Can a transistor be used as a detector?
The cited devices have the operating principle well known, however the bipolar junction transistor (BJT) is not a typical device used as a detector for measuring some physical quantities for diagnostic radiation.
How do you make a simple metal detector circuit?
This simple circuit consists of the following parts;
- Resistor – 3.3 k ohm – 1 nos.
- Resistor – 2.2k ohm – 1 nos.
- Resistir – 68ohm – 1 nos.
- Capacitor – 10uF/16V – 1 nos.
- Capacitor – 10pF – 1 nos.
- Capacitor – 100pF – 1 nos.
- Battery – 6V.
- NPN transistor – BC548 – 1 nos.
How does metal detector circuit work?
When the LC circuit detects any resonating frequency from any metal which is near to it, electric field will be created which will lead to induces current in the coil and changes in the signal flow through the coil. When the metal is detected, the LC circuit will have changed signal.
What does a transistor output do in a sensor?
The outputs of some sensors will behave like transistors, when a sensor senses an object it will trigger the transistor controlling the output (which essentially acts like a switch) and depending on its design it’ll act as an NPN or PNP type transistor. An NPN output is commonly called a “sinking” output.
What is the price of metal detector?
Questions & Answers on Underground Metal Detector
| Range | Min Price | Max Price |
|---|---|---|
| 2 meter | Rs 18950/Piece | Rs 74999/Piece |
| >10 meter | Rs 235000/Piece | Rs 950000/Piece |
What is the principle of metal detector?
The operation of metal detectors is based upon the principles of electromagnetic induction. Metal detectors contain one or more inductor coils that are used to interact with metallic elements on the ground.
What kind of transistor for a metal detector?
In this project, we are going to build a simple metal detector circuit using a BC548 transistor. Metal detectors generally come in one of three types: very low frequency (VLF), beat-frequency oscillation (BFO), and pulse induction (PI).
Can a circuit be used for a metal detector?
This simple metal detector circuit can also be used to detect buried cable or concealed wiring. You can also checkout metal detector using arduino. This metal detector circuit is designed using three NPN transistors, IF transformer, search coil and few passive component.
How does a transistor switch on and off?
The capacitor 1nF between the collector and the emitter affects the voltage on the emitter consequently switches the transistor on / off. It does this by continuously checking the voltage on the tuned circuit and passing the change to the transmitter.
What kind of capacitor is used in metal detector?
Capacitor C 4 is use as coupling capacitor and couples these two oscillators. When any metal is taken near to metal detector circuit a beat frequency of 3 KHz is produced which is amplified by using transistor T 3 and a loud sound is heard through headphone.