EEWeb

Tools

	4 Band, 5 Band and 6 Band Resistor Calculator Tool Graphical resistor calculator tool.Quickly understand the resistor color code.
	PCB Trace Width Calculator Internaland External PCB Trace calculator tool.
	Wire Self Inductance Calculator Wire, Parallel Wire, Coax, Wire over Plane, Loop, Rectangle Loop, Coil, Broadside Trace, and Edge Coupled Traces

Battery

Li-On Battery Charger via USB

A USB port is a great power source for charging a single cell li-on battery. It is capable of supplying maximum 5.25V and 500 mA.

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Economic Battery Sufficiency Tester by BC547

Battery level indicators generally detect the voltage levels of the batteries to give a result. So, tester circuits must not be a heavy load during the measurement process.

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