I am working on a project involving the dimming circuit on an automobile and LED's. The battery voltage feeding the dimming circuit ranges anywhere from 12.9vdc up to as high as 19.2vdc and then is variable all the way down to 0vdc. Is there any basic component or simple circuit I can use that would cap that voltage between 12 and 14 volts but still allow the bottom end of the range to be 0vdc? My problem is that my 12v LED's are burning out easily when the voltage peaks in the 15v and higher range. I tried using a LC7812 voltage regulator but it is all or nothing when the circuit gets dimmed.
Any suggestions are welcomed and appreciated.
Any suggestions are welcomed and appreciated.