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Newly Updated Circuit Projects:

Timer Circuits with Auto Pause and Memory During Power Failures

Last Updated on July 6, 2019 by Swagatam 35 Comments

timerpowermainsfailurecorrection

In this post we try to investigate a couple of  innovative solutions which could be used for pausing the counting process of a timer IC during power failures, and also restart the process when mains is restored, ensuring a continuous functioning of the timer without errors. The idea was requested by Mr. Arun Dev. Technical […]

Filed Under: Timer and Delay Relay Tagged With: Auto, Circuits, During, Memory, Pause, Timer

Parallel Battery Charger Circuits Explained

Last Updated on May 17, 2026 by Swagatam 19 Comments

In this post I have explained two methods of connecting batteries in parallel. The first one below deals with changeover circuit using SPDT switches to charge multiple batteries individually or collectively. These may be connected in parallel using a single battery charger and through a manual SPDT changeover switch bank. The seconds design talks about […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Charger, Circuits, Explained, Parallel

Greenhouse Motorized Water Diverter and Humidity Controller Circuit

Last Updated on June 30, 2026 by Swagatam 2 Comments

valve motor operator circuit

In one of the previous posts I have explained the making of a greenhouse temperature controller circuit, here we study how the effects may be enhanced through an automatic water valve actuator and humidity controller circuits. The idea was originally requested by Mr. Leandros Komninos Technical Specifications Found one on ebay, these are the detail […]

Filed Under: Motor Controller Tagged With: Controller, Diverter, Greenhouse, Humidity, Motorized, Water

Capacitor Based LED Tubelight Using 1 Watt LEDs

Last Updated on June 1, 2026 by Swagatam 36 Comments

LED TUBE FINAL

In this post I have explained the construction of a homemade 100 watt capacitive tubelight circuit using 1 watt LEDs. The idea was requested, constructed, tested and verified by one the avid readers of this blog Mr. Tamam. Let’s go through the entire discussion. Discussing the Proposed The Design I regularly visit your blog, and […]

Filed Under: Lamps and Lights Tagged With: Based, Capacitor, LED, LEDs, Tubelight, Watt

Underwater LED Boost Converter Circuit with Dimmer

Last Updated on June 1, 2026 by Swagatam 56 Comments

under water light controller circuit

In this post I have explained an LED controller circuit having a boost and dimming facility specifically designed for underwater shooting application. The idea was requested by Mr. Svein. The Circuit Request I came across your blog at https://www.homemade-circuits.com and thought I’d ask you a question regarding building or modifying a LED driver. I planning […]

Filed Under: Lamps and Lights Tagged With: Boost, Converter, Dimmer, LED, Underwater

Infrared (IR) Controlled LED Emergency Lamp Circuit

Last Updated on June 1, 2026 by Swagatam 22 Comments

Here I have explained a an emergency lamp circuit which includes an infrared remote operated brightness control feature. The  idea was requested by Mr. Heeran Technical Specifications Can you please help me with two circuits. I want to build a backup  led emergency lamp that works via an infrared remote . I want it to […]

Filed Under: Lamps and Lights Tagged With: Controlled, Emergency, Infrared, IR, Lamp, LED

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