Puff to OFF LED circuit.
Descrption. This is a simple circuit in which the glowing LED can be switched OFF just by a puff. A condenser mic (M1) is used to sense your puff. When the push button S1 is pressed, the transistors Q2...
View ArticleRemote controlled appliance switch circuit
Description. Here is a versatile remote controlled appliance switch that can ON or OFF any appliance connected to it using a TV remote. IR remote sensor IC TSOP 1738 is used for recieving the signal....
View ArticleTransistor intercom circuit.
Description. Here is a simple but effective intercom circuit that is based fully on transistors.The circuit is based on a three stage RC coupled amplifier. When the pushbutton S2 is pressed, the...
View ArticleNight security light
Description. Here is a simple circuit switches on a light around 2 hours after midnight, the time at which most of the robberies taking place. This simple circuit is build around a CMOS IC 4060 to...
View ArticlePlant moisture level monitor
Description. Here is a simple circuit that will give a visual indication when the soil water level inside your flower pot goes low below a certain limit. The U1C and associated components are wired as...
View ArticleBattery operated heater
Description. Here is a simple heater circuit that can be operated from a 12V battery. The first part of the circuit is an astable multivibrator build around the two transistors Q1 and Q2 .The ON time...
View ArticleElectronic mosquito repeller
Description. Here is the circuit diagram of an ultrasonic mosquito repeller.The circuit is based on the theory that insects like mosquito can be repelled by using sound frequencies in the ultrasonic...
View ArticleLED torch using MAX660
Description. This is a simple LED torch circuit based on IC MAX660 from MAXIM semiconductors. The MAX 660 is a CMOS type monolithic type voltage converter IC. The IC can easily drive three extra bright...
View ArticleHow to make a Rheostat
I have already explained in detail the working of a rheostat. To know more about the component click on the link below. TAKE A LOOK : POTENTIOMETER AND RHEOSTAT – WORKING AND COMPARISON Although the...
View ArticleWater level Controller
Water level controller circuit Note:- We have developed another water level controller circuit using micro controller AT89S51 from Atmel. If you are interested, read that too :- Water level controller...
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