Simple One Transistor FM Transmitter Circuit Diagram

Using one BF494 transistors we can easily build an FM transmitter circuit with the minimum range. Which is the most simple FM transmitter you can never find this circuit is really cool and cheap to assembly? The FM transmitter runs in 3-volt battery and we need to circulate properly to get work well. The simple one transistor FM transmitter consists of one transistor 3 capacitor two resistors. Lets we start building a one transistor FM transmitter.

The circuit having the RF oscillator of NPN transistor BF494. The 56 PF capacitor 36 SWG copper wire coil make the tank circuit. And also show the signal modulation. The modulated frequency that radiated through the antenna.

Circuit diagram

Coil L1 Winding

The coil has to be made by yourself you need to take 36 SWG copper wire and 2.5 tens on 5 mm diameter ferrite rod.

Components Required

• BF494 transistor
• 10k resistor
• 100K resistor
• 104 PF ceramic capacitor
• 56 PF ceramic capacitor
• 47 PF ceramic capacitor
• 36 SWG copper winding with the 2.5 mm diameter

Providing input from the audio source of computer mobile is the biased base of the transistor. The transistor gives an RF signal coming according to the audio input and the FM signals are prepared by the external antenna and tank circuit.

Keep in mind that this kind of FM transmitter circuit is allowed only for the educational purpose the commercial use of this kind of circuits without the permission is illegal in almost everywhere in the world.

Keep in mind about the illegal use and punishment

You can also check the 3 transistors simple FM transmitter circuit diagram using BC547 transistor.

The battery you can use two 1.5 volt AA type of battery. you can easily get these components in the nearest electronic shops the total cost of this circuit is around $1