- Tue Jun 24, 2014 2:49 pm
#172195
I want to control a warning light from a one wire alternator. I have a 12 vdc relay that I want to pick when the voltage goes from static ( about 12.6 volts or lower) to high (13.5 or more). The light would be wired from the battery+ and the relay would ground the circuit form the light to be on when the battery voltage is low. When the voltage goes high, the zener would pick the relay causing the light to go out.
I got a cheap 13v zener diode and hooked to the battery in series with a dvom. In one direction, I get a very low voltage(.1 or .2) in the other I see the 12.6.
I suspect that the zener is not accurate enough for my needs.
Does Sparkfun have a more accurate zener?
Thanks from a newbie.
I got a cheap 13v zener diode and hooked to the battery in series with a dvom. In one direction, I get a very low voltage(.1 or .2) in the other I see the 12.6.
I suspect that the zener is not accurate enough for my needs.
Does Sparkfun have a more accurate zener?
Thanks from a newbie.