Analogue Wattmeter
Unlike current or voltage measurement, the measurement of power is somewhat inconvenient as power is the product of voltage (V) and current (I) flowing...
Guitar and Microphone Amplifier Using TDA2005M
This simple audio power amplifier works with guitars and microphones, delivering an output power of around 20W over a load of 4 ohms.
The amplifier...
Audible Logic Probe
Using a conventional logic probe, it is difficult to determine what is happening at a point in a circuit above 50 Hz. The human...
Your Guide To Soldering
Attaining ‘zero defect’ production requires a thorough knowledge of soldering technology. Here is a lowdown on the different kinds of techniques, material and equipment...
Simple Parking Counter
This simple circuit can be used to count the number of cars entering a parking lot.
The circuit is built around comparator LM311 (IC1), timer...
Simple Water Temperature Indicator
When bathing a baby, it’s important that the water is neither too cold nor too hot. You test the water by dipping your fingers...
Driveway Alarm
You can install this system in the driveway itself to detect intrusion by a vehicle, person or large animal. It sounds an alarm when...
Versatile DC-DC Converter
Here is a versatile power coupler that connects a device to 5V-19V DC generated from AC mains by a power adaptor. Power adaptors come...
Intercom Using LM386
Keep in touch with your family members from one room to another and also from outside areas such as the garage, using this intercom...
Laser Demo in ‘C’
Here is a program to demonstrate the working of a laser. Laser is a device that creates a uniform and coherent light, unlike an...