Touch-relay-switch | Electronic Project Circuits

Posts Tagged ‘touch-relay-switch’

100 Seconds Duration On Switch with Touch Control by 555

This is a touch control switch which keeps the circuit on about 100 seconds after touching the plate connected to the 2 numbered pin. At the end of this time duration, relay releases and the circuit gets to off position.

The impedance of the trigger input of the 555 timer IC is very high and the inductive voltage on the human body is enough to trigger it. The circuit works based on this principle. You can use a piece of metal as a plate. The circuit can be used in toy circuits, buzzers or any project that is suitable. You can adjust the duration time by changing the R1 and C1 values.

Touch Switch ON-OFF by IC 555

The modern mechanic switches are improved concerning of old technology. We need however many times to replacement some old switch or to check currents bigger than the durability of certain switches or simple we need something with modern appearance. For he and different reasons is essential the up circuit. He is simple in the manufacture and the materials that use they exist everywhere. This based in the known 555, which drives a relay of which the contacts play the role of switch. The metal surfaces can have what form we want, but it should they are clean and near in the circuit. In order to it changes situation it suffices touch soft somebody from the two plates. Plate JF1 in order to the contacts of RL1 close [ON] or plate JF2 in order to the contacts of RL1 open [OFF]. The current that RL1 will check depended from his contacts. The Led D2 turns on when the switch they are in place ON and the contacts of RL1 closed.

Part List
R1-2=3.3M 1/4W 5% D1=1N4148 RL1=12V Relay [Your choise ]
R3=10K 1/4W 5% D2= Red LED 3 or 5mm. JF1-2=Metal Plate
R4=1K 1/4W 5% Q1=BC547
C1=10nF 63V MKT 5% IC1=555

Source: http://users.otenet.gr/~athsam/touch_switch_on_off.htm
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Categories: Electronic Control Tags: 555 control switch, circuit switches, touch-relay-switch

Capacitive Sensor(Touch switch relay) with BC337

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!

Parts:
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____Aluminium 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

Please read more at the original source: http://www.redcircuits.com//Page22.htm
Thank you.