Voltage regulator problem

dev/null

Hi

Being a newbie at electronics, I am trying to regulate voltage to a relay, which demands 12V.
I have successfully built a voltage regulator which takes 14.4 and gives 12V out (schematic).

Problem is, when I connect a second voltage soure with common ground (BLUE WIRE) to the regulator, the regulator output drops to 2V!!!

Any suggestions on how to deal with this?



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Don't worry. Be happy

stamptrol

Not to doubt what you're seeing, but there has to be some other electrical connection also happening when you make that single connection to the 7.2 v battery pack.

Can you show us a bit more of the circuits connected to each of those power supplies? Its almost as if your getting the 7.2 onto the pin 1 of the lm317 regulator.

Cheers,

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Tom Sisk

http://www.siskconsult.com
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dev/null

Here is the complete schematic. I am running the relays on 14V now, hope I dont damage them.


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Don't worry. Be happy