In this post I have explained 9 simple metal detector circuits using LC tuned concept, magnetic absorption concept, and the beat frequency oscillator (BFO) concept. The BFO technique is considered to be the most accurate and reliable methods of detecting metals. 1) Metal Detector Circuit Using a Single UJT The first metal detector circuit shown […]
Sensors and Detectors
Automatic PWM Door Open/Close Controller Circuit
In this post I have explained a simple PWM controlled automatic turnstile or door circuit featuring an automatic open/close action via a photo-interrupter stage. The idea was requested by Mr. Bruce Clark. Technical Specifications Thank you for a really fantastic service you provide. Would you please be so kind as to help me with a […]
4 Simple Proximity Sensor Circuits – Using IC LM358, IC LM567, IC 555
Video Demonstration An IR proximity sensor is a device which detects the presence of an object or a human when it is within a predetermined range from the sensor, through reflected infrared beams. Three useful proximity sensor concepts are explained here, the first concept is based on an ordinary opamp LM358, the second one using […]
Check What’s Behind the Paint of a Used Car
Some methods to hide a used car’s external deterioration include filling up rust holes, removing collision dents with putty, fiberglass, or epoxy, and painting the car. The outside condition of an automobile is very important to potential used car purchasers due to the high cost of extensive bodywork restoration. Here is a simple circuit concept […]
Home Electromagnetic Radiation Detector Circuit
The assembly proposed in these lines is an electromagnetic radiation detector (power and others) that allows the user to organize their living space with full knowledge. Circuit Description The sensor used for this design is a simple wire coil (L1) associated with the MOSFET transistor (T1) biased at the beginning of its conduction zone by […]
Non-Contact Current Sensor Circuit Using Hall-Effect IC
In this article I have explained about a simple non-contact current sensor circuit using a hall effect sensor IC. Why Hall Effect Sensor When it comes to sensing current (Amps) linear Hall-effect devices are the best and the most accurate. These devices can sense and measure current right from a few amps to many thousands. […]