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  First of all I must say that we give this circuit with the educational purpose If you missed used this circuit we don't get the responsibility of it.Most of the viewers sent us emails asking RF circuits like this.Here we have used common transistor 2N918.To make L1 wind 2 turns of 22 AWG magnetic wire on a 5/32 steel bolt  #  This circuit Can be operated with 9V  #  Build this circuit on a PCB

CD 4017 is a very famous IC .in 1980s Through knight rider teledrama most of people wanted to make the knight rider circuit diagram.Not only that by using this data sheet you can create new circuit diagrams.I suppose this will be a useful sourse for the guys who asked the data sheet of CD 4017

This is a simple and enjoyable circuit diagram.Already free circuit diagrams 4U has given you many music bells.to build up this circuit we have used only on IC it is LM386 and you can run this circuit with 5V Note:          Build this circuit on a pcb          Use 8Ohm speaker for this

Today we are going to give you a very famous circuit diagram.Here we have used common Transistor BC 547.This circuit can be operated with 6V power supply So that this is a very famous circuit diagram among motor cycle owners. Note : #  Build this circuit on a pcb           #  Don't supply over 6V

This is a simple electric shock gun.You all know free circuit diagrams 4U always try to give useful and funny circuit diagrams .This circuit is not too powerful one so you can get fun with it.Here we have used audio transformer.This circuit can be operated with 3V Note:       #   Don't play with this with small children.       # Though this circuit is harmless free circuit diagrams 4u doesn't take any responsibility of misusing this             circuit.We have given this with educational purpose only

This is a very useful and simple circuit diagram we can use this circuit for different uses.this circuit is sensitive for water so when the touch pads touch water it will light up the LED.Removing the LED you can use a relay    Note:              Build this circuit on a pcp

This is a simple motor control circuit diagram.This circuit can be operated with 12v.So you can fix this circuit to your car or truck to control motors or fans.We must say that already free circuit diagrams 4u has given you motor speed controlling circuit diagrams Note:               Build this circuit on a pcb

This is  a touch sensitive circuit diagram.At present we can see vehicle manufactures have made touch sensitive electronic equipments with their cars.So I suppose this will be a useful circuit for you all guys.This circuit can be operated with 12 V so that you can fix this circuit with your car directly.Use a copper plate as the touch plate. Note:          # Build this circuit on a pcb

This is a very interesting circuit But this is illegal in some countries so first of all we must say that you have to test this with your own risk Free circuit diagrams 4U doesn't take any responsibility of this.Here We have used very common transistor BFR91A and also If you are unable to find above transistor you can use  BFR90, BFR92 or BFR93.The antenna should be 5cm. Note:   # Build this circuit on a pcb   # Build this circuit in a small space  # when you build the circuit don't give over heat to the transistor

Today we are going to give you a LED Flasher Circuit Diagram For kites Because at present most of people like to send kites even at night time.We must say that already free circuit diagrams 4u has given you many LED circuit diagrams.You can build this circuit simply and fix it on your kite.This circuit can be operated with 3V.You can use button cell to power up this circuit.  Note:           # Build this circuit with out a pcb and  using a glue fix it to the kite

This is a very simple Crystal  Radio Circuit Diagram Circuit.Specialty of this circuit is you can build this circuit diagram by using things which are available at your home.This circuit runs with radio signal that means this circuit doesn't want an extra power.Before using your razor burn it.Then it will become blue color And also Connect the pencil's  rod of lead.It is not mentioned in the circuit diagram.Connect the ground wire to the earth line of your house. Note:          Build this circuit on a wood board

 Free Circuit Diagrams 4U has given you many flasher circuits.Today we are going to give you very easy circuit diagram this circuit is operated by NE 555By changing the value of the capacitor you can change the speed of LEDs.This circuit can be operated with 5V Note:           # Supply 5V for this circuit           # Use a base to Ne555