Static Charge Detector
Whenever an electrostatic charge material is touched on the antenna, a signal is produced and it is detected. The LED glows when an electrostatic charge material is touched on the antenna wire.Requirements:
BC547 Transistor (BJT) - 3 Pcs
Resistors
- 1 MegaOhm Resistor - 1 ( Colour code - Brown Black Green)
- 100 kiloOhm Resistor - 1 ( Colour code - Brown Black Yellow)
- 100 Ohm Resistor -1 ( Colour code - Brown Black Brown)
Battery 9 Volts - 1
Thin Connecting wires - 100 cm length
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| Fig 1. Circuit diagram |
The terminal with an arrow in the transistor is Emitter. The arrow outward represents, it is NPN transistor. Keep the flat side of the transistor on the right-hand side, then the top pin is Emitter, the middle pin is base and bottom pin is the collector.
In LED, the pin which is larger is P-type. Or inside the glass of the LED, the metal which is smaller is the P-type.
The resistance can be measured by colour coding or by a multimeter.
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| Fig 2. Working condition of the project |
The antenna is made with a simple wire. The wire can be straight or made in coil (spring) form.
When anything that has a static charge on it, is touched on antenna wire, then the LED will glow. or if the buzzer is used in place of LED then it will make a sound.
The static charge is present on our fingers, hairs, any normal wire etc.
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| Fig 3. Connection of the circuit on a breadboard |