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Make this Solar Charger Circuit with Auto Cut-Off Using Only Transistors

Last Updated on March 7, 2025 by Admin Leave a Comment

solar charger circuit diagram for 18650 battery

Ok, so here we see a very simple solar charger circuit that works without any ICs. We use only transistors and it automatically cuts off when the battery is full. […]

Filed Under: Battery Chargers, Solar Controller Circuits Tagged With: Auto, Charger, Cut, Off, only, Solar

Dry Run Protector Circuits using Transistors only

Last Updated on December 29, 2024 by Admin Leave a Comment

motor2Bdry2Brunning2Bpreventor2Bcircuit

The basic dry run protection circuits using BJTs shown here provide simple ways to check for low water levels in an underground tank but without needing to use probes inside […]

Filed Under: Water Sensor and Controller Tagged With: Circuits, Dry, only, Protector, Run, Transistors

Water Level Controller Circuit using only Transistors

Last Updated on November 17, 2024 by Admin Leave a Comment

water

I have got this gadget called an automatic water level controller circuit. It’s pretty neat, it checks if the water in my tank is too low or too high and […]

Filed Under: Water Sensor and Controller Tagged With: Controller, Level, only, Transistors, Water

Battery Status Indicator Circuit using two Transistors only

Last Updated on November 25, 2018 by Admin Leave a Comment

Often a backyard electronic system could become imperfect as a result of a perishing battery. If the battery voltage is no more than 9V for a 12V operated system, the […]

Filed Under: Indicators Tagged With: Battery, Indicator, only, Status, Transistors, Two

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