Electronics > Electronics
Voltage Regulator...?
Nyx:
I purchased 10 voltage regulators, they are "UA7812KC" 12V 1.5A, and come in a TO-3 casing with two pins coming out. The problem is, I don't know how to use them. I'm guessing the casing acts as the ground.... But which pin is in, and which pin is out?
I tried guessing, but when hooking this to my power supply and measuring the output voltage, I either get the same voltage as the input, or (reversing the pins), no output at all. I can't seem to find a real datasheet for this with a pinout, and a sample circuit on how this is supposed to be used.
Any help would be appreciated....
HDL_CinC_Dragon:
two pins? Only two pins?
A Vreg has 3 pins... if it doesnt then its either not a real vreg or its broken...
The middle of the three pins is ground. Looking at it from the front, left of the GND pin is the input, and right of the GND pin is output.
also: Datasheet
-Hope this helped...
Nyx:
--- Quote from: HDL_CinC_Dragon on August 24, 2007, 02:10:48 PM ---two pins? Only two pins?
A Vreg has 3 pins... if it doesnt then its either not a real vreg or its broken...
The middle of the three pins is ground. Looking at it from the front, left of the GND pin is the input, and right of the GND pin is output.
also: Datasheet
-Hope this helped...
--- End quote ---
That's not the right part, your datasheet is for the UA7812CKC, mine is an UA7812KC... And it comes in a TO-3 package, not TO220. Yes, it does have two pins, and no, it's not broken. The casing is the third "pin".
Nyx:
Is it actually possible that my voltage regulator can't output 12V from input voltages less than 12V?
HDL_CinC_Dragon:
ok then. The casing is ground, im sure you knew that though...
If your looking at it from the front, probably the left pin would be the input, and then right pin should be the output since that is the standard layout for vregs...
try running like 15 volts through it using that setup and measure using your multimeter between that right pin and GND and you should see 12v...
-EDIT-
But make sure you dont exceed 1.5A!
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