LED Circuit

Free circuit diagrams 4U has given you many  LED circuits before.By using this circuit you can light up a LED with 9V.This is too simple circuit .So the kids also can try this circuit

Simple radio circuit Diagram

Already  Free Circuit Diagrams 4u has given you many radio circuit diagrams this is also a simple radio circuit.You don't want to supply extra power for this circuit this circuit is powered up with radio signals.The parts are mentioned bellow


 D1: 1N34 germanium diode
J1: 1/4-inch, 2-conductor headphone jack   
 C1: 1000 pF mica or disc ceramic trimmer
C2: 40 to 500 pF trimmer capacitor
C3: 365 pF variable capacitor
L1: 35 feet of 22-gauge enamel wire.

#  Note:    Try to test this circuit doing changes for the coil then you can get best result 

                 We would like to remind you that Free circuit diagrams 4u has  free, electronic circuit, circuit diagram, circuit schematic, schematic diagram, electronic diagram, audio, amplifier, power supply, guitar effect, current loop, current limiter, video, receiver, transmitter and many more circuit diagrams

One LED with 9V Power

Hi every one you all know Free circuit Diagrams 4U always give you easy and simple circuit diagrams so today we are going to give you a special circuit diagram.By using this circuit diagram you can light up a LED with 9V

Symbols of Circuits

Some new comers for the electronic field have sent emails for FREE CIRCUIT DIAGRAMS 4U asking the symbols  of the electronic circuits.I must say that already we have given you some circuit symbols and these symbols also will be useful for you.Because sometimes the symbols are changed circuit to circuit the reason is there are many similar symbols.So I hope this will be useful

1W LED Driver Circuit Diagram

At present most of people use LED light systems.Because LEDs can save our electricity on the other hand we can see LEDs have good life time.So that most of factories use LEDs  to make light circuits.Today Free Circuit Diagrams 4U is going to give you a simple LED driver circuit diagram.This can give a smooth current to your LED this can drive 1W LED.

Note: 
         # Build this circuit on a PCB

230V LED tube light Circuit Diagram

Hi every body Free Circuit Diagrams 4u is giving wonderful and very simple circuit diagrams so today I'm going to give you 230V tube light circuit diagram at present we can see we all have to fight with electricity bill but you know if you can connect LED lights to your house you will be able to reduce your electricity bill.But we all know LED light systems are little bit expensive.So I suppose this circuit will be a bet answer for your matter.

Note:
          # If You are an underage guy don't try this circuit Because 230 V is dangerous

Magnatic Power On Off Switch

This is very useful circuit Diagram already Free Circuit Diagrams 4U has given you many useful circuit diagrams.Today We are going to give you a magnetic power on off switch basically this circuit diagram is with robots.By using a magnet you can on and off this circuit.this circuit can be operated with 9V power supply.And also when you make burglar alarms you can use this circuit diagram.

Note:
         # Build this circuit on a PCB
         # Try to make different things by using this circuit diagram

One IC Transmitter Circuit Diagram

Free Circuit Diagrams 4U has given you many transmitter circuit diagrams today I'm going to give you some transmitter circuit with some modifications.This circuit can send signals up to 100 M.Here we have used IC UPC 1651.This circuit can be operated with 6V.The special thing of this circuit is we can build this circuit with one IC.

Note : 

# Build this circuit with 6V power supply 
# Build this circuit on a PCB

Simple Sound Sensitive Circuit Diagram

At present we can see many light systems in parties in clubs or in various types of vehicles.Among them light sensitive circuits get a special place Because most of people use light sensitive circuit diagrams to colorful their parties.At present most of guys use these types of circuits to give a different attraction for their sound systems of their vehicles.Already free circuit diagrams 4U has given you various types of sound sensitive circuit diagrams but this circuit is different from them because this circuit has only one transistor.it is Tip 120 and you can run this circuit with 9Vpower supply.After making this circuit you will be able to see the LEDs are working according to the sound.

Note:
         # Build this circuit on a PCB 
         # Give 9V power for the circuit

Simple IR circuit Diagram circuit (230/110V)

Free circuit Diagrams 4U always give you new circuit diagrams .So today we are going to give you IR Remote control circuit diagram.The main part of this circuit is CD4017.This circuit can be operated with 5V. Tosp 1738 is used to get IR signals.And another important thing is you can connect any Electronic equipment Via load.( To the relay)

Simple moter speed Cntroller circuit Diagram

This is a simple motor control circuit diagram.Free Circuit Diagrams 4U has given you speed controllers before this but the specialty of this circuit is  this circuit can be operated with 3V.Here I have used Bc557 and Bc338 transistors.I suppose this would be a very useful circuit for you all 

Simple AM/FM/SW/MW booster Circuit

Today Free Circuit Diagrams 4U is going to give you a very useful circuit diagram in some countries we can see some radio signals are poor so this is the best answer .Here We have used very common Transistor MPF102 use470uH Coil for short wave and use20uH for L1.You can run this circuit with 9V

Simple Music Generator with UM66

Hi every one Free circuit diagrams 4U always try to give you useful and simple circuit diagrams.Already we have given you many circuit diagrams with UM 66 Ic But through this circuit diagram you can get a good sound.Here We have used Bc 148 transistor and you can operated this circuit diagram with 3V

Crystal Radio circuit Diagram

This is a very joyful circuit diagram because after building this circuit you can listen to radio channels through your own radio.The special thing of this circuit is this circuit doesn't need external power.That means this circuit gets the power from radio signals.When you wind the coil do it with patient.

Simple Transmitter Circuit Diagram

Today Free Circuit Diagrams 4U is going to give you a simple Transmitter circuit.This circuit runs with NE555 IC.We can operate this circuit diagram with 9V power supply.before supplying power don't forget to fix a wire for the antenna ( about 30 inches)

Note: 
            # Build this circuit on aPCB
           # Don't supply over 9V

12V Police Flashing Light Circuit

This circuit is a very famous circuit diagram among the electronic circuit lovers.Today Free circuit Diagrams 4U is going to give you a Famous police flashing LED circuit diagram.In this circuit  we have used common IC NE555.The special thing of this circuit is this circuit can be operated with 12v power.So you can directly attach this circuit with your car or truck.When you select the colors of LED's choose red and blue

Single Transistor Transmitter Circuit Diagram

We all like to make transmitters.Most of guys sent emails to Free Circuit Diagrams 4U asking simple transmitter circuit diagrams .I suppose this would be the best answer for that.The special thing of this circuit is this circuit runs with one transistor.This circuit can be operated with 3V power supply.Here we have used 2N2222 transistor. you can make the coil winding 5 turns of 24AWG wire on a 1cm plastic former.You can send signals up to 5oM in open space.

One IC Led Flasher circuit Diagram

Most of people always send emails to Free Circuit Diagrams 4U asking simple Circuit diagrams. Here I'm going to give you a very simple flasher circuit diagram the specialty of this circuit is we can operate this circuit with 1.5 V power supply.And we have used only one IC for this circuit that means you need to buy only three parts to build up this circuit.Here we have used common IC3909.

Two way Switches Circuit Diagram

Most of people sent emails to Free Circuit Diagrams 4u  asking  a circuit diagram to switch on and off one bulb with two switches.So this is the circuit which you asked.Most of the people in the world use this circuit with there staircases.Because they want to light up the bulb before climbing the staircase and want to switch off the bulb after climbing the staircase,By using this simple circuit you can do that.When you make this circuit you want Two two way switches.

12V to 230V Inverter Circuit Diagram

At present we can see electricity has become an essential thing with out electricity it is difficult to lead our life.Free circuit Diagrams 4u always try to give you useful things.So today I'm going to give you an inverter circuit diagram.By using this inverter you can generate 230v AC .Transformer is a network with two 12V secondary windings and must be rated for the maximum load required drive.here we have used MOSFET transistors