Electronics Help!


Der Maulwurf
Mar 5, 2008
I can't seem to find the schematic of the low fuel light board (adjustable) posted on CF ages ago. Looks like theyr archives have vanished (or search is hosed...again)

Anyway, what I actually need is a circuit that switches when the signal wire sees a 20Ohm resisstance. 20Ohms is less than 1/4 full on my level sender. I need it to operate a warning light. Is there some kind of simple gizmo I can buy? I'm not that good when it comes to sodlerig. I could build something off a schematic using the parts and a protype board but it would be much nicer to get something reliable and sturdy :)