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4 Band, 5 Band and 6 Band Resistor Calculator Tool
Graphical resistor calculator tool.Quickly understand the resistor color code.
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Internaland External PCB Trace calculator tool.
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Battery

Express Battery Tester without Power Supply by 555 Timer

Express Battery Tester without Power Supply

The circuit was designed without the use of a power supply or a moving coil voltmeter to create a quick battery tester which can test 1.5 V to 15 V battery cells with a two-LED display.

Battery Circuit for Backup/Standby Operation

Battery Circuit for Backup/Standby Operation

The circuit was designed to create a spare and reserve power source with the use of batteries  during the absence of power from the mains.

Car Charger for 12V Batteries

Car Charger for 12V Batteries

The circuit has been designed to produce a battery charger for automobiles that are using 12V batteries only.

Charger Circuit for 6V or 12V Car Battery

Charger Circuit for 6V or 12V Car Battery

The circuit has been designed to construct a practical mechanism that can easily and automatically charge batteries rated at 6 V or 12 V used in automobiles.

12V Lead Acid Battery Discharge Indicator

12V Lead Acid Battery Discharge Indicator

The circuit was designed to produce an indication before a 12V lead acid battery would reach the discharged state.

Nickel-Cadmium (NiCd) Battery Charger

Nickel-Cadmium (NiCd) Battery Charger

The circuit diagram shows a regular charger being powered by an AC input source, intended for charging batteries.

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