Simple 1 Hour Timer Circuit with Buzzer

  THE DESIGN CRITERIA to be satisfied by this timer are that it is simple to operate, reliable, pocket sized, has an audio output and is che...

Bathroom Water Heater Timer Circuit Diagram

Any time a photograph is immersed in the fixer, the user presses the start key on the timer, which responds by lighting a LED. Electronic sw...

Digital key with just one button Circuit Diagram

This is a digital key that only uses one button to do on and off. The load is powered by the MOSFET IRFZ44 using an output of IC 4093. Only ...

Switching Power Supply Electronic

Description:  The following circuit shows about Self Switching Power Supply Electronic Circuit Diagram. This circuit based on the 7805 IC....

230 V AC To 400 V DC Power Supply Circuit Diagram

Description                A lot of students are who dont know how to convert 230 volt AC to 400 DC. So today i am published   230 V AC ...

Dual Opamp Buffered Power Supply

There will be instances where the currents from each supply will be unequal. Where this is the case, the resistor divider is not sufficient...

Build a 250 to 5000 watts PWM DC AC 220V Power Inverter

Build a 250 to 5000 watts PWM DC/AC 220V Power Inverter  This is my schematic design of a Pulse Width Modulator DC/AC inverter using the chi...

SP How to Make an AVR Perform Multiple Tasks

This article describes a way to create an AVR perform multiple tasks. Beginners who want to urge an in-depth information in AVR assemble lan...

Smart dc power box circuit schematic

This little circuit can assist you to get rid of all surplus tiny ac mains adaptors from your desktop. The circuit is nothing, however a s...

Cheap Pump Controller

This simple but effective circuit can be used to control water level in a container. The prototype is used to pump water out of a bucke...

AC Mains Bistable Switch

AC Mains Bistable Switch Circuit Diagram. This AC mains-operated bistable  switch turns on or turns off a  device using a miniature neon  l...

EE ternal Blinker

You occasionally see advertising signs in shops with a blinking LED that seems to blink forever while operating from a sin-gle battery ...

LED Photo sensor

LED Photo sensor Circuit Diagram. It is not always necessary to use special photoresistors or phototransistors to make light-sensitive swit...

Simple Meter Impedance speaker Circuit Diagram

A simple impedance meter can be useful to measure the actual impedance of a speaker or headset, ideal for anyone working with sound, makin...

Intelligent Presence Simulator

However effective a domestic alarm system may be, it’s invariably better if it never goes off, and the best way to ensure this is to ma...

Heater and Ventilation Control

This is a guest post by our visitor Etienne F. For any questions please contact the author (email address link is given below). This circu...

No Fly Zone LED

Some places and things need full focus and concentration. its in these places where such a toy will become as annoying as a fly circling r...

Inverter Overload Protector

An overload condition in an inverter may  permanently  damage  the  power transistor array or burn off the transformer. Some of the dom...

TDA2052 Active Audio System

This active audio audio system use three TDA2052 chips and 5 speakers ( one woofer, two tweeters and two midranges ). For this TDA2052 ac...

Power Supply Switched 15V x 6A Circuit Diagram

This circuit is a switching power source , or SMPS , it is based on the MC33374 integrated circuit , which is a switching voltage r...

Infrared Radar System

Chris from PyroElectro.com has a great article about a do-it-yourself radar system build with PIC18F452. It’s a great hobby project althoug...

Simple Accurate Bass Tone Control

A difficult problem in the design of conventional stereo tone controls is obtaining synchronous travel of the potentiometers. Even a slight...

Multiplexer Switch with 4066 Circuit Diagram

This is a switch circuit using a digital multiplexer 4066 Ic , their keys are ES8 ES1 to 4066 and each contains four switches. When the chan...

Build a Simple FM Transmitter Circuit Diagram

Build a Simple FM Transmitter Circuit Diagram . This FM transmitter is about the simplest and most basic FM transmitter it is possible to ...

Simple Audio Power Meter Circuit

This simple circuit indicates the amount of power that goes to a loudspeaker. The dual-color LED shows green at an applied power level of ab...

Tuned Radio Frequency TRF Receiver

Tuned Radio Frequency (TRF) Receiver Circuit diagram. Super heterodyne receivers have been mass-produced since around 1924, but for reasons...

Acoustic Distress Beacon

An ELT (Emergency Locator Transmitter, also known as a distress beacon) is an emergency radio transmitter that is activated either manu...

Build A Relay Toggle Switch

Half of RL1 and RL2 manipulate the switching and the other is connected to an application. Relays are 200 ohms above ground and at one poin...

Simple Siren Circuit

This circuit will generate siren sound when S1 pressed and increate sound frequency becuase capacitor C1 charged when switch S1 released th...

Simple Micro Inverter circuit DC voltage AC 12v x110v

This is a micro - inverter DC voltage to AC from a 12v battery can generate a voltage of 110 or 220 volts AC and a frequency of...