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Bass and Treble 28 Aug 2011 | 01:50 am
Bass and Treble Modern audio frequency amplifiers provide flat frequency response over the whole audio range from 16 Hz to 20 kHz. To get faithful reproduction of sound we need depth of sound, ...
Two Door Doorbell 26 Aug 2011 | 08:42 pm
The circuit described her is different form conventional door bell circuits in the sense that it can produce two different tones-one of a lower frequency and the other of a much higher frequency. T...
Automatic Battery Charger 24 Aug 2011 | 12:29 am
Normally, chargers available in the market do not have any sort of control except for a rotary switch that can select different tapping on a rheostat, to vary the charging current. This type o...
Emergency Light 23 Aug 2011 | 02:07 pm
The circuit of emergency light presented here is unique in the sense that it is automatic, compact, reliable, low-cost, and easy to assemble for anyone. The circuit consists of four sections, nam...
Smart Clap Switch 23 Aug 2011 | 01:32 pm
Smart Clap Switch Circuit of a smart clap switch, incorporating certain unique features,is presented here. It overcomes the shortcomings observed in normal clap switches. The following two spec...
Laser Controlled Switch 23 Aug 2011 | 12:26 am
This circuit is built around a 555 timer using very few components. Since the circuit is very simple, even a novice can easily build it and use it as a controlling device. A laser pointer, now e...
Clever Rain Alarm 23 Aug 2011 | 12:10 am
Usually rain-alarms employ a single sensor. A serious drawback of this type of sensor is that even if a single drop of water falls on the sensor, the alarm would sound.There is a probability that ...
Smart Fluid Level Indicator 22 Aug 2011 | 11:27 pm
Most of the fluid level indicator circuits use a bar graph or a seven-segment display to indicate the fluid level. Such a display using LEDs or digits may not make much sense to an ordinary person. Th...
Simple Code Luck System 21 Aug 2011 | 11:16 pm
The circuit described here is of an electronic combination lock for daily use. It responds only to the right sequence of four digits that are keyed in remotely. If a wrong key is touched, it rese...
MULTIPURPOSE CIRCUIT FOR TELEPHONES 20 Aug 2011 | 10:50 pm
This add-on device for telephones can be connected in parallel to the telephone instrument. The circuit provides audio-visual indication of on-hook, off-hook, and ringing modes. It can also be use...
