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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

Fm transmitter circuit Power supply   :-   Using power supply stable DC voltage 2 V to 3.7 V max. You can only use battery because battery is perfect for this circuit battery output doesn't any noise. Components  :- Transistor BC 547 , Resistance 100 ohm , 4.7 K ohm .   Capacitor 1nF, 47pF, 22pF.   Inductor 1uH. Condenser mic any . Resistance  :-   Using resistance 100 ohm +-5% changing 1/3 watt, 4.7 K ohm +-5% changing 1/3 watt. Capacitor  :-   1nF this capacitor number 102 non-polar, 22pF this capacitor number 22 non-polar, 47pF this capacitor number 47 non-polar. Inductor  :-   This part important part for any transmitter circuit, 1uH 5Turn 24SWG. Transistor  :-   BC 547  is an NPN Bipolar junction transistor. It is commonly  used  to amplify current. A small current at its base controls a larger current at collector & emitter terminals.  It has a transition  frequency range  up to 100 MHz . When using the transistor as a switch, the max cur