This kit uses a single AA battery holder into which the user places a battery. LEDs then illuminate to show the remaining capacity of the battery. The circuit uses a quad operational amplifier to provide a reference voltage and comparators to determine which LEDs should go on. This makes it a great kit for studying operational amplifiers.

Testing of the kit can be performed using an adjustable power supply, or with a circuit tester (consisting of an AA battery holder, variable resistor & crocodile clips).

 Note: this kit requires soldering.

Features:

• Displays battery charge level with 4 LEDs.
• Great for showing how operational amplifiers work.

Contents:

• 1 x PP3 Battery Clip Lead (Heavy Duty).
• 1 x 3xAA Battery Cage with Clip.
• 1 x LM324 Quad Op Amp.
• 1 x IC Socket 14 Pin.
• 1 x 1N4001 Diode.
• 4 x Red 5mm Diffused LED - 275mCd.
• 1 x 680Ω Resistor.
• 5 x 220Ω Resistor.
• 4 x 22KΩ Resistor.
• 1 x 100KΩ Resistor.
• 1 x 1xAA Battery Cage with Leads.
• 1 x Battery Tester PCB.

Dimensions:

• PCB Length: 68.5mm.
• PCB Width: 38mm.

Requires:

• 4 x AA Batteries.

Resources:

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This kit is supplied in a simple grip seal bag.