Now , i am with a short range wireless FM transmitter which can powered through USB. It can take audio signals and transmit it over a short . It's maximum rage is around 100- 150 meters.you can easily listen it over a radio . it's very cheap and easy to build.
Step 1: Fetching Parts
All you need are some common electronic components.
You can buy them at Radio Shack!
1. Transistor BC 548 OR 2N2219a.
2.Capacitors : 1n , 1n , 10p , 10p variable , 1uF electrolytic.
3. Resistors : 2k7 or 2.7 k , 1k , 10k , 10 variable.
4. Inductor : you can make by yourself . 7 turns on 3mm or 6 turns3mm.
5. Battery : 9 volt .
6. PCB you have to make one or use breadboard.
7. Antenna 10 cm long!
8. Nothing else
Step 2: Circuit Diagram
Here is the simple circuit diagram!
Step 3: PCB - LAYOUT
Here is the PCB layout.
In the next PCB the red ones are capacitors , green ones are resistors , brown one is variable resistor , white one is transistor , yellow one is inductor and other holes are for power and input and antenna. TO make this PCB at home you have to follow this link : ""https://www.instructables.com/id/DIY-Printed-circuit-board/"".
Step 4: Finished Product
HERE is the finished product!
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