but keeping current

haakonsh — Mon, 12 Nov 2018 15:11:06 GMT

I do not know how much current four AAA batteries in series can deliver. You'll find that information in the AAA battery's datasheet.

You need a constant voltage source for the nRF51 and the stepper motor will create a lot of noise on the supply of the nRF51, therefore you can not use the output of two of you AAA in series, half of your AAA stack. This means that you need to step down the voltage from 6V to the operating voltage of the nRF51, prefferably with an LDO due to the noisy supply.