Re: gEDA-user: round dots and square dots

[Wojciech Kazubski <wk0@o2.pl>]

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
> MrUmunhum@popdial.com
> Mt-Umunhum-Wireless.net ( 64.124.13.3 )
> 
> 
> 
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> geda-user@moria.seul.org
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