Lightning-List Digest Archive
Thu 06/15/17 |
Total Messages Posted: 1 |
Today's Message Index:
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1. 02:01 AM - Why does L7805CV reach =?ISO-8859-1?Q?80=C2=B0C?= while the resistor reach 40-=?ISO-8859-1?Q?50=C2? (Chuoi)
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Time: 02:01:35 AM PST US
Subject: Why does L7805CV reach =?ISO-8859-1?Q?80=C2=B0C?= while
the resistor reach 40-=?ISO-8859-1?Q?50=C2?
From: "Chuoi" <xiao46260@gmail.com>
I have made a circuit that is meant to control 12V LED Strips using a WS2803 Chip. The problem I am having is that the L7805CV regulator(datasheet: http://www.kynix.com/uploadfiles/pdf0125/L7805CV.pdf ) reaches 80C while the 1k resistor bank reaches 40-50C.
Because of the nature of the WS2803 chip being a current sink this is the only
combination of parts I could find that would work to switch LED Strips.
The circuit: each channel has a 1k pull up that has a transistor connected to it,
that transistor feeds a 390ohm pullup that goes to a final transistor that
works with the LED Strips. All pullups go to a 5V line provided by the regulator
from 12V.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=470142#470142
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http://forums.matronics.com//files/qyqzk_975.png
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