Question: I have 12 CMOS security cameras that require 6-9VDC/200-250mA each. I
have a power supply with an output of 13.7 VDC/2.7 A. I need to drop
the supply voltage and current and also protect the cameras from
possible power fluctuations. Any recommendations or possible
schematics out there on how to build this power supply? Is there any
web references? Any help would be greatly appreciated
Answer:John Thanks, I had considered this but hoped there may be a way around
this. The prospect of buying and placing 12 wall warts (and two power
strips) is not too inviting. I had considered (1) Placing the power
supply on an UPS (the UPS would be sized to the target duration, 45
Min) and (2) placing an inline fuse to each load to protect the other
cameras should one fail. I've seen some ideas on opposing Zener Diodes
to control fluctuations and a few "one box" commercial applications
for CCTV power but hoped I could do this as a project.
