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From: "Filippo Salamone"
Subject: Re: Transistor switch
Date: Mon, 30 Sep 2002 15:03:55 +0100
Organization: Tiscali Spa
NNTP-Posting-Date: 30 Sep 2002 13:05:42 GMT
X-Newsreader: Microsoft Outlook Express 5.50.4133.2400
are you shure that 5v- and 110v- are on the same potential?
I made similar circuits but I don't like to mix high (110) and low(5)
So I place always a photo-coupler. It free you from every problem and the
cost is very low.
"Robin Leblond" ha scritto nel messaggio
> I try to build a switch circuit to control a 110 volt (DC) by a 5v (DC).
> Both current (5v and 110v) are from the same source.
> So i use a normal npn transitor in this maner :
> N-----Lampe----- 110v+
> 5v+ --R---P
> 5v- ------N--------------- 110v-
> R is 3.3k and my transistor is a 100x but when i plug it the breaker goes
> What's wrong with this ?
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