Touch Switch using IC 555 Bistable Mode by Manmohan Pal

Touch Switch using IC 555 Bistable Mode by Manmohan Pal

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Touch Switch using IC 555 Bistable Mode by Manmohan Pal
#TouchSwitch #BistableFlipFlop #IC555TouchSwitch

List of Items:

1. IC 555 Timer
2. Resistor 220k x2
3. Resistor 100 Ohm
4. LED
5. 5 Volt Power Supply
6. Touch Plates (or loose wires)
7. 5 volt Relay
8. Transistor BC 547 NPN
9. Diode IN4007

The 555 timer in bistable mode is also known as a flip-flop circuit. A flip-flop circuit alternates between two stable states, in this case the output of electrical current from the output pin. Unlike the monostable mode and astable modes, bistable mode doesn’t need a resistor and capacitor to set the timing of the circuit. In fact there is no timing in this circuit. There are only two stable states (on and off) controlled directly by the trigger pin (2) and Threshold pin(6).

I’ll demonstrate the bistable mode of the 555 timer with an LED and Touch Plate  connected to the trigger pin(2) and Threshold pin (6). touching the trigger pin (2) once will make the LED turn on and stay on. touching the threshold pin (6) will make the LED turn off and stay off.

Circuit Diagram
https://electronics4ubymanmohanpal.blogspot.com/p/blog-page_16.html


Manmohan Pal
Mob. 8989811397
Email- mannmohanpal@gmail.com
Blog: http://electronics4ubymanmohanpal.blogspot.in/p/blog-page_5.html
Youtube Channel: https://www.youtube.com/channel/UCDnhARnHOEIPuNIEp5vPdGQ

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