1.1k
This is a simple circuit that was submitted, the purpose was to check the voltage of a golf cart battery that was not in use did not fall below a certain level, if this occurs then the performance of the battery can fall and eventually a new battery may be required. These can be costly, this simple circuit which costs a very small amount will light a LED if the voltage drops below about 11.5v.
Schematic
Battery Low Voltage Indicator
Parts List
QTY PART-REFS VALUE --- --------- ----- Resistors --------- 1 R1 1k Capacitors ---------- 1 C1 1uF Transistors ----------- 1 Q1 BC557 Diodes ------ 1 D1 10v 1 D2 LED Miscellaneous ------------- 1 BAT1 12v 1 RV1 5k