INTRODUCTION

Hello viewers, in this tutorial we will learn about GHOST DETECTOR CIRCUIT.

GHOST DETECTOR CIRCUIT is nothing but a simple circuit which is also known as CHARGE DETECTOR CIRCUIT. It is used to detect charge and is composed of transistors, resistors, battery and LED.

COMPONENTS REQUIRED

  • 100K Resistor
  • 470Ω Resistor
  • 1MΩ Resistor
  • BC547 Transistor
  • LED
  • 9 Volt Battery
  • Battery Clip
  • Bread Board

TRANSISTOR

Transistor is a semiconductor device which is basically of two types NPN and PNP. In PNP transistor, N-type semiconductor is sandwiched between two P-type semiconductors and in NPN transistor, P-type semiconductor is sandwiched between two N-type semiconductors. Transistors have three legs namely COLLECTOR, BASE and EMITTER.

Here in this circuit we are using a BC547 transistor which is a very commonly used NPN transistor. You can use any type of NPN transistor such as BC548, BC549 etc. Its operation is very simple, whenever a current is applied in its base then the barrier between the collector and the emitter gets decreased and charge starts flowing from collector to emitter as both terminals gets shorted internally.

RESISTOR

Resistor is an electronic device which opposes the flow of current through it. It has two terminals and there is no polarity so it can be operated in both forward and reverse direction. Its value is characterized by its color of 4 bands present on it. Value of resistance is calculated by color coding. Here in our case we are using a 100k, 1M and 470Ω resistor.

LED

LED stands for Light Emitting Diode. It is a normal p-n junction diode which emits light whenever a current is passed through it. It is available in market in many different colors and of different power ratings.

BATTERY

Battery is a voltage source device which stores charge and energy. There are many different types of batteries of different-different types of voltage ratings which are available in the market such as 1.5V, 3.7V, 4V, 6V, 9V, 11.7V, 12V etc. There are different types of batteries such as Lead-Acid battery, Lithium-Ion battery, Li-Po battery etc. Here in our case we are using a 9V battery.

BATTERY CLIP

Battery Clip is used to connect the battery from the circuit to the Bread Board. It has two wires in which Red one is +ve and Black one is –ve.

Bread Board

Bread Board is nothing but a trainer board which provides convenience to the hobbyists. In bread board you can build up any circuit without any soldering. The thing you need is just to plug and play. It has dotted bread like pores in it in which you can insert the legs of your any electronic components such as resistor, transistor, diode etc for the operation.

MECHANISM AND WORKING

Its mechanism is very simple, as it is a ghost detector circuit or say a charge detector circuit so whenever there is a presence of electric field due to a charge or electrostatic charge (as we know every charge creates its own electric field around its surrounding) then it detects that electrostatic field (i.e. charge) and that charge helps the transistor to get activate as it behaves like a base current for that transistor to complete its internal circuit and then after positive supply is being passed through the collector to the emitter of first transistor to the base of the second transistor and that current of first transistor going towards the base of the second transistor completes the internal circuit of the second transistor and hence second transistor gets activated and then current is transferred from collector to emitter of second transistor to the base of third transistor and similarly third transistor also gets activate and LED turns on, which shows that there is some electrostatic charge or electrostatic field around its antenna and if there is no charge then the LED remains off.

CIRCUIT DIAGRAM OF GHOST DETECTOR CIRCUIT

WIRING AND CONNECTION

STEP 1 OF THE MAKING OF THE GHOST DETECTOR CIRCUIT:

Connect battery clip to the Bread Board.

STEP 2 OF THE MAKING OF THE GHOST DETECTOR CIRCUIT:

Plug the all three transistors into the breadboard as shown in the fig.

STEP 3 OF THE MAKING OF THE GHOST DETECTOR CIRCUIT:

 Connect one end of the 1M resistor to the collector of the first transistor and other end to the +ve supply.

STEP 4 OF THE MAKING OF THE GHOST DETECTOR CIRCUIT:

Connect one end of the 100k resistor to the collector of the second transistor and other end to the +ve supply.

STEP 5 OF THE MAKING OF THE GHOST DETECTOR CIRCUIT:

Connect one end of the 470 ohm resistor to the collector of the third transistor and other end to the –ve leg of LED and connect another leg of the LED to the +ve supply.

 

(i.)

(ii.)

STEP 6 OF THE MAKING OF THE GHOST DETECTOR CIRCUIT:

Connect emitter of the first transistor to the base of the second transistor.

STEP 7 OF THE MAKING OF THE GHOST DETECTOR CIRCUIT:

Connect emitter of the second transistor to the base of the third transistor.

STEP 8 OF THE MAKING OF THE GHOST DETECTOR CIRCUIT:

Give -ve supply to the emitter of the third transistor and Connect antenna to the base of the first transistor.

STEP 9 OF THE MAKING OF THE GHOST DETECTOR CIRCUIT: Now it’s ready for the use to detect electrostatic charge and electrostatic field.

Above step is last step if you complected all process carefully you just made a ghost detector now you are ready to find or catch some ghost 😉

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This is Enamul Hassan, an Electrical and Electronics Engineer. I love discovering new things. I share my knowledge in this blog.

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