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

    Phantom PS for Microphone
    Simple-ir-detector
    Three-minute-timer
    Full-Wave Rectifier (To 10 Mhz)
    22 Watt Stereo Amplifier
    Solid state voltage indicator with high voltage cutout
    ir remote control home appliances
    GVI Digital Remote Control
    USB Interface Board Tutorial Using PIC18F4550
    Thermostat controller integrated circuit schematic
    Secret Ethernet optical wireless communication drive circuit diagram



    Top