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Many individuals assume that spark gap Tesla coils require high voltages, typically ranging from 4 kV to 15 kV or more. However, some interesting experiments can be conducted using as little as 240 V directly. Aside from very low...
This circuit diagram indicates when the input voltage deviates from two defined limits, V1 and V2. The limits are adjustable, and the circuit is designed to trigger the adjustable window. The supply voltage, Vcc, must be at least 2...
This battery allows the indicator to the car battery voltage monitor. The indicator has four LEDs which indicate power. The more LEDs, the higher the voltage. The last LED is a flashing LED. It comes on when the accuspaning...
Designing a Li-Ion Battery Charger with Load Sharing MCP73837. Batteries frequently serve as the primary energy source for portable electronic devices. Although these devices rely on batteries, portable consumer electronics such as GPS devices and multimedia players often draw...
This design is based on one published by Milan Lulic in the German magazine elektroModell. Mr. Lulic's design is for surface mount technology (SMT) construction, whereas mine uses standard off-the-shelf components, and is therefore better suited to construction by...
An emergency light is a light source designed to be available during emergencies. It operates automatically and is powered by a rechargeable battery. An emergency light system typically consists of several key components: a light source, a rechargeable battery, a...
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