Learn and build electronic circuits
The Bug detector is a highly sensitive transmitter detector designed to detect transmitters with an output power as low as 10mW, even from a distance of approximately 15 feet. This ingenious device offers a simple and efficient solution for locating bugs and dealing with them effectively. How it Works Equipped with a sensitivity control, skilled … Read more
In this post we discuss several different types of electronic touch switch circuit, which can be used to toggle an electrical load simply by touching a piece of metal connected at the input of the circuit. I an electronic touch switch circuit we have an input metal pad, and an attached electronic circuit which sensed … Read more
This non contact inductive current sensor circuit is designed to detect an alternating current (AC) flow within any circuit and its cables, without undergoing any direct contact with the conductor, or breaking of the insulation. In the Figure below, you can observe this circuit is able to sense almost anything that moves through a wire … Read more
This High-Gain Current Sensor circuit can be deployed to detect the availability of low-level current flowing though a PCB’s copper lines or traces. Two straight-pin probes are utilized to form contact with the PCB’s copper trace. This action diverts a tiny portion of the current from the examined circuit to the current-sensing circuit. How it … Read more
The final circuit we will see deploys the ceramic sensor that is readily available. If you have experienced the difficult to detect the source of a low noise knock or ping in a mechanical device, then construct this circuit which works as a knock detector and locator. The applications are various including in a vehicle, … Read more
Sound triggered switches are employed in several applications, a few common illustrations being voice controlled tape recorders, baby alarms, burglar alarm systems, and VOX (voice managed switching) techniques of radio transmitting/receiving installations. The straightforward sound operated switch circuit demonstrated here will probably work at a distance of up to around 2 or 3 metres from … Read more