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New Circuit Projects

3 Tested 220V High and Low Voltage Cut OFF Circuits Using IC LM324 and Transistors

Last Updated on January 19, 2024 by Swagatam 176 Comments

over2Bvoltage2Bprotector

An AC mains high/low cut-off device will cut off or disconnect the mains supply from home electrical whenever a high voltage or low voltage situation is detected. In this way it ensures total safety to the home wiring and appliances from fire hazards, due to abnormal over voltages, brown outs or low voltages. In this […]

Filed Under: Voltage Control and Protection Tagged With: 220V, Circuits, High, OFF, Tested, Voltage

220V Solid State Relay (SSR) Circuit using Triac and OptoCoupler

Last Updated on January 19, 2025 by Swagatam 40 Comments

ssr 3

An AC mains solid state relay or SSR is a device which is used for switching heavy AC loads at mains level, through isolated minimal DC voltage triggers, without incorporating mechanical moving contacts. In this post I have explained how to construct a simple mains operated solid state relay or an SSR circuit using a […]

Filed Under: Datasheets and Components Tagged With: 220V, Relay, Solid, SSR, State, Triac

12V LED String Light Flasher Circuit for Christmas Decoration

Last Updated on January 18, 2025 by Swagatam 14 Comments

flasher

Looking for a simple 12 V LED string light flasher circuit for your next Christmas decoration project? Learn how easy it is to build a LED wig wag string light flasher using just a couple of transistors and few other passive components. LED Flashing String Lights for Decorating Homes A LED flasher schematic has also […]

Filed Under: Mini Projects Tagged With: 12V, Christmas, Flasher, LED, Light, String

Make an LED AC Voltage Indicator Monitor Circuit

Last Updated on November 7, 2023 by Swagatam 7 Comments

mainsacvoltagemonitor

The LED AC mains voltage level indicator is a circuit that can be used for displaying and monitoring the instantaneous voltage level of any 220 V or 120 V mains home AC input, through a correspondingly rising and falling LED bar graph. A simple construction and accurate result are the main features of this tiny […]

Filed Under: Sensors and Detectors Tagged With: AC, Indicator, LED, Monitor, Voltage

How To Calculate and Connect LEDs in Series and Parallel

Last Updated on November 7, 2023 by Swagatam 63 Comments

LED series

In this article I have explained how to calculate LEDs in series and parallel using a simple formula and configure your own personalized LED displays, now you don’t just have to wonder how to wire led lights? but actually can do it, know the details here. These lights are known not only for their dazzling […]

Filed Under: Electronics Theory Tagged With: Calculate, Connect, LEDs, Parallel, Series

Simple LED Tubelight Circuit

Last Updated on December 4, 2024 by Swagatam 88 Comments

LED2Btube252C2BMOV

An LED tube-light is lighting device built using high efficiency LEDs for illuminating a premise where it is installed, through the available AC mains supply. In this post I have explained the complete construction details of a simple LED light tube light circuit using 20 mA, 5 mm high bright white LEDs. The circuit can […]

Filed Under: Lamps and Lights Tagged With: LED, Simple, Tubelight

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