Blinking two LEDs using CD4047 is one of the simplest and most useful beginner electronics projects and this circuit uses the CD4047 IC in astable mode, so it generates a continuous square wave output without any external trigger. Because of this, the two LEDs blink one after another continuously, in which one LED turns ON […]
LED and Lamps
How to Test SCR using LED and 9V Battery Circuit
This article is about simple SCR tester circuit, where we can use this circuit to check SCR is good or faulty. The circuit uses one 9V battery, one LED, three 100 ohm resistors and two push button switches. The circuit is very easy to build as it is also very useful for students, hobby users […]
Three LED Blinking Circuit with NPN Transistors
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 […]
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 […]