CS wrote:
I am trying to devise a simple circuit to monitor when a 24v nav lamp
has blown. Found this http://www.gammatron.com.au/datashee...0Datasheet.pdf
but at AU$54 it is pretty pricey. Should not be to difficult to make
up, but I need to know he values of the components. I already have
the switch, LED and a resistor to monitor when lamp is on.
TVMIA.
Put the monitor led in series with the lamp, with two or tree
normal diodes accross the led to limit the voltage/current.
20 ohm resistor in series with the led is a good idea.
The shunt diodes must be able to carry the lamp current.
The read leds need the least voltage.