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Reply-To: "Jeff Stout"
From: "Jeff Stout"
Subject: Re: [Newbie]: Testing a +5V IC regulator
Date: Tue, 12 Nov 2002 20:37:51 -0600
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
You may have also fried your TTL/CMOS chips too.
You didn't say, but what kind of IC's are your using?
Alistair Campbell wrote in message
> I am new to electronics so this is probably a silly question.
> I am building a kit parallel port interface. The power supply to the
> various IC's is via a 78L05 IC which produces 5v from 9v.
> When I test voltage to the supply pins on the IC's they rate at 9v
> when they should rate at 5v (+/-0.5v).
> Tracking this down I get 9v at the output pin for the 5v regualtor. I
> am using a multimeter and checking by connecting one probe to the
> output pin and one probe to the negative rail.
> Does this mean that the IC 5v regulator has failed? Or am I doing my
> testing wrong?
> Any thoughts would be much appreciated.
> Alistair Campbell
> Brisbane, Australia
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