Blog Feed: Free circuit diagrams 4U

Hi every one today I'm going to give you a Wonderful LED circuit diagram.This circuit is called Multivibrator circuit diagram.Here two LEDs are blinking one by one.Here I have used common IC CD4069. Note# Build this circuit on a P.C.B# Don't suppl

Police car light system

Published on 2013-01-30 11:28:00

Today I'm going to give you a wonderful circuit diagram.Most of you ask about police car light systems.So I thought to give you a police car light system circuit diagram.Here I have used two ICs one is IN4017 and the other one is

TV remort tester

Published on 2012-12-26 12:31:00

Today I'm going to give you a very useful circuit diagram .It is TV remote tester circuit diagram.Sometimes you are unable to check whether your TV remote is working or not.Not only T.V remote you can check any IR signals.Here I have used very common

Simple Touch Switch

Published on 2012-11-26 11:22:00

This is a simple touch circuit diagram.I think you can use this for many purposes.I have used this circuit as a security circuit device.Here I have used very common Transistors

Long time LED Flasher circuit diagram

Published on 2012-11-02 03:55:00

Today I'm going to going to show you a very wonderful circuit diagram .The special thing of this circuit is this circuit can light up a LED more than the normal time.Sometimes it will light up our LED more than one month.so I suppose this would be a

Simple Doorbell

Published on 2012-10-29 08:49:00

I think at present we can't see a house with out a doorbell.And also people use different types of doorbells.Today I'm going to give you a nice and simple doorbell circuit.Here I have used very common IC UM3481.And another thin is we can get different songs This Ic has the ability to generate more than 16 sounds.Normally we can use 1.5V to 3V to run this circuit.Note:

Simple 555 Timer circuit diagram

Published on 2012-07-30 00:21:00

A lot of guys requested a simple timer circuit so this is the circuit.This circuit runs with main IC NE555. you can change the frequencies of the circuit by changing the values of R1, R2,C .This circuit runs with 4.5V.Note :# Don't supply more than 4.5V# Build this on a PCB

230V Flasher Circuit diagram

Published on 2012-06-25 00:16:00

This circuit operates with 230v.you can use this circuit to decorate your parties.I think this will be a wonderful circuit to you all.This circuit was taken from my old circuit book called 100 circuit book.Here DIAC ER 900 and Triac BTW 11-400.Note:# Be careful when you deal with 230V# Build this circuit on a PCB# Use only mentioned values.

simple coir dust meter

Published on 2012-05-22 03:19:00

Last few days I did some experiment regarding coir dust meters. At that time I could made this simple circuit diagram.Here I have used common Transistor Bc 547. Really this is a water sensitive circuit.We can use this circuit to measure whether coir dust is wet or dry.How to operate:-First of all switch on your multimeter and switch it to measure the voltage next get the handle and pull it in to the sack of coir dust ( That means A and B must go in to the sack) then read the meter.Before statin [..]

230V Led Flasher circuit diagram

Published on 2012-04-23 23:47:00

This is a 230V LED flasher circuit diagram.I thought to give you this circuit because of the on coming Wesak festival.By using this circuit you can flash your LED with 230V.If you want to add more LEDs you can simply add a relay and connect the rest of LEDs via it.I suppose adding a relay is the most easiest way for beginners.# Note1) Build this circuit on a pcb2) Always use the correct values of electronic items.3) THIS CIRCUIT IS NOT SUITABLE FOR CHILDREN IF YOU ARE A CHILD DON'T TEST THIS [..]

Car Reverse Horn

Published on 2012-03-07 22:55:00

Most of people have there own vehicles.so I suppose this circuit will be very useful circuit for them.This circuit is a car reverse horn.If you can build your own circuit for your car I think that is great.Here I have used common Music generator IC UM 66.The out put voltage of UM66 is not enough to make a good car reverse horn so by using two transistors (BC148 and BEL187)I have increased it.Note# This circuit operates with 12V power supply# Build this circuit on a PCB to get good results# us [..]

TV Transmitter circuit diagram (VHF)

Published on 2012-01-22 01:29:00

Most of people ask TV transmitters.So Today I'm going to give you a very useful circuit diagram.By using this circuit you can send your signals 75m to 100m.This circuit diagram is not my own circuit one of my friends gave me this.I suppose you guys also can send your own circuit diagrams for us.Then we can publish them through our website.Here They have used common transistor BC 108 If you are unable to find this transistor you can use equal transistors like BC337, 2N2222, BC546.Note# To make L [..]

Burglar alarm

Published on 2012-01-02 11:25:00

This is a very useful circuit diagram because these days there are lots of crimes in every where.So I suppose this would be an answer for your matter.Here I have used common Transistor BC107.After fixing this circuit switch on s1 and adjust R2 until the horn makes sound.Then switch off the s1 .Now if some one broke the thin wire the horn will make a sound.You can cover your garden with this circuitNote# Build this circuit on a PCB#Don't supply more than 12V# Use very thin wire to get good resul [..]

Basic Sound Generator Circuit Diagram

Published on 2011-10-18 00:17:00

This is so important circuit for the persons who came to this field recently.Here I have used common IC NE555.According to the pules (Frequency) of the IC We can generate the sound.You can change the speed of the sound by adjusting R2.This circuit operates with 5V.# Note# Don't give over 5V# Build this circuit on a PCB# Don't give the much heat to the IC NE555

Three sirens in one Circuit

Published on 2011-09-29 23:58:00

This is a siren circuit diagram Here I have used UM3561 circuit diagram.This circuit can be operated with 3V.It can generate 3 sirens.Here I have used IC 2SC9013 you can use the same IC or similar IC. Use 8ohm 0.2W speaker.Note:-* Don't use more than 3V* Don't use this for unnecessary things* Build this circuit on a PCB

230V LED

Published on 2011-07-25 23:58:00

Most of you asked about 230V LED circuit diagrams.Today I'm going to introduce you that circuit.I have attached this circuit for my door bell.So that at night I can easily see it.Not only that people can us this circuit to see whether electricity is there or not So use thi9s circuit and get fun....# Note# you should be careful when you use this circuit.Because this circuit operates with 230V# This circuit is not suitable for kids# When you use electronic parts those parts should have correct val [..]

Simple radio circit diagram

Published on 2011-05-14 00:36:00

some persons asked simple radio circuit diagrams.Here you can see very simple circuit diagram.When I tested this my first time I enjoyed very much.When the signals are coming you can here some sounds like ne ne nee nic nee nee nee nee.so test this an

Simple radio circit diagram

Published on 2011-05-14 00:36:00

Simple Toy Orgen

Published on 2011-04-14 03:36:00

This is a toy orgen circuit diagram here I have used very common IC NE555.If you like to generate different sounds you can attach capacitors with different values.according to the value of the capacitor you can change the sound according to your wish

Simple Toy Orgen

Published on 2011-04-14 03:36:00

Smoke sensitive circuit diagram

Published on 2011-04-02 00:22:00

Here I am going to introduce you a very important circuit.It is nothing but a smoke sensitive circuit .In the market we can see there are lots of expensive smoke sensitive kits.But I'm going to give you a very simple method to make a smoke detector.H

Smoke sensitive circuit diagram

Published on 2011-04-02 00:22:00

Water sensitive circuit diagram

Published on 2011-02-23 23:12:00

This is a water sensitive circuit diagram.I suppose this circuit will give you lots of benefits .I have modified this circuit up to some extent and have added to our water pump moter (230 v) I think you also can use this circuit for various purposes.

Water sensitive circuit diagram

Published on 2011-02-23 23:12:00

Touch sensitive circuit diagram

Published on 2011-02-17 08:30:00

Here I have design a touch sensitive circuit diagram.For this circuit I have used a common transistor BC 547.Normally this circuit can be operated with 4.5 to 6 v.I suppose you will be able to do lots of things with this.I have used this circuit for

Touch sensitive circuit diagram

Published on 2011-02-17 08:30:00

Simple Flaher Circuit Diagram (24V)

Published on 2010-12-27 23:32:00

This is a simple flasher circuit diagram.Some people can't use normal circuit diagrams due to 24V batteries of there Vehicles.Here I Have introduced 24V circuit diagram for you all.Here I have used simple circuit diagram.It is multivibrator circuit

Simple Flaher Circuit Diagram (24V)

Published on 2010-12-27 23:32:00

Blinking LED Circuit Diagram

Published on 2010-12-26 10:32:00

This is a blinking LED circuit diagram.Here I have used common IC NE555.If you want to change the speed of this circuit you can change the value of R2.Then you can do that.Note* Use a PCB to build this circuit* You can operate this circuit with 9V

Blinking LED Circuit Diagram

Published on 2010-12-26 10:32:00

Simple Christmas star from multivibrator Circuit Diagram

Published on 2010-12-01 09:04:00

This is so simple circuit But you can use this circuit as a Christmas star.Here I have used famous transistor 2N3904.If you are unable to find this transistor you can use D400 instead of that.This circuit operates with 9V.I used this circuit for the

Simple Christmas star from multivibrator Circuit Diagram

Published on 2010-12-01 09:04:00

Flashing Neon Circuit diagram

Published on 2010-11-07 10:45:00

This circuit will be a fantastic circuit for Vehicle lovers Because this circuit can up grade the out look of your Vehicle. This circuit is nothing but a Flashing Neon circuit diagram.This circuit can be operated with 90V.You can change the frequency

Flashing Neon Circuit diagram

Published on 2010-11-07 10:45:00

12V to 120V Inverter circuit diagram

Published on 2010-10-24 03:05:00

Most of members asked about 12V to 120 inverter circuit diagram.As they mentioned they need to operate 120V applicants with 12V car battery.So this circuit will be the answer for that.Note# T1 should be 15A# parts that we have mentioned here can only

12V to 120V Inverter circuit diagram

Published on 2010-10-24 03:05:00

Light Operated Rellay Circuit diagram

Published on 2010-10-03 23:11:00

This is light operated circuit diagram.Wonderful thing is this circuit can be operated with 9V power supply.You can attach this circuit for your vehicle even.I have used this circuit for my car as an automatic dim switch.This circuit operates with BC

Light Operated Rellay Circuit diagram

Published on 2010-10-03 23:11:00

Fluorescent Tube Light Driver Circuit Diagram(10W)

Published on 2010-10-03 02:28:00

This is very useful circuit for us.Because we can light up 10W Fluorescent lamp by using this circuit diagram.This circuit operates with single transformer.I suppose now you can enjoy this inverter.When you wind the transformer do it carefully becaus

Fluorescent Tube Light Driver Circuit Diagram(10W)

Published on 2010-10-03 02:28:00

LED FLASHER ( About 1Year )

Published on 2010-08-31 02:19:00

This is so useful circuit diagram for you Because this circuit can light up an LED about 1 year with 9V battery.Here I have used famous IC HEF 4093.Note# Use a white colour LED# Build this on a PCB to get maximum result# Use 9V battery to power this

LED FLASHER ( About 1Year )

Published on 2010-08-31 02:19:00

9V (2A) power supply circuit diagram

Published on 2010-08-20 01:10:00

Lots of members asked about 9V dc power supply with 2A.So here We have introduce a new circuit diagram.This circuit can provide 9V 2A.I suppose now you all have some what good power supply with some what good amp level.This circuit operates with fa

9V (2A) power supply circuit diagram

Published on 2010-08-20 01:10:00

Ding Dong Bell circuit diagram

Published on 2010-08-05 04:09:00

This is a ding dong bell circuit diagram.I have attached this circuit for my house.Even you can use this circuit as an sound generator.When we buy this circuit from the market we have to spend much money but now you can build this your self.Here I ha

Ding Dong Bell circuit diagram

Published on 2010-08-05 04:09:00

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