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Filtered Linear Power Supply

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By Nicola

March 2, 2009
Nicola's picture

I was wondering on a site about wireless video transmission, and ended up on this power supply board:

http://www.rangevideo.com/index.php?main_page=product_info&cPath=7_20&products_id=161&zenid=32f8d15754cc1b8054ef3d5a800f706a

Isn't it very very interesting?? 10 bucks and you have a selectable 3.3, 5, 12 output voltage with input between 4 and 35 volts!

Is there something i'm missing or is it very cool?

‹ Where is all this noise coming from? PING giving false readings ›

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By OddBot
@ Mon, 2009-03-02 16:06
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To be cool it needs to have the efficency of a switchmode. It also seems to be limited on current output. If you want to run a heap of servos off of it then it needs to be able to handle at least 2A
By Nicola
@ Mon, 2009-03-02 16:26
Nicola's picture

no, i'd like to just run a wireless transmitter for the camera.

the problem is that my battery 12V delivers about 14-10,when fully charged or very discharged, but the wireless transmitter wants 12V +/- 10%, so between 12.12V and 11.88V (if i'm not missing something).

Is there any other way to ouput some clean 12 V off that battery ?

By robologist
@ Mon, 2009-03-02 18:13
robologist's picture

Probably not, but does your camera really need such a tight supply? Most electronic devices are designed with a little more leeway in them.Particularly if they are designed for battery (DC) operation.

 

By Nicola
@ Tue, 2009-03-03 15:16
Nicola's picture

uhm wait, 10% of 12 is 1.2, not 0.12, so +/-10% is 13.2 / 10.8

sorry :P i should learn some math first!

By Nicola
@ Tue, 2009-03-03 10:11
Nicola's picture

that's what she said (the specs) :P

 

http://www.rangevideo.com/index.php?main_page=product_info&cPath=35_21&products_id=138

By OddBot
@ Tue, 2009-03-03 10:22
OddBot's picture
Your probably better of using a low dropout variable voltage regulator set for 11V. That will give you a stable output until the battery goes below 11.5V
By robologist
@ Mon, 2009-03-02 15:53
robologist's picture
It's still a linear supply, the excess voltage is burned off, making it less efficient than a switching supply. It's not a bad set-up, and has a wider input than a 7805 though. If you're using the higher voltage supply it might be somewhat helpful.