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DIY DC Voltage-Monitoring Device for Monitoring Your 12V Battery
Want to have a tool-kit that easily monitor your 12V battery? Below we provide you with DIY electronic equipment 
about making a DC voltage-monitoring that allows you to connect 5-14V and get up to 8 levels voltage-monitoring via LEDs light. You can mount it maybe on your car, tractor, or boat dashboard.
You will need these semiconductors to fulfill this purpose: 2pcs LM324, 20pcs of resistors from various Ohms, 8pcs red, yellow,green small/large LEDs, a trimmer, 2pcs 1N4148 diode, 2pcs Zener Diode for each 1N4733 and 1N4737, a connector 2P terminal block and a PCB. This DC voltage-monitoring device provides an early warning of your battery conditions such flat batteries or other embarassing incidents on your car, tractor or boats.
