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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