Capacitive SensorCircuit


Posted on Feb 5, 2014

The purpose of this circuit is to animate shop-windows by means of a capacitive sensor placed behind a post-card-like banner. The card is placed against the glass inside the shop-window, and the visitor can activate the relay placing his hand on the card, from the outside. Especially suited for toy-shops, the circuit can activate model trains, sma


Capacitive SensorCircuit
Click here to download the full size of the above Circuit.

ll electric racing cars, lights etc. Further applications are left at user`s imagination. Adopt it to increase the impact of your shop-window on next Christmas season! Q1, Q2 & Q3 form a high impedance super-Darlington that drives the relay, amplifying the 50 or 60Hz alternate mains-supply frequency induced in the sensor by the human body. C1, D2 & D3 ensure a clean switching of the relay. Power supply can be any commercial wall plug-in transformer adapter with rectifier and smoothing capacitor, capable of supplying the voltage and current necessary to power the relay you intend to use.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Multipattern Running LEDs
    Manage the application of the chip in high-performance linear lithium battery charge
    Commodore 64 Keyboard Joystick & Paddle Interfaces
    A user friendly boost DC DC converter topology
    Simple Switched Servo Driver
    Dual-Slope Integrating ADC
    HOW TO make a cheap narrowband A/F gauge
    TRANSISTORIZED THYRATRON RING COUNTER
    Radio receiver GEOLOG circuit diagram
    EMF sensor circuit diagram
    Flash music gyro schematic



    Top