I suggest also to remove fuse F1 (7805 has internal current limiting at obout 1.5A) and add a transistor (or transistors) to limit the output current. Fuse can blow slower than transistors. The transistor should be PNP and connected: Emiter to positive end of R4 (Input line), Base through three 100om resistors to each emiter of Q1-Q3 (or use therr transistors, one for each Q1-Q3), Collector to input of 7805. Transistor should be capable to carry 2A of current at some 2-3V voltage drop. Fuse can be placed at the input of regulator. The one at the output significantly degrades regulation.
Wojciech Kazubski > Hi guys, > > I have this schematic I built with geda and have some question. It is > at: http://64.124.13.3/PIC_Projects/5vdc_PS.html. My questions are: > > 1) Way do the network connections on the ground line show as squares? > 2) Way can't I connect the bottom of the battery to the network? > 3) Can anyone explain how this type of circuit work? I included the > URL for the information source. I don't know how the LM7805 can > control the TIP2955s? > > Thanks for your time. > > -- > William Estrada > [EMAIL PROTECTED] > Mt-Umunhum-Wireless.net ( 64.124.13.3 ) > > > > _______________________________________________ > geda-user mailing list > [email protected] > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
