Touch Switch With Lm555

The Touch Switch circuit will detect stray voltages produced by mains voltages and electrostatic build-up in a room. Two touch plates are provided and the resistance of your finger changes the voltage on pin 2 or 6 to toggle the 555.

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Step 1: Schematic Diagram and Needed Items

Needed items

• 2x Resistors = 3.3 MOhm
• 1x Resistors = 330-470 Ohm
• 1x Capacitor = 10 nF
• 4x Cooper Coins for touch plate
• 1x Led
• LM555
• 1x BreadBoard
• 1x Some wires
• Power Supply +12Volt

Step 2: Needed Tools

Needed tools

• Iron Soldering
• Third Hand Soldering Solder Iron Stand
• Wire Stripper

Step 3: Solder the Copper Coins and Create the Circuit

Solder the four copper coins for using touch plate and create the circuit as you see in schematic diagram.

Step 4: Last Steps

We place the copper coins in the circuit. Feed the circuit with 12 volts and finaly Touch the coins for on-off the LED.

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