12VDC regulator design question
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12VDC regulator design question

 
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speckone



Joined: 03 May 2006
Posts: 1
Location: AZ
Posted: Wed May 03, 2006 8:51 pm    Post subject: 12VDC regulator design question Reply with quote
I am using a MC7812 with a input voltage of @13.2VDC to power a Hard Drive(I am putting a MP3 player with IDE interface in an '80's ghettoblaster). The 5 volt rail seems okay as it is coming from a self contained power supply that came with the MP3 player. Unfortunately the 12V voltage isn't very steady. When I turn on the MP3 player or the power to the rest of the stereo the voltage drops. When I plug in the hard drive it starts beeping! The hard drive isn't fried. Any suggestions?

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neon



Joined: 25 Feb 2006
Posts: 590
Posted: Fri May 05, 2006 6:02 pm    Post subject: Reply with quote
yah well a 78xx is fine except they like to have something to regulate with and .3v is just not good enough read the specs for min input voltage to regulate that get you the idea
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