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Newly Updated Circuit Projects:

IC 723 Voltage Regulator – Working, Application Circuit

Last Updated on January 14, 2025 by Swagatam 35 Comments

IC723 block diagram

In this post I have explained the main electrical features, pinout specifications, datasheet, and application circuit of the IC 723. The IC 723 is a general purpose, extremely versatile voltage regulator IC, which can be used for making various types of regulated power supplies such as: Main Features ABSOLUTE MAXIMUM RATINGS Pinout Functions Pin 1 […]

Filed Under: Power Supply Circuits Tagged With: 723, Application, Regulator, Voltage, Working

Voltage Regulator Circuits and Projects

Last Updated on January 2, 2024 by Swagatam 30 Comments

zener stabilzed power supply

In this article I will comprehensively discuss how to make customized transistorized voltage regulator circuits in fixed modes and also variable modes. All linear power supply circuits which are designed to produce a stabilized, constant voltage and current output fundamentally incorporate transistor and zener diode stages for getting the required regulated outputs. These circuit projects […]

Filed Under: Power Supply Circuits Tagged With: Circuits, Projects, Regulator, Voltage

Ultrasonic Pest Repellent Circuit

Last Updated on September 25, 2026 by Swagatam 79 Comments

ultrasonic pest repeller

The explained Ultrasonic Pest repeller is a device that generates ultrasound or a very high frequency noise in the range of over 20 kHz which becomes useful for repelling or scaring away animals like stray dogs, cats, mice bats, etc. This becomes possible since these animals are able to easily detect the frequencies at this […]

Filed Under: Pets and Pests Tagged With: Pest, Repellent, Ultrasonic

Easy Two Transistor Circuit Projects for School Students

Last Updated on June 23, 2026 by Swagatam 18 Comments

NPN astable

A variety of small school projects can be built using just two transistors. This compilation includes a collection of practical and fascinating circuit ideas using just a few number of parts. Any small signal transistor can be used in the proposed two transistor circuit, such as BC547, 2N2222, 2N2907, BC108, BC107, TIP32, TIP31, 188, 8050, […]

Filed Under: Mini Projects Tagged With: Easy, Projects, School, Students, Transistor

Simple Circuits using IC 7400 NAND Gates

Last Updated on June 23, 2026 by Swagatam 26 Comments

NOT

In this article I will elucidate many assorted circuit ideas built using NAND gates from ICs such as IC 7400, IC 7413, IC 4011, and IC 4093 etc. IC 7400, IC 7413 Specifications The I.C.s 7400 and the 7413 are 14 -pin DIL ICs, or “14 pin Dual In Line Integrated Circuits”, where pin 14 […]

Filed Under: Mini Projects Tagged With: 7400, Circuits, Gates, NAND, Simple

Red LED LightStim Circuit for Removing Facial Wrinkles

Last Updated on May 24, 2026 by Swagatam 11 Comments

light color spectrum

An LED based LightStim is a device used for rejuvenating facial skin by stimulating cell growth. Normally, RED LED is used in these devices since red light have been found to be working the best for improving skin health, by eliminating facial wrinkles. Blue LED light have proved more effective against harmful bacteria responsible for […]

Filed Under: Health related Projects Tagged With: Facial, LED, LightStim, Removing, Wrinkles

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