Inductive proximity switch works - Solutions - Huaqiang

Probe domestic switch needle KG-300K needle head diameter is 3.0mm normally open switch needle

100V, 250mA, surface mount, high speed switching diode

Crystal oscillator

Quartz Oscillator 3225 20M OSC

The inductive proximity switch belongs to a position sensor with a switching output. It consists of an LC high-frequency oscillator and an amplification processing circuit. When a metal object approaches the oscillation induction head capable of generating an electromagnetic field, an eddy current is generated inside the object. This eddy current reacts to the proximity switch, causing the proximity switch to oscillate and the internal circuit parameters are changed, thereby identifying the presence or absence of a metal object, thereby controlling the on or off of the switch. The object that this proximity switch can detect must be a metal object.