Capacitive Sensor Circuit Diagram

Special design for shop-windows animation, Useful for many types of touch controls

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,
small 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.


Circuit diagram


R1,R2_____1M 1/4W Resistors
R3,R4_____47K 1/4W Resistors
C1_______10µF 25V Electrolytic Capacitor
C2_______470pF 630V Ceramic or Polyester Capacitor
D1-D3____1N4002 100V 1A Diodes
Q1-Q3____BC337 45V 800mA NPN Transistors
RL1______Relay with SPDT 2A @ 220V switch
Coil Voltage 12V. Coil resistance 200-300 Ohm
J1________Two ways output socket
Sensor____Aluminum or copper thin sheet with the dimensions of a post-card,
glued at the rear of the same (about 15×10.5 cm.)
Thin screened cable


For proper operation, circuit ground must be connected via a small
value, high voltage-rating capacitor to one side of the mains supply
socket. The “Live” side is the right one.


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