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 Post subject: How can I use LM7812 and LM7912 in a way to obtain +-12VDC?
PostPosted: Fri Oct 13, 2017 2:23 am 
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Joined: Mon Apr 24, 2017 12:04 am
Posts: 3
I want to obtain +-12VDC supply from a 24VDC supply where the total load will driver 100mA max.
I tried using two power supplies but one of them blew up. I need the split supply for excitation voltage.So I decided to make a spit supply from a 24VDC supply. I have some many LM7812, LM7912 or equivalent. I tried the following circuit:
Attachment:
MOm4c.png

But instead of +-12VDC I'm getting the following output:
Attachment:
iwPMW .png

These are the only components I have at the moment.I wonder how can I use them in a way to obtain +-12VDC?


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 Post subject: Re: How can I use LM7812 and LM7912 in a way to obtain +-12V
PostPosted: Fri Oct 13, 2017 6:45 am 
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Joined: Thu Oct 06, 2005 4:36 am
Posts: 6800
Location: Monterey Bay, CA
For voltage regulator apps, you might get a better response over at the Element 14 discussion boards....

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 Post subject: Re: How can I use LM7812 and LM7912 in a way to obtain +-12V
PostPosted: Fri Oct 13, 2017 6:05 pm 
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Joined: Mon Apr 24, 2017 12:04 am
Posts: 3
CA_Steve wrote:
For voltage regulator apps, you might get a better response over at the Element 14 discussion boards....


Ok..Thank you for your suggestion :wink:


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