Re: LM7812 semiconductor has zero volts in but still measures 12.12 volts out?
From: Artur Butryn (akaja_usunto_at_poczta.onet.pl)
Date: 06/09/04
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Date: Wed, 9 Jun 2004 13:10:12 +0200
Uzytkownik "AliTonto" <alitonto@hotmail.com> napisal w wiadomosci
news:6655e407.0406072003.23145c21@posting.google.com...
> This LM7812 is in a TV power supply without any raster or sound.
> When I power on and test the voltage input at pin 1 I measure no
> voltage there but on checking pin 2 (output) I get 12.12volts.
> My question is: how can that be? where is the voltage coming from when
> the input is not there?
> Thanks to anyone who might be able to eplain this one.
> AliT
Where do you get the ground from for your multimeter?
Try checking the voltage between pins 1-2 (this is the input voltage)
and pins 2-3 (output voltage)
Greetz
Artur
.
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