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Old 27th September 2011, 01:32 PM   #1
diyAudio Member
Join Date: Sep 2006
Default Regulator Question..

On the circuit board its marked L7812 L7812A..

The middle pads are connected directly to the caps negative terminal..

When i looked at the regulators they are marked 7912 but appear to have been switched from the orginals..

My question is Should the be 7812's that belong in this amp not the 7912's ?

And also wondering since the middle leg connects to the caps ground is there no possible way that they can be the 7912's that go there?
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Old 27th September 2011, 01:45 PM   #2
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Join Date: Sep 2008
Location: Near Seattle Wa
7812 is the positive version. Installing a 7912 in that spot would require reversing cap, cutting and hacking, and gettin a negative voltage from somewhere. This is really not likely. Yes the middle leg on the 7812 is grounded, and common to the tab. I would be cautious here, if you haven't turned this thing on, better find out what was done before applying power. Good Luck.
"You can keep your insurance baby nothing is guaranteed" -Tom Petty
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Old 27th September 2011, 01:55 PM   #3
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Join Date: Sep 2006

The in leg for both regulators connect to 100uf 63 volts caps positive terminal..

middle legs connect to the caps negative terminal..

3rd leg connects to the caps positive terminal..

So the 7812's should be the correct part??
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Old 27th September 2011, 02:18 PM   #4
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Join Date: Nov 2003
Location: Louisiana
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