---------------------------------------------------------- Lightning-List Digest Archive --- Total Messages Posted Thu 06/15/17: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 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) ________________________________ Message 1 _____________________________________ Time: 02:01:35 AM PST US Subject: Lightning-List: Why does L7805CV reach =?ISO-8859-1?Q?80=C2=B0C?= while the resistor reach 40-=?ISO-8859-1?Q?50=C2? From: "Chuoi" 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 Attachments: http://forums.matronics.com//files/qyqzk_975.png ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message lightning-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Lightning-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/lightning-list Browse Digests http://www.matronics.com/digest/lightning-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.