Timer for Mosquito Destroyer
In electric-heating mosquito repellents, an electric vaporiser heats up a mat or liquid to release non-degrading chemicals into the air and keep the mosquitoes...
Pushbutton Control For Single-Phase Appliances
This circuit lets you switch off and switch on a single-phase appliance using two separate push switches. Such an arrangement is common for industrial...
WiMAX Testing, Step by Step
Based on orthogonal frequency-division multiple-access (OFDMA) and multiple-input multiple-output (MIMO) technologies, WiMAX systems require specialised test equipment from design to deployment stage
SHWETA DHADIWAL BAID
Worldwide...
Industry-Grade Equipment For Academia
Engineers are created in labs. Hence it is essential to keep the lab equipment current and close to the real world to create engineers...
Doorbell-controlled Security Switch
One way to check whether anybody is at home is to ring the doorbell. Burglars too use this very technique. The circuit described here...
ELECTRONIC CANDLES
Here is a simple circuit that can produce the effect of candle light in a normal electric bulb. A candle light, as we all...
TELEPHONE CALL RECORDER
Today telephone has become an integral part of our lives. It is the most widely used communication device in the world. Owing to its...
Smart Loop Burglar Alarm
Simple loop burglar alarms sound whenever the loop breaks. What if a clever thief comes to know of the working of this alarm? He...
CAR-REVERSING HORN WITH FLASHER
Here is a simple circuit that starts playing the car horn whenever your car is in reverse gear. The circuit (refer Fig. 1) employs...
Stereo Headphone Amplifier
Here is an inexpensive circuit for a stereo amplifier to drive a low-impedance headphone set. The circuit uses a few cheap transistors (BC547 and...
