T&T: Security Monitor

[Peter Bennett]

Wednesday, February 6, 2008, 10:26:05 AM, Trawler336 wrote:


Tac> For any and all reasons, these three options  leave me wondering, "Isn't
Tac> there a better way"?   How might I take a  +12 v line, connect to a breaker or
Tac> switch, calculate a value for a voltage  dropping resistor to plug into the
Tac> monitor.  Is there something available  commercially?  I'm sure there has to be a
Tac> way, but I cannot begin to figure  how.  

A series resistor is not too good for this. as the voltage will vary
with the current drawn by the camera, and with the system voltage.

A better suggestion is to use a voltage regulator - there are three
links on my page at http://vancouver-webpages.com/peter/idx_wire.html
showing suitable circuits.


-- 
Peter Bennett, VE7CEI    Vancouver, B.C., Canada
Ennos 31 "Honeycomb"
GPS and NMEA info: http://vancouver-webpages.com/peter 
Vancouver Power Squadron: http://vancouver.powersquadron.ca