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Two Transistors Lead Acid Battery Monitor (BC557)

2015-01-22 18:56  
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This article describes the Two Transistors Lead Acid Battery Monitor (BC557). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: BC557.

The circuit of battery monitor below uses 3 separate LEDs. Voltage level between 6v to below 11v will turn the red LED on and will turn off above 11v. Between 11v and 13v will turn the orange LED on and will turn off above 13v. The green LED illuminates above 13v.
Two Transistors Lead Acid Battery Monitor circuit schematic diagram

[Source: talkinglelectronics.com]


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