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PWM Solar Battery Charger Circuit

Last Updated on December 23, 2021 by Swagatam 138 Comments

This simple, enhanced, 5V zero drop PWM solar battery charger circuit can be used in conjunction with any solar panel for charging cellphones or cell phone batteries in multiple numbers […]

Filed Under: Battery Chargers, LM317/LM338, Solar Controllers, TL494 IC

Battery Current Indicator Circuit – Current Triggered Charging Cut off

Last Updated on December 9, 2020 by Swagatam 30 Comments

In this post we learn about a simple battery current sensor with indicator circuit which detects the amount of current consumed by the battery while charging. The presented designs also […]



Filed Under: 324 IC Circuits, Inverter Circuits, Sensors and Detectors

2 Automatic Heatsink Temperature Controller Circuit

Last Updated on December 6, 2021 by Swagatam 43 Comments

In this post we study about a automatic fan speed regulator circuit for controlling the temperature of a heatsink and from preventing the temperature to reach dangerous levels. This approach […]

Filed Under: Motor Controller

How to Make a 3 Phase VFD Circuit

Last Updated on August 6, 2021 by Swagatam 331 Comments

The presented 3 phase VFD circuit (designed by me) can be used for controlling the speed of any three phase brushed AC motor or even a brushless AC motor. The […]

Filed Under: 3-Phase Power, Motor Controller

How to Build a Grow Light Circuit

Last Updated on June 23, 2019 by Swagatam 7 Comments

The post discusses a typical grow light circuit application for plants in order to stimulate photosynthesis effect in an artificially lit environment using multicolored LEDs. The idea was suggested by […]

Filed Under: LED and Light Effect

32V, 3 Amp LED Driver SMPS Circuit

Last Updated on February 16, 2022 by Swagatam 172 Comments

The article presents a 32V, 3 amp SMPS circuit which may be specifically used as an SMPS 100 watt LED driver, rated with the same specs. The circuit of the […]

Filed Under: LED and Light Effect, SMPS



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