Door Lock Circuit using Digital Code

In this post we try to analyze a simple door lock circuit using digital code that needs to pressed with a unique sequence in order to activate the door lock system and unlock it. Anyone who has ever locked him or herself out with the front door key inside will appreciate the electronic door-opener described […]

Read More »

Car Lights ON Warning Circuit

The article explains  how to build a simple car lights ON warning circuit for enabling the driver to learn about the a car light accidentally left switched ON after a preset delay from the time the ignition was switched . Anyone who has ever forgotten to switch the car lights off, after having driven in […]

Read More »

Simple Temperature Indicator using BC547 Transistor

The post explains a simple temperature indicator circuit using a single BC547 transistor and complementary 1N4148 diode. The temperature indication of a heat sink on a power transistor in high power circuits can be extremely useful. A simple, inexpensive temperature indicator would be ideal for this purpose since accuracy is not an important factor. In […]

Read More »

Simple Electronic Pinball Game Circuit

This highly portable electronic pocket pinbaIl game circuit may not exactly be a substitute for its big brothers in the amusement arcades, but it still provides a lot of fun. The circuit is relatively simple: three CMOS ICs, nine LEDs, six resistors, one capacitor, one push- button and a 9 V battery. Together with R1, […]

Read More »

Simple Continuity Tester Circuit

Using this simple continuity tester circuit continuity among a pair of points could be examined effortlessly by using a multimeter. However multimeter simply being a costly gadget, several amateurs don’t have one of their very own. Apart from that, for each test, you have switch your eyes on the meter, and also the test prods […]

Read More »

Simple Dark Room Timer Circuit for Photographers

A basic dark room timer circuit for photographers works on a solitary 1.5V cell and flashes a neon light is detailed below. As the time frequency are visible, it is quite simple to record time lapsed even in darkness. Transistor Tl actuates transistor T2 instantly. Output of the A transistor pair is within phase having […]

Read More »

Simple Lamp Flasher Circuit

In this post we learn how to make a simple miniature lamp flasher circuit using some inexpensive transistors, resistors and capacitors. Let’s learn the details below: A lamp flasher is a device which is designed and used for switching a connected lamp alternately ON/OFF at a certain given rate per second. Meaning, a lamp or […]

Read More »

Simple Electronic Gong Circuit

This electronic gong circuit simulates the sound of a bell or a gong; The circuit consists of a resonant filter, built around IC2 and IC3, which rings at its resonant frequency when a short pulse is fed to the input. In this circuit the trigger pulse is provided by a 555 timer connected as a […]

Read More »

Sine wave Generator Circuit using Wein Bridge Oscillator

The post narrates a simple yet accurate sine wave generator circuit using a typical Wein bridge oscillator A Wien bridge oscillator is actually a form of electronic oscillator which builds sine waves. It could possibly produce a wide variety of frequencies. The oscillator is dependent on a bridge circuit formerly formulated by Max Wien in […]

Read More »

Automatic Submersible Pump Controller Circuit with Dry Run Protection

This simple automatic submersible pump controller circuit equipped with a dry run protection will allow 3 parameters to be controlled using a a single chip circuit. Let’s learn the details from the following explanation. The design is constructed around a single IC 4049 whose 6 NOT gates are appropriately configured to control 3 important parameters […]

Read More »