Transmitter And Receiver Circuit

Transmitter And Receiver Circuit

How to make a simple rf transmitter and receiver project using a few components.Yes it's possible and working smoothly.I will show the proof.

Working

So the transmitter and receiver we are making is two separate circuits.A transmitter and receiver circuit.

Transmitter Circuit

In this section of circuit we are using a single transistor(BD 139) which is a medium power transistor.The figure is shown above on left side of the picture.The Bd139 along with the biased resistor which is a 10 kilo ohms,capacitor 100 pf and inductor and capacitor parallel to 10 ohms resistor will generates a high frequency carrier radio frequency wave.

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The signal output to the antenna is taken from the collector terminal of the transistor.The antenna propagates the signal to the surrounding areas.The reach of the signal is depending upon the antenna length and power given to the circuit.

Note:

* The power supply we are providing to this circuit is a 12 volt/1 ampere.

* I will recommend only to give the specified power

* Use a heat sink to the transistor as the transistor will heat up after some time.

* The antenna length should not be more than 20 CM.The antenna shape should be in a straight long manner(not spiral,round,spring).

Components Used

1. Transistor - BD 139 

2. Resistor    - 22 ohms,10 ohms

3. Inductor - 10 micro henry

4. Capacitor  - 100 pf, 104 pf

Transmitter & Receiver Components Buy Here

Buy BD139 Transistor

Buy Resistor, Resistor & TransistorPack

Buy Ic Lm356/Lm358

Buy 1N34 Radio Diode

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Receiver Circuit

The receiver circuit is the most simplest ever made.It is making use of radio diode rather than any inductor.We are not using any tuning circuit here.The ic used here is a high gain Lm356 amplifier which picks up signals from the 1n34 radio receiver diode and amplifies it to a certain level.

The signal sensitivity/gain can be controlled using a resistor which is feeding to the pin 2 of ic.I use a 56 kilo ohms of resistor.

The output of the Lm356 amplifier is too weak to drive an output like LED or any other audio devices.So the signal is fed to an NPN amplifier transistor BC547, which can drive any loads like LED,relay,buzzer etc.

Note :

* The power supply used is only 3 volt DC.

* If the LED output works continuously change gain resistor(56 kilo ohms)to large value like 100 kilo ohms.

Components Used

1. Radio Diode - 1n 34

2. Ic                   - Lm 356

3. Resistor        - 56 kilo ohms, 1 kilo ohms, 100 ohms

4. Transistor     - BC 547

Circuit Diagram📢

Transmitter Circuit

Transmitter And Receiver Circuit

Transistor   - BD139

R1                 - 22 ohms

R2                 - 10 micro henry

R3                 - 10 kilo ohms

C1                 - 10 pf

C2                 - 104 pf

C3                 - 100 pf

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Receiver Circuit

Transmitter And Receiver Circuit

Comment below if the circuit is helpful or not working.Also tell me what circuit is needed.

IC         - Lm358

R1       - 56 kilo ohms,gain control adjust

R2       - 22 ohms

R3       - 100 ohms

D1,D2 - 1n34 Radio Diode

T1       - BC 547

Antenna - 20 CM long wire

For Amazing & Simple Electronic Projects 

Here is another Radio Transmitter Receiver Project which i build differently using inductor coil which boosted the range drastically...

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Full Project Video On Breadboard

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