Free Electronic Circuits,Schematic Diagram,Circuit Diagrams

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Free Electronic Circuits,Schematic Diagram,Circuit Diagrams

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Electronic Circuit,Schematic Diagram,Circuit Diagrams

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Tuesday, April 22, 2014

Simple Solar Charger Circuit Diagram

I suppose this circuit is a very useful circuit diagram for you all.Because this circuit shows how to connect a Solar panel with a circuit and a battery.You have to use a battery according to the power of the solar panel.here I have used 1N5817 diode to protect the panel and to control the power of the circuit diagram.Keep it in your memory If the two connections of the solar panel touched together it will damage your panel.



Note 

 # Don't connect your panel to the circuit with out diodes 
 # Build this circuit on a PCB

Simple Tracker circuit Diagram

Most of the guys asked about tracking circuits so today I'm going to give you a tracking circuit diagram.The special thing of this circuit is you can get the signals of this circuit through a normal radio.This circuit can signals 200M to 400M.According to the environment distance can be changed.And another special thing is you can operate this tracker circuit with 3V power.Here I have used BC557 and BC 547 transistors.














Note:

# Build this circuit on a PCB 
# Don't supply over 3V 
# Use H antenna to receive signals

Thursday, February 13, 2014

Antenna Amplifier Circuit Diagram

This is an Amplifier circuit diagram We can use this circuit to amplify AM,FM,SW radio waves.Here I have used MPF 102 transistor circuit but If you are unable to find it you can use 2N4406.When you build this circuit diagram build this circuit in a small PCB  you can get  clear radio signals.








Note:

# Build this circuit on a PCB 
# Supply only 9V

Thursday, February 6, 2014

Music bell circuit with UM66

This is a very useful circuit because we can use this circuit to generate different music sounds by using UM66 .This circuit operates with 3V power supply.We have given you UM66 circuit diagrams before.In this circuit we have used different parts.Because we got to know some electronic parts are not available in some counties




Note

 # Don't supply over 3V 
 # Build this circuit on a PCB

Friday, January 31, 2014

Symbols used in Circuit Diagrams

Most of electronic circuit lovers asked about electronic symbols.So today I'm going to give you useful electronic symbols.I got these things from my electronic book called 100 electronic circuit.I suppose this will be useful for you.



Thursday, January 30, 2014

Simple IR Signal Detector


This is a very useful circuit diagram.We all know we can't see IR signals with our normal eye.So that when our remote controllers are not working it is difficult to check whether our  remote controller is working or not .So I think this circuit will help you to detect IR signals





Note

# Now we can see IR signals with a digital camera or your mobile cam

# Build this circuit on a PCB

# Don't supply over 9V


Monday, January 27, 2014

Simple Multivibrator Circuit Diagram





This is a simple multivibrator circuit.This circuit can be operated with 9V power supply.Most of guys asked  9V multivibrator because they wanted to attach a multivibrator circuit for their bicycles.I suppose now you all will be able to attach this circuit for your bicycle.





 

Note:

 # Build this circuit on a PCB
 # Don't supply power over the limit
 # use two color LEDS

Thursday, November 21, 2013

Simple IR transmitter and a receiver


This is a very useful circuit for the people who have cars and vans because this circuit operates with 12V.Operating frequency of this circuit is 160 Hz.And you can send signals about 2M-5M or 2M-15M it depends on the audio transformer which you use.by tuning 100K you can get the maximum distance






# Use common audio transformer

# Build this circuit on a PCB

# Be patient and tune carefully

# don't supply over 12V

Friday, November 8, 2013

Simple 100M VHF video Transmitter

I think most of you like to make transmitters today I'm going to give you a video transmitter.The special thing of this transmitter is you can operate this circuit with 9V power supply and you can send signals about 100M.I have used this circuits for my security camera system it's working well and also when we do a concert or a musical show we need to send live videos to a big screen or a projector normally video transmitters are quite expensive but you can build this circuit with less than $10 Here I used Bc 108 Transistor If you are unable to find Bc108 you can use similar Transistors like BC337, BC546 , 2N2222












Note


# Build this circuit on a PCB
# without connecting an antenna don't give the power to the circuit
# Build this circuit in a little space

Wednesday, November 6, 2013

Free power from the telephone line

I think this circuit will be very useful for you all to get some electricity when you are in a power cut.You can get  power to light up several LED bulbs. I suppose Even a LED is very valuable when you are in the dark.after building this circuit connect your circuit to the telephone line through red and green wires. to get power connect your cables to + and _ lines.



 This is only for educational purpose.Free circuit diagrams 4U team doesn't get any responsibility of  misusing this circuit.

# Build this circuit on a PCB

Tuesday, October 29, 2013

Very simple FM Transmitter Bug



Most of viewers asked about FM transmitter circuit today I'm going to give you very small and some what powerful FM transmitter.The special thing of this circuit is we can operate this circuit with 3V.Here you can use BF414 / BF324 / BF606 transistor.





Sunday, October 27, 2013

Simple Christmas Star Circuit diagram



This is a simple Christmas Star circuit diagram.Here I have used common transistors.You can operate this circuit with 3-9 V.And another special thing is there are 18 LED s of this circuit so This circuit will give a wonderful look for your Christmas tree.



Notice 

 # Don't give over 9V
 # To get best result build this on a PCB

Wednesday, October 16, 2013

230V LED LIght


Today I'm going to give you a very useful circuit diagram.At present we can see many people are burning from electricity matters because at present many people have to pay a big electricity bill.I think if you can build up this circuit you can reduce your bill.












Notice


This is not suitable for the children

Be careful when you deal with 230V

Monday, September 2, 2013

Pulse moter circuit diagram

This is a simple pulse motor circuit diagram.you can use this circuit to power up pulse moters.Here I have used very common IC NE555 you can control the speed of the mortar by adjusting When you use this circuit don't supply over 12V.  





Note:-

Build this circuit on a PCB

Sunday, August 25, 2013

parallel and series circuit diagrams


Some viewers hadn't clear idea about parallel and series circuits.Here you can see  we can  build a  circuit in two ways they are parallel and series.If I explain simply when you use series circuit it will reduce the light of the bulb according to the number of bulbs  but when you use parallel circuit diagram it will not reduce the light of the bulb but it will drain your battery speedly 
 


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