Articles, Battery, Circuit, Components, Design, Electronics, Electronics Theory, Hobby Circuits, Home Circuits, How components work, Power Supply, Techniques, Utility Gadgets

Battery Voltage Monitor. Design Note 36

This is the simplest type of Voltage Monitor you can build in 5 minutes. No need for a PCB and just solder lead to lead and hook up in the Emergency lamp. As long as the battery voltage is above 5 volts, LED lights to indicate a healthy battery. When the battery voltage drops below 4.7 volts, LED turns off to indicate the time for charging. It is a must for emergency lamp since deep discharge  permanently destroys the battery. Let us see what is happening in the emergency lamp battery.
Continue reading “Battery Voltage Monitor. Design Note 36”