In this post I have explained how a landline telephone can be rigged up wirelessly with a small transmitter circuit, enabling easy tapping of the telephone, by transmitting the conversations […]
New Circuit Projects
Difference Between Op amp and Comparator
In this article I have explained the main differences between op amp and comparator, and try to understand why op amps are not ideally suited to be used like compartaors. […]
Cellphone Controlled Plant Watering Circuit
In this article I have explained a couple of circuits that will allow automatic watering of plants and flower pots, even while the owner of the house is away from […]
Vehicle Parking Lot Counter Circuit
In this post I have explained how to construct a vehicle counter circuit that can count the number of vehicles entered in a parking lot at office building, schools, libraries, […]
IC 7805 Variable Power Supply Circuit [5V to 15V]
Although, a 7805 IC is mostly used as a fixed 5 V voltage regulator, it is possible to configure a 7805 IC to produce a variable output from 5 V […]
Electronic Acupuncture Circuit [Bio-Stimulation Circuit]
In this article I have explained how to build an electronic acupuncture circuit, also called bio-stimulation circuit., and use it for a possible treatment of many common body ailments, without […]