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LED Flashlight Circuit using 1.5 V Cell

Last Updated on January 2, 2024 by Swagatam 5 Comments

luxeon star 3.3 V LED

This LED flashlight circuit is able to power a Luxeon type LED with a single 1.5 V battery. This results in a miniature flashlight that will not run out quickly. By: P. Martin Basically it is a boost converter circuit which boosts the 1.5 V DC from a AAA cell and converts it into a […]

Filed Under: Lamps and Lights Tagged With: Cell, Flashlight, LED

Gel Cell Battery Charger Circuit [Constant Current, Constant Voltage]

Last Updated on November 22, 2023 by Swagatam 42 Comments

Fig 1

In this post I have explained what are gel cell batteries and also learn how to build a specialized charger for charging a gel cell battery, with full calculations. The proposed circuit works in two modes: it starts charging a discharged gel cell battery with constant current, until the full charge voltage is reached across […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Cell, Charger, Constant, Current, Voltage

How to Make Dye-Sensitized Solar Cell or Solar Cell from Fruit Tea

Last Updated on January 23, 2024 by Swagatam 2 Comments

conductive glass 1

The innovation of dye-sensitized solar cells has expanded the device’s potential up to the point where it might completely oust costly silicon solar cells. In the following post I have explained how you can easily construct this versatile dye-sensitized solar cell using very ordinary materials. This experiment relies on the concept of utilizing the organic […]

Filed Under: Solar Controller Circuits Tagged With: Cell, Fruit, Sensitized, Solar

Series 2S, 5S Li-Ion Cell Charger using BQ7718

Last Updated on September 30, 2020 by Swagatam Leave a Comment

multi cell li ion volatge controller

This BQ7718 series 2S to 5S series Li-Ion cell charger is designed to monitor the voltage of each of the li-ion cells independently, with reference to an internally set reference level. As soon as any of the cell voltage tends to go above the reference level, it triggers an internal delay timer. This delay timer […]

Filed Under: Battery Charger Circuits Tagged With: BQ7718, Cell, Charger, Series

Digital Thermometer Circuit – Uses a Solar Cell for Power

Last Updated on June 9, 2020 by Swagatam Leave a Comment

light thermometer 1

The articles explains a digital thermometer circuit project that works without a battery. Instead of a battery the circuit utilizes a small solar cell and operates by deriving power from the ambient light available from the surrounding light sources. This allows the circuit to be extremely compact, light weight, versatile and hassle free while measuring […]

Filed Under: Health related Projects, Meters and Testers Tagged With: Cell, Digital, Power, Solar, Thermometer, Uses

How to Make a Solar Cell from a Transistor

Last Updated on January 23, 2024 by Swagatam 7 Comments

2N3055 into solar cell

The majority of newbie electronic hobbyists would certainly have a couple of burned up power transistors such as 2N3055 hiding inside their junk box. Supposing we have their internal semiconductor junctions still intact, the device could be transformed into a nice little solar cell by filing or sawing off the top cap of the device, […]

Filed Under: Solar Controller Circuits Tagged With: Cell, Solar, Transistor

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