Dual A/C Relay Changeover Circuit for Power Saving and Efficiency

Jun 30, 2014

 The post explains a simple relay changeover circuit which may be used for switching a couple of A/Cs or any similar load alternately in order to avoid misuse and save power.

Input Trigger Synchronized Monostable Timer Circuit Using IC 555

Here we study a simple IC 555 based monostable circuit whose output monostable time duration starts only after the input trigger is released thus making sure that the trigger ON time duration is added with the monostable's pre-programmed ON time duration. The idea was requested by Mr. John Brogan

SMPS 2 x 50V 350W Circuit for Audio Power Amplifiers

Jun 29, 2014

This article will illustrate a simple procedure to devise an unregulated switching symmetric power supply of 350W. This unit can be substituted with the standard audio amplifier power supply to reduce expense and also the weight. The proposed power supply works as a half-bridge with no regulation.

DIY Taser Gun Circuit

Jun 28, 2014

A Taser also known as Stun Gun is one non-lethal electric shock producing unit used to paralyze a person for a time being without causing any severe damage or injury. It is a very useful device, especially to immobilize an attacker.

6V Battery Charger Circuit with Over Current Protection

In this post we learn regarding a simple 6V battery charger circuit with over current protection, which could be used in conjunction with a solar panel, or an AC/DC adapter input.

LM317 IC Tester Circuit

Jun 27, 2014

Here is simple but handy testing circuit for LM317 adjustable voltage regulator IC. I am sure it can be used to test other similar ICs like LM117, LM158, LM358 etc.

Real Time Activated Water Level Timer Controller Circuit

An automatic water level timer controller circuit which responds to a real time clock input is discussed in the following article. The design also includes a water detection stage which makes sure the initialization takes place only in the presence of water in the tank or the pipe. The idea was requested by Miss Soumya Mathur.

Modifying Car Turn Signal Lights, Park-Lights and Side-Marker Lights

Jun 26, 2014

The post explains an innovative circuit modification which allows a single common lamp to be used as a parking light, turn signal indicator light, as well as a side marker light on the relevant positions. The idea was requested by Mr. Chris

Programmable Sequential Temperature Controller and Timer Circuit

Jun 25, 2014

Here we learn about a circuit configuration which produces adjustable sequential timing outputs for controlling a heater device through a simultaneously sequencing temperature controller circuit which can be also preprogrammed for acquiring the desired temperature levels across the sequencing time slots. The idea was requested by Mr. Carlos

Energy Saver Solder Iron Station Circuit


To design a circuit for solder iron which would not only save the energy but also avoid the over-heating of solder iron tip.

Key Finder Circuit - Pet or Kid Tracker Circuit

Jun 24, 2014

Pets and kids (under 4) have one thing in common, they are curious by nature and love venturing into unknown zones ending up in some sort of mess or trouble. Pet or kid tracker equipment which are quite similar to a key finder circuit were specifically designed for solving this issue, here we learn how these work and how to build one at home. The idea was requested by Mr. Akmar.

Electronic Component Buying Guide for New Hobbyists

Jun 22, 2014

Are you a beginner to electronics? Then here are few guidelines which might help you to buy some really useful components.

LED Tube Light Circuit Fitting in Standard Ballast Fixtures

In this article we will study a simple LED tube light circuit which could be directly replaced with faulty 40 watt T17 fluorescent tubes and fitted directly on the existing fixture. Thus the circuit is compatible with all standard iron ballast fixture assemblies.

Cell Phone Triggered RF Night Lamp Circuit

Jun 21, 2014

Feeling difficult to grope for a light switch in deep sleep when someone calls you at night? Then maybe this circuit can solve your problem....This is a very simple basic circuit and is easy to construct compared to other online available circuits which switches on a relay when it detects a cellphone RF signal.

Mini Fence Charger Circuit

Jun 20, 2014

The discussed mini fence charger circuit can be quite handy for driving away pests like cockroaches, slugs, worms, snails from any desired small premise such a terrace garden, balcony pot plants or simply for guarding food stuffs etc.

Upgrading Car Parklights to Enhanced DRLs

In this article we learn a simple circuit idea which can be applied in order to convert existing car park lights into advanced, smart DRL system. The idea was requested by Mr. Chris.

Flashing LED Battery Low Indicator Circuit

Jun 18, 2014

The post explains a simple low/normal battery voltage status indicator circuit through a flashing and a constant LED, where the flashing LED indicates a normal status while the solid indicator warns against a low battery condition. The idea was requested by Mr.Alf.

How to Convert an Inverter to an UPS

An inverter is an equipment which will convert a battery voltage or any DC (normally a high current) into a higher mains equivalent voltage (120V, or 220V), however unlike an UPS inverters may lack one feature, that is these may not be able to switch from mains battery charging mode to inverter mode and vice versa during grid power failure and restoration situations.

Simple High voltage Generator Circuit

Jun 17, 2014

A simple high voltage generator circuit is explained here which can be used to step up any DC level to about 20 times or depending upon the transformer secondary rating.

Making an Ultrasonic Directive Speaker Circuit - Parametric Speaker System

The post explains the construction of a directive speaker system which may be used to transmit an audio frequency over a targetted spot or zone such that the person situated exactly at that spot is able to hear the sound while the person next to him or just outside the zone stays completely untouched and unaware of the proceedings.

Shop Shutter Guard Circuit

Jun 15, 2014

The shop shutter guard circuit discussed here guards your shop when its shutter is closed i.e., at night if an intruder tries to break the shutter, the piezo senses the vibration and the relay is fired to which a 230 volt bulb can be connected which makes the intruder think that someone’s inside.....but he don’t know he’s fooled by you!

Car Radiator Hot Indicator Circuit

Jun 14, 2014

The proposed circuit is very useful which warns the car driver before hand once the radiator gets heated up above the preset level.

Resistor Current Sensor Circuits

In many sensitive electronic circuits or loads, limiting current beyond a set threshold could be one of the most crucial requirements for ensuring a fail proof safety for the various vulnerable devices and components. A simple method of implementing using current sensing resistors has been discussed in this article.

Motor Soft-Start Circuit for Refrigerators

Jun 12, 2014

Refrigerators tend to draw appreciable amounts of current each time their compressor switch ON, and this could happen many times per day. A soft start circuit to the compressor motor could probably tackle this issue and help save electricity. The idea was requested by Mr. Naeem Khan.

PWM Controlled Fan Dimmer Switch Circuit - 120V/220V AC

Jun 11, 2014

In this article we look into a simple mains PWM controlled fan or light dimmer circuit which does not require a microcontroller or costly triac drivers for the intended operations.

Simple Walkie Talkie Circuit

Jun 10, 2014

The article explains a simple walkie talkie circuit that can be easily built by any hobbyist and used for communicating between rooms or floors or simply for having some fun across neighbors and friends. The range of this system is around 30 meters.

Solar Panel Buck Converter Circuit with Over Load Protection

Jun 8, 2014

The post discusses a simple solar panel buck converter circuit which can be used to obtain any desired low bucked voltage from 40 to 60V inputs. The circuit ensures a very efficient voltage conversions. The idea was requested by Mr. Deepak.

Water/Coffee Dispenser Motor Dry Run Protection Circuit

Jun 6, 2014

The article discusses a protection circuit which may be used for preventing a "dry run" situation in mini coffee dispenser motor pumps, by sensing the slight difference in its wet and dry current consumption levels. The idea was requested by Mr. Ken Adler.

Making a "Helping Third Hand" for Aiding Soldering Jobs - School Science Project

Jun 5, 2014

The post explains a step by step construction of a "helping third hand" unit for assisting PCB soldering jobs in order to make the job much hassle free. The gadget could be very handy especially for the new hobbyists. The project was constructed and submitted by Master Ss kopparthy. Let's learn the whole procedure.

0.6V to 6V/12V Boost Converter Circuit

Jun 4, 2014

Normally, we all know that a silicon transistor would find it difficult functioning below 0.7V, unlike germanium counterparts which are capable of doing it with ease, however nowadays we don't often hear about these devices which have become quite obsolete with time.

Designing a Fishing Yo Yo Stop-Motion Switch Circuit with Indicator

Jun 3, 2014

The post discusses a stop-motion switch circuit or a strike indicator for aiding fishing yo yo applications. The idea was requested by Mr. Mike.

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