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12 volt photo cell?

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Silver - Posts: 523
Silver spacespace
Joined: August 25, 2002
Location: United States
Posted: February 18, 2008 at 9:08 PM / IP Logged  
I am trying to find a photo cell that will work with 12 volts. I know that they make them because most of the vehicles with auto headlights have one one the dash or somewhere to turn on the headlights. If anyone has run across them on the net or anywhere I would like to know where you saw them. Thanks in advance.   Brian
Platinum - Posts: 3,539
Platinum spaceThis member consistently provides reliable informationspace
Joined: April 14, 2005
Location: Ohio, United States
Posted: February 19, 2008 at 9:08 AM / IP Logged  
You can get photoresistors at Radioshack.  Use the photoresistor inline with another reisotor to form a voltage divider and feed an op amp with it.  Put a pot on the other op amp input to set your switch threshold and you'll have a fully working photocell.
Kevin Pierson
Copper - Posts: 140
Copper spacespace
Joined: July 09, 2002
Location: United States
Posted: February 24, 2008 at 5:10 PM / IP Logged  
The photocell in my Trailblazer only has 5v running through it.
john ortega 
Member - Posts: 5
Member spacespace
Joined: February 24, 2008
Location: Texas, United States
Posted: February 24, 2008 at 10:05 PM / IP Logged  
hey whats up iam john iam new here you might check out this company called velleman they have a ton of stuff you might want to contact viper i use to have a old 900 a while back and it had a cell.late.
john ortega

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