Plate Detector
No description available.
Beat Balance Metal Detector
Various embodiments of the BB metal detector have been published, and it has been widely described in the press as a new genre. Instead of using a search and a reference oscillator as with BFO, or Tx and Rx coils...
Doorknob Proximity Alarm for wooden door
Reverse engineered circuit diagram of a popular retail doorknob alarm. It contains a small transmitter and the doorknob acts as an antenna so it will not work on a metal door. When a person comes close to the doorknob this...
Park Aid
This circuit was designed to assist in parking a car near the garage wall while reversing. It includes a proximity sensor as part of the electronics project and circuit diagram.
The parking assistance circuit employs a proximity sensor to detect the...
Presence detector proximity sensor circuit
This circuit responds to the presence of any conductive object, including humans. It does not detect object movement but can function as a proximity sensor.
The circuit operates on the principle of capacitive sensing, utilizing a capacitor to detect changes in...
Metal Detector Circuit
Metal Detector Circuit Overview The metal detector circuit is an electronic circuit that is specifically designed to detect metal that lies deep in the water.
The metal detector circuit operates on the principle of electromagnetic induction, where a coil generates an...
Proximity sensor - Page 2
The circuit operates but exhibits instability, particularly with temperature variations. For example, upon powering it on and tuning it, switching it off and on again affects its performance. The control voltage (CV) output is essential for the theremin/controller circuit. This...
Metal Detector Circuit
The device being constructed will serve as a metal detector, capable of locating metal objects such as coins, nails, and keys, including car keys that may be misplaced. It can also detect gold, although it may not possess industrial strength....
Simple Proximity Detector & Alarm Circuit
This is a simple proximity switch utilizing the IC 4049. The IC 4049 is a bipolar monolithic integrated circuit designed for metal detection systems and proximity sensing applications. It includes an oscillator formed by an external parallel resonant tank circuit...
Metal detector 2
The metal detector described in the example can detect metal objects made of highly permeable magnetic substances. The circuit operates based on several components: a power circuit, a sine wave oscillator, a PLL (phase-locked loop) circuit, and a hybrid amplification...