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      Make FM transmitter by using Transistor transistor - bc547 Resistance - 4.7K ohm, 100 ohm .                                    Capacitor - 33PF, 47PF/6.8PF, 1nF. Inductor coil - 0.1 mH. Condenser mic Use battery 3.7V DC Power supply   :-  Using power supply stable DC voltage 3.7V max. You can only use battery because battery is perfect for this circuit battery output doesn't any noise. Components  :-  Transistor BC547, Resistance 100 ohms, 4.7K ohms. Capacitor 1nF, 6.8pF, 33pF. Inductor 1uH. Condenser mic any. Resistance  :-   Using resistance 100 ohme +-5% changing 1/3watt, 4.7K ohms +-5% changing 1/3watt. Capacitor  :-   1nF this capacitor number 102 non-polar, 33pF this capacitor number 33 non-polar, 6.8pF this capacitor number 6.8 non-polar. Inductor  :-   This part important part for any transmitter circuit, 1uH 5Turn 24SWG. Transistor  :-   BC547  is an NPN Bipolar junction transistor. It is commonly  used  to amplify current.

The 555 timer IC is an integrated circuit used in a variety of timer, pulse generation, and oscillator applications. The 555 can be used to provide time delays, as an oscillator, and as a flip-flop element. Derivatives provide two or four timing circuits in one package.

                  Inverter circuit diagram

Inverter circuit

Network Booster Circuit Network Receiver Circuit   Amplifier Circuit Network Transmitter circuit

Make a mini robot Use resistance - 10K ohms Use variable resistance -10K ohms Use switch - puss on Arduino nano 2.0