You're all correct on this.  It is mind boggling all the things that =
have to be considered when making cool stuff. (-:

-----Original Message-----
From: pic microcontroller discussion list =
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Peter L. Peres
Sent: Saturday, June 05, 2004 9:48
To: PICLIST@MITVMA.MIT.EDU
Subject: [PIC:] First Project Finished! But... it used up all my bat =
tree

Your problem is the LEDs and the 7805. You try to run 20 leds showing =
time
which means 10 leds on the average on all the time. So you draw 10*20mA =
=3D
200mA from the po' little 9V battery. It should last only about three
hours like that. Go and buy a $5 wall wart rated same (9V 500mA) and it
will be better. You can still use the battery to provide backup when the
power goes out. The list will likely help you with this (ask).

Peter

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