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Intermediate Projects

Simple Soldering Iron Temperature Regulator

Soldering irons are available in different wattage and usually run at 230V AC mains. However, these have no temperature control. Low-voltage soldering irons (e.g.,...

Tachometer

Non-Contact Type Digital Tachometer Low-Cost Tachometer Simple Tachometer DIY Tachometer built with a Microcontroller. The article was originally published in December 2010...

Power Suppy Failure Alarm

The power supply failure alarm circuit presented here needs no additional supply source as it employs an electrolytic capacitor to store adequate charge...

Experimental Study of Switched Capacitor Circuit

In recent years switched capacitor circuit has gained popularity due to their suitability in integrated circuits. The two major problems faced by IC designers are: 1....

Dual Audio Signal Tracer

The circuit described here is of a dual audio signal tracer. An audio signal tracer is a simple device used to troubleshoot for audio...

Automatic Bathroom Light with Back-up Lamp

Sometimes we forget to switch off the bathroom light and it remains on unnoticed for long periods. This automatic bathroom light circuit solves the...

Mains Supply Failure Alarm

When ever AC mains supply fails, this mains supply failure alarm circuit alerts you by sounding an alarm. It also provides a backup light...

Manual EPROM Programmer

The programmer devices required for programming the electrically programmable read only memories (EPROMs) are generally expensive. Here is a low-cost EPROM programmer circuit to...

Wireless Stepper Motor Controller

Here is a low-cost and simple wireless stepper motor controller using infrared signals. Using this circuit you can control the stepper motor from a...

Digital Frequency Comparator

Here’s a digital frequency comparator for oscillators that indicates the result through a 7-segment display and a light-emitting diode (LED). When the frequency count...

Microcontroller Projects: RGB Colour Generator

Presented here is a red, green and blue or RGB colour generator using AT89C2051 microcontroller (MCU). This is a simple and low-cost circuit for...

Smart Foot Switch

This is a circuit that can be used to switch on and off two devices alternatively or both together by using switches. Two switches are for each device to turn them on and switching off other device, also it has a separate switch with an option to turn on both the devices simultaniously.

Automatic Soldering Iron Switch

Soldering irons are most often used for installation, repairs, and limited production work in electronics assembly. High-volume production lines use other soldering methods. You...

Programmable Timer for Appliances

This is a circuit for a programmable timer that can be used to switch on/off a device after a pre-set time period that can be varied from 8 seconds to 2 hours. It works in two modes, cyclic mode and off mode that can be switched by using a slide switch.

Multiband Transmitter

A radio frequency oscillator is at the heart of all radio transmitters and receivers. It generates high frequency oscillations, which are known as carrier...

Versatile LED Display

This versatile LED display circuit uses an erasable programmable read-only memory (EPROM) to display various light patterns on LEDs. Since bicolour LEDs (comprising green...

Sound Operated Intruder Alarm

When this sound operated intruder alarm detects any sound, such as that created by opening of a door or inserting a key into the...

Soldering Iron Temperature Controller

When soldering, sometimes the need arises to control the temperature of the soldering iron. It is not possible to change the solder iron every...
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