yourwins Posted May 28, 2004 Report Share Posted May 28, 2004 How to measure KA7812 to know whether it good or bad by using Multimeter ?Thank You! Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 28, 2004 Report Share Posted May 28, 2004 Yourwins,The 7812 is a 12V regulator with many transistors and resistors inside. A multimeter cannot measure if it regulates properly, but can tell only if it is shorted. I don't think that it can measure the difference of one that is blown open.The best way to test it is when it is functioning with a proper input voltage and load. Quote Link to comment Share on other sites More sharing options...
MP Posted May 28, 2004 Report Share Posted May 28, 2004 ...however, if your multimeter shows a short between any of the pins, you can stop there and know that the device is bad. In this case, you would have a bad result by testing the circuit with power applied.MP Quote Link to comment Share on other sites More sharing options...
Guest Kasamiko Posted May 28, 2004 Report Share Posted May 28, 2004 I do a quick and dirty check by applying about 15vdc at the input and monitoring the output pin for 12vdc.. ;DBut without a load sometimes will give a false reading that drop when a load is connected.. Quote Link to comment Share on other sites More sharing options...
hotwaterwizard Posted May 28, 2004 Report Share Posted May 28, 2004 Or you can just Pull it out and Make a simple test circuit like they have in the datasheet.KA7812.pdf Quote Link to comment Share on other sites More sharing options...
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