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Electronics => Electronics => Topic started by: hendrachubby on June 18, 2009, 03:36:46 AM

Title: Axon Power Supply
Post by: hendrachubby on June 18, 2009, 03:36:46 AM

Can I use 9V battery ?

Title: Re: Axon Power Supply
Post by: SmAsH on June 18, 2009, 06:27:52 AM

*sigh* yes... but bear in mind... if using servos they will receive 9V which is bad for most servos.

Title: Re: Axon Power Supply
Post by: hendrachubby on June 18, 2009, 06:32:59 AM

i'm not using servos...i just use the regulated pin... thx for the info

Title: Re: Axon Power Supply
Post by: SmAsH on June 18, 2009, 06:37:03 AM

ahh ok, then you will be fine, but it is a bit of a waste and the regulator *may* get hot.

Title: Re: Axon Power Supply
Post by: awally88 on June 18, 2009, 08:21:31 AM

If you have something smaller it would be better as there is a 5V regulator on it which will convert 9V -> 5V, the 4V difference is given off as heat which is bad. If you do run off a 9V battery find a heat sink for the regulator and it hopefully won't be too bad.

Title: Re: Axon Power Supply
Post by: hendrachubby on June 18, 2009, 08:33:22 AM

anyone have tried ? how much heat it will produced ?

Title: Re: Axon Power Supply
Post by: Admin on June 18, 2009, 02:22:03 PM

power = voltage drop * current

power = (9V - 5V) * 0.5A (what is your current draw?)

power = 2W of heat

then look at the voltage regulator datasheet to match that with temperature

Title: Re: Axon Power Supply
Post by: hendrachubby on June 20, 2009, 06:37:29 AM

okay i already tried it, with the heatsink, and it works fine...even there the regulator a bit warm