This article is for Three LED Blinking Circuit with NPN Transistors that uses 3 NPN transistors, resistors, capacitors and a 9V battery, which works as an astable multivibrator, so it does not need any external clock signal. Instead, the circuit creates its own oscillation, because of this, the LEDs alternately flash ON and OFF at […]
LED and Lamps
Simple Neon Lamp Fuse Blow Alarm Circuit
This post is for a Simple Neon Lamp Fuse Blow Alarm Circuit which helps us know when the fuse in the AC mains line gets open or blown. Normally, when the fuse is healthy, current flows through it and the load works in normal condition, when the fuse blows, the load stops working but at […]
Diode Tester Circuit using Op-Amp and LED
In this tutorial, we build a simple diode testing circuit which is very useful for beginners in electronics as it gives good learning and practical use. Normally, we use a multimeter to test a diode easily but sometimes a normal meter does not test all diode types properly. For example, a Schottky diode works on […]
Adjustable 4 LED Flasher Circuit using Transistors
This Adjustable 4 LED Flasher Circuit using Transistors is a simple and useful electronics project for beginners which uses two 2N2222 transistors, four LEDs, capacitors, resistors and one variable resistor for speed adjustment. The main purpose of this circuit is to flash four LEDs in an alternating pattern, two LEDs glow first and then the […]
Simple 1.5V Single Cell LED Flasher Circuit
In our previous article, we made a Simple 1.5V White LED Flasher Circuit using transistors and ferrite coil, but in this article we have design a Simple 1.5V Single Cell LED Flasher Circuit without ferrite coil. This circuit works only with one 1.5V battery cell, so it is very useful for small battery projects and […]
Automobile Engine Overheat Alert Circuit using LED
Many a times, automobile engine heat problem has become very common, engine gets too hot and driver is not aware of it early, because of this, engine damage can happen and repair cost becomes high, so we need simple system which can give early warning. This project shows a small and low cost heat alert […]