Air flow detector circuit.

admin June 1, 2009 142 Comments

Description.

This circuit can give a visual indication of the rate of air flow.It can be also used to check whether there is air flow in a given space.

The filament of a incandescent bulb is the sensing part of the circuit.When there is no air flow the resistance of the filament will be low.When there is air flow the resistance drops , because the moving air will remove some of the heat generated in the filament.This variations in the resistance will produce variation of voltage across the filament.These variations will be picked up by the opamp (LM339) and the brightness of the LED at its output will be varied proportionally to the airflow.

Circuit diagram with Parts list.

air-flow-detector_circuit.JPG

Notes.

  • The filament L1 can be made by removing  the glass of a 40W incandescent bulb.
  • The circuit can be powered from a 12 V DC power supply.

Comments
  • March 22, 2015

    sir, i want to make air floe detector circuit so please send me the details of it.thanku

  • Areen
    March 9, 2015

    where can we use this circuit ??

  • shobika.
    February 20, 2015

    Sir,
    I need detailed explanation about this circuit. And I want to know that whether output will be there

  • January 22, 2015

    Here in this circuit the o/p voltage range of IC 7850 is exceeding the i/p of LM339. Thats why is’n working properly, we should use a regulator before adding the lm339.

  • Sree
    January 8, 2015

    sir,
    i wish to do this as my mini project ,so please send me a complete report on this project including its advantages, applications ,scope of this in future

  • Yuva Sri
    October 19, 2014

    I need mini project sir for 1st year plz

  • akhilesh
    October 7, 2014

    Sir
    I am using thermistor so I needed exact connection in the circuit while I tried breaking the bulb and by using the tungsten filament and soldering it damaged it. So I needed some alternative way to do this.

  • mano
    September 27, 2014

    pls send the advantage of airflow detector

    • seetharaman
      September 30, 2014

      If you want to detect air flow in air duct you require a an anemometer which is a mechanical instrument wear and tear will be there. Use electronic method it will accurate for a long time.

  • Ravi
    August 23, 2014

    please send sensor mini project. .

  • July 14, 2014

    sir.
    please send the advantages and documentation of this air flow detector project.urgent

  • fahad
    April 1, 2014

    I connected a 6.2v 500ma bulb instead of filament and it is not working…
    when i connected filament it is not getting heated..

    • Seetharaman
      April 2, 2014

      The current source should be capable of supplying 50mA to the filament. around 80 to 100 ohms in value. if your filament resistance is more than 100 ohms this circuit will not work. you have to use portion of the bulb filament instead of full length. use around 50 to 60 ohms of it.

    • Seetharaman
      May 29, 2014

      It should be a bare filament directly in touch with the atmosphere.

  • rahul
    March 10, 2014

    plz send me to all the details of air flow detector

  • kunal
    November 21, 2013

    sir, can you please tell me what can be used as a substitute of filament?
    and is that R4 a variable resistor??

    • Seetharaman
      November 28, 2013

      r4 is a potentiometer and the filament can be replaced with low value PTC resistance(positive temperature coefficient resistance)

  • mallika roy
    November 10, 2013

    sir,
    plz send me report and i need its applications and significance of air flow detector.

  • teja
    November 5, 2013

    plz.send me a documentation of air flow detector usig filament.&also working of each r&c,plz—plz—-

    • shahbaz
      May 28, 2014

      instead of led we can use siren?and send me its rating

  • vish
    November 3, 2013

    Dear Seetharaman, i am doing a project very similar to this. It is like im using a wind flow sensor. Is there any way that you could help me with this please? Thanks in advance

    Best regards
    V

  • October 17, 2013

    Filament replace by ?

  • Saeedsadeeq
    September 20, 2013

    Hi sir i like to give me the history, working, principle operation and construction procedure of an air flow detector

  • rajeevkumar
    June 20, 2013

    sir the result is coming oppositely to ur saying.when air flows through the filament the brightness of bulb is decreasing

  • Seetharaman
    April 28, 2013

    Hi Adnan you have to use low ohmic PTC (33 ohms). LM339 can drive a maximum of 6mA, hence you have to add a transistor to take care of the drive current of the relay.

  • ADNAN
    April 26, 2013

    Hi sir. Can i use any thermistor or air sensor instead of L1 filament?
    if yes, kindly suggest which sensor or thermistor can be used.
    Moreover, can i directly operate the relay at the output pin #2 of LM339?
    Looking for your kind reply.

  • nidhi
    April 24, 2013

    plzzzzz tell me that where it is used

  • duncan
    April 15, 2013

    hi sir, help send me a report on airflow because am interested in doing this project but i have litle knowledge. thank you

    • Seetharaman
      April 16, 2013

      Air flow detector is user to find the adequate air flow in a system. (may be a bower or a cooling fan air flow) Here the positive temperatue coefficient charecterestic of the bulb filament is used for detecting the air flow(the air flow will cool the bulb filament (which is heated by constant current flow through it). Once the air flow decreases the bulb temperature will increase its resistance will increase which will detected and indicated by the LED.
      Reply

      • Anmol
        April 17, 2013

        sir,
        I am making this project in my college and i am required to submit the report but due to lack of adequate information i am unable to make the report. so kindly help me by providing some more information on this topic or your report on this project. Thankyou.

  • Anmol
    April 14, 2013

    Hi Sir, i am doing a project on air flow detector and i have to submit a report on that but i dont have enough information to make the report. So i request you to give some more information about the project or post your own report.It would be of great help for us.Thankyou.

  • Tahsinur Rahman
    March 30, 2013

    Hi,sir i want to know measure the rate of air flow..How i can improve that..pls reply…

  • vivesh
    March 23, 2013

    can you explain npn transistor and how wor

  • J.Hepzibah beulah
    March 15, 2013

    Hai sir, i want to know the complete info that how much amount of air this circuit detects. and added that what is the replacement for filament in this circuit. how can i enhance this circuit in real time applications. ive chosen this as my mini project in this sem . so please send all these informations to my mail soon. thank u very much

  • fad
    March 13, 2013

    name of connection of the resistors…?

  • dips
    March 13, 2013

    what is the function of each resistance and the function of the capacitor?pls help

  • February 28, 2013

    can u give me the detail information about application of air flow detector and where it is mainly used………..? plz give me the answer,im doing mini project on this topic sir……….
    sir,any other circuit is previously used for air flow detection? if its used, can u send circuit diagram and drawback for that circuit sir………….

  • vishwanath kharabe
    February 27, 2013

    fine
    it’s good one &easier

  • nagaraj
    February 26, 2013

    sir,any other circuit is previously used for air flow detection? if its used, can u send circuit diagram and drawback for that circuit sir………….

  • nagaraj
    February 26, 2013

    can u give me the detail information about application of air flow detector and where it is mainly used………..? plz give me the answer,im doing mini project on this topic sir……….

  • February 22, 2013

    air flow

  • gaurav
    February 18, 2013

    sir i would like to know the function of the resistor R4.. is it a potentiometer?

  • sudan
    February 11, 2013

    hi sir.can u give us the information about working principle

    • Seetharaman
      March 16, 2013

      Hi Please go through my 31st October comment

  • Aadil
    February 5, 2013

    Hi sir i wanna work on this project as my miniproject so pls give me an idea about its expenses

    • Engr Adnan
      March 13, 2013

      Salam,, dear Aadil, its very cheap project..About PKR.500..
      If u want to learn, don’t see expenses..or work in group..

    • M.Tayyab latif
      November 28, 2013

      excuse me if you made this project plz send me the full procedure and appratus of air flow detector i also make this plz

  • gaurav
    February 4, 2013

    hello sir,
    i am gaurav, I am studying 3rd yr(Extc).i am doimg my miniproject on dis air flow dedector topic.

    sir i want to know more details about this project.i am very eager to know dis.so please send me more information about (principle,construction,each elements work) to my mail ID..thank u sir….

  • January 30, 2013

    anyone send airflow detector final documentation.

  • Debasis Singha
    December 24, 2012

    Please give me a detail description and corresponding circuit diagram of about— a man or any object when enter into a room light/lights automatically switch on.

  • Aliya
    December 23, 2012

    May i know the practical apps of this??

  • haimobati
    December 22, 2012

    plz send me more detail about this project.

  • PATL UV
    October 26, 2012

    SIR ;
    WHAT IS ADVANTAGE & DISADVANTAGE OF AIR FLOW DETECTOR? HOW IT WORK? PLS REPLY FAST

    • seetharaman
      October 31, 2012

      Air flow detector is user to find the adequate air flow in a system. (may be a bower or a cooling fan air flow) Here the positive temperatue coefficient charecterestic of the bulb filament is used for detecting the air flow(the air flow will cool the bulb filament (which is heated by constant current flow through it). Once the air flow decreases the bulb temperature will increase its resistance will increase which will detected and indicated by the LED.

      • patel uv
        November 5, 2012

        thanx sir thank you very much

  • shwetha
    September 26, 2012

    plz some info about dis….

  • ABHISHEK
    September 20, 2012

    plz send me more detail of this project.

  • Rupa
    September 20, 2012

    How can I connect the filament in the bread board? Plz explain… It;s often getting damaged..

    • seetharaman
      September 20, 2012

      Hi Rupa use a bulb and solder it through wires to bread board. (use a 12volt mini lamp used in car dash board)

      • niki
        October 31, 2012

        hi sir as i have got to do miniproject to design an experiment for an apllication involving minimum of 1 digital and analog unit it .i am full too confused please help me

      • karan
        August 3, 2013

        But if i use bulb instead of filament on pcb…den hw wud i show dat air is flowing so d resistance is changing..means i nead a open filament to blow air upon.. So how a bulb can be useful?

  • chaitu svsk
    September 13, 2012

    please do explain the working of each component in air flow detector ckt…
    its very urgent…..Please mail me as early as possible..

    • Seetharaman
      September 14, 2012

      Hi Please go through my earlier comment
      March 21, 2010 at 9:54 pm
      Hi Ireti The IC 7805 forms a 60mA constant current source feeding the filament. The voltage drop across it is compared by the comparator IC and the ouput is produced. Normally cold bulb filament resistance is low(a positive temperature coefficient material) as it gets heated up the drop across the filament increases due to which the LED goes on. when the filament senses air flow the heat is removed hence the resistance falls down, due to which the LED goes off. If you want the operation other way, air more than a particular flow to indicate by LED going on, interchange comparator ICs inv and non inv port (4 & 5)

  • NIKHIL
    September 12, 2012

    Sir,
    will you plzz tell me from where i can get the filament or any other component can can i use other than filament???
    plz sir reply me as soon as possible!!!

  • Ayesha
    September 9, 2012

    hello sir,
    I am Ayesha.I am studying 3rd yr(ECE).i am doimg my miniproject on dis air flow dedector topic.

    sir i want to know more details about this project.i am very eager to know dis.so please send me more information about (principle,construction,each elements work) to my mail ID..thank u sir….

  • sajith
    September 2, 2012

    it is very essential for young talented guys

  • sir m neeraj...sir please send me aplication of this project...plz sir rply soon...
    August 30, 2012

    sir m neeraj…plz send me aplication of this project…rply soon…

  • priya
    August 25, 2012

    here what is the purpose of ic7805 and r4 is a variable resistor ?

    • shoair
      November 1, 2012

      lm7805 is voltage regulator ic, means it can give you only 5 volt dc only..
      wel i dn’t think r4 is variable resistor it’s not the symbol of variable resistor..

  • archu
    August 25, 2012

    what is the purpose of Ic7805 anf is r4 is a variable resistor?

  • priya
    August 23, 2012

    helo sir,
    i am doing the same circuit in bread board. i learned from your previous comments that the filament has to be completly removed and soldered but for bread board circuit how should i connect the filament? plz do help me with positive replies

  • shweta gupta
    August 14, 2012

    sr plz send me more information about air flow detector

  • D Suseendrakumar
    July 21, 2012

    Sir,
    I’m Suseendrakumar doing my engineering course in Madras institute of technology. Can you pls tell the circuitry to connect the output to the air flow meter so as to measure the air flow?

  • esa saveme edwin
    June 27, 2012

    Hi Sir/Madam
    i am a student of Nigeria Naval Engineering College Sapele and i’m doing a project on this topic air flow detector(design and construction of air flow detector)and this information is very useful to me. so, i request you to please send me more information about this topic to my mail id.
    Thank you Sir/Madam

    • dops
      July 25, 2012

      what kind of variable resistor should i use?please help:(

    • jansi
      August 3, 2012

      hello sir,
      I am jansi.I am studying 3rd yr(ECE).i m doimg my miniproject on dis air flow dedector topic.sir i want to know more details about this project.i am very eager to know dis.so please send me more information about (principle,construction,each elements work) to my mail ID..thank u sir….

  • Seetharaman
    June 26, 2012

    Hi Can be used to detect the cooling air flow is sufficient, indicating cooling system is functioning. Can also be used for measuring velocity of moving object > or < than the specified value. you may also go through sept 2nd comment.

  • June 25, 2012

    sir I want the applications for air flow detector

  • k.anil varma
    May 18, 2012

    please provide the detail information about this experiment and also tel the working and application of this experiment.

  • chinmay
    April 1, 2012

    please provide the detail information about this experiment and also tel the working and application of this experiment

  • ankit panjwani
    March 29, 2012

    sir,
    sir can u please send me the internal layout of the connections of this circuit so that i can make a pcb for this circuit. i also want the list of applications about this circuit, or where this circuit is used.

    • Deepak Mulewa
      August 16, 2012

      Sir,
      will you plzz tell me from where i can get the filament or any other component can can i use other than filament???
      plz sir reply me as soon as possible!!!!!

  • Jaack
    March 28, 2012

    aneesh m calicut the air flow circuit can be used in Heating Vent AirCconditioning, detecting movement of cargo, parts, people, animals. Automobile cooling, combustion etc. Whenever you want to detect absence or presence of a gas. Air is just one could be exhaust if cool enough avoid corrosive gases in detector circuit. Do NOT use to detect flammable or explosive gases!

  • phangsh
    March 26, 2012

    Hi.I’m working for my project using this circuit. May I know what are the functions of all those components used for this circuit? Especially for resistors and capacitors. Please reply me as soon as possible. I’ll be very grateful for your help.

  • aneesh m calicut
    March 22, 2012

    sir,
    sir,

    i am studying 4th semester B.tech(ece)in MG university, and i m doing mini project on this air flow detector and this information is very useful to me.So, i request you to please send me more information and where the air flow detector is used(list the applications)? about this topic to my mail id.

  • vimala
    March 13, 2012

    Hi sir,
    i am studying 2rd B.tech(ece), and i m doing mini project on this air flow detector and this information is very useful to me.So, i request you to please send me more information about this topic to my mail id.
    Thank You.

  • rama
    February 22, 2012

    Hi sir/madam,
    i am studying 3rd B.tech(ece), and i m doing mini project on this air flow detector and this information is very useful to me.So, i request you to please send me more information about this topic to my mail id.
    Thank You.

  • avaneesh
    January 30, 2012

    Hi sir, I am student in University of pune, i am studying in B.E.(electronics) ,if you can give more information about the rest of the circuit, the function of each resistance, and the function of the capacitor, and if there any hints or notes, because iam trying to make a project semilar to this one. You can send them to me by an email.
    and any modification pls suggest me Thank you.
    and any project on temperature sensor .

  • January 28, 2012

    where the air flow detector is used(list the applications)?

  • Min
    December 17, 2011

    hello sir, its me again. I’m sorry if I asked to much but is it possibly for you to share with me the picture of the circuit?

  • seetharaman
    December 16, 2011

    Hi Min Tungsten has got a good Positive temperature coefficient (alpha) and will not get oxidized easily hence it is preferred.

  • Min
    December 15, 2011

    Thanks, but one more question, I can just do it without the tungstan wire right??

  • Seetharaman
    December 15, 2011

    Hi Min please refer to 26th Oct comment.

  • Min
    December 14, 2011

    I am doing this circuit for my project but It doesn’t work. I really want to do this for my project. My only problem is the Filament, I still don’t know how to connect the filament to the board for testing. Please help me.

  • Shalini
    October 26, 2011

    i’ll try that sir 🙂 thanks a lot for your prompt and positive replies!

  • seetharaman
    October 26, 2011

    Hi Shalini you can use it as it is but it will be bulky you carefully remove the filament including its end connecting stiff wire, and solder the filament through the stiff wire to a small pcb (a standard straight line one or a dotted one – veroboard). now your sensor is ready for use. infact you require a tungstan wire which has a good positive temperature coefficient, which is more suited for the project. since you do not get them freely in the market the simple above procedure is given. you can use a small radio bulb(as small as possible so that it can sense the temperature change big bulbs will take a loger time as they have inert gas filled in, 6 volt 300mA bulb) without breaking it.

  • Shalini
    October 26, 2011

    Thanks a lot sir! But how do i connect the filament in the circuit. Pls help cause i’m pretty clueless about how to do it. After breaking the glass, how do I connect it in the circuit? Only the glass needs to be broken? not the other bulb attachments like the base also?

  • seetharaman
    October 25, 2011

    Hi Shalini you can use the 40watt bulb filament by carefully breaking the glass. this can be best done by keeping the bulb in a thick plastic cover and carefully giving a hit with a sharp tool. now carefully take out the filament and use it. the pot is for the flow level set adjustment. LED will come on when air flow sets in. to ckeck the operation first without any air flow adjust the pot such that the LED just goes off. now slowly bolw air on the filament the LED will come on, indicating the circuit is functioning.

  • Shalini
    October 23, 2011

    Sir, also how do I use the filament specified in the given circuit? It’ll work properly no? I’m relying on it for my project. So awaiting a positive reply…

  • Shalini
    October 23, 2011

    Sir, what is the purpose of the var. resistor (100k – R4)? what resistance do we have to set it to while monitoring the air flow? Pls reply asap… doing a project that needs to be submitted in the next 4 days 🙁

  • August 8, 2011

    Its a nice work am also doing a project work on the air flow detector. pls if you can send its design to me thanks.

  • August 8, 2011

    Sir, please i may also need its application and significance thanks.

  • August 8, 2011

    Hi, Its a nice work. am also doing a project work on air flow detector. Please if you could help me with its design.

  • hemant tewatia
    July 18, 2011

    sir,can u tell, what improvement we done in air flow detector
    any addition can we done???

  • priya
    June 27, 2011

    please do explain the working of each component in air flow detector ckt…the connection is simple n works really good….please send the information to my mail….

  • ankit rathore
    February 8, 2011

    actually i want to make air flow detector as my minor project so can u plz provide me PCB arrangement for this;;

  • M.SHIRISHA
    December 15, 2010

    also explain in detail about application in boiler furnace

  • M.SHIRISHA
    December 15, 2010

    can u list any other industrial applications of the circuit……..we are asked to give industrial applications

  • December 15, 2010

    sir can explain in detail about application of air flow detector in boilerfurnace…………
    can u list any other industrial applications of the circuit……..we are asked to give industrial applications

  • December 15, 2010

    Thanks a lot for ur response….
    i got output for the circuit ………but filament is very sensitive it is easily getting damaged…….can u suggest any other component in the place of filament ……

  • fozia
    October 24, 2010

    You can send them to me by an email.
    Thank you

  • fozia
    October 24, 2010

    hi sir
    The project seems to be quite interesting and I would surely try this project this semester.Could you please explain me the project in a bit more details.
    If you can give more information about all the componantst, the function of each resistance, and the function of the capacitor, and if there any hints or notes,& how it works with datasheets.

  • selorm agbo
    October 6, 2010

    I am student in knust, iam studying biomedical engineering,if you can give more information about the rest of the circuit, the function of each resistance, and the function of the capacitor, and if there any hints or notes, because iam trying to make a project semilar to this one. You can send them to me by an email.
    Thank you

  • mc
    September 13, 2010

    hi sir..
    may you pls help us upgade ths circuit by putting different levels of required air flow

  • seetharaman
    September 8, 2010

    Any low noise operational amplifier will do to give the required gain and off set. 725, 308, 071, 3140 etc. the output of this ic can be fed to a 3 1/2 digital display normally comes with 0 to 200mV DC FS.

  • sus
    September 7, 2010

    can i please know which ic an i use to get the analog out put from the filament to be converted to a binary digital output or directly to 7 seg display.

  • seetharaman
    September 2, 2010

    Hi SHIRISHA practical application in boiler furnace air flow measurement, will enable total combustion of oil, coal or gas. air flow measurement through any air duct. for temperature and pressure measurement you have to add suitable sensors like RTD pressure transducer etc.
    to add digital indication you can use the analog value availabe at the filament through amplification, can be calibrated to velocity of air flow by comparison

  • shirisha
    September 2, 2010

    Thanks for ur response sir …….
    can u give practical applications of this circuit in industries………..

    i also want to extend this project….like i want to include numerical indication of air flow level….
    can include any other circuit to detect temperature or pressure in this can you send me circut

  • seetharaman
    August 25, 2010

    Hi Shirisha please go through my march12th comment, that will give you the idea on the principle of operation. air flow meters are of different type. measurement with rotating vane speed is anemometer, and hot filament type is the above one. both are fairly accurate if properly calibrated.

  • shirisha
    August 24, 2010

    i also want to extend this project….like i want to include numerical indication of air flow level….
    can include any other circuit to detect temperature or pressure in this can you send me circut

  • shirisha
    August 24, 2010

    sir can i also know about application of this projec in industry ….more over how this instrument is different form other air flow detectors….i also need advantages,disadvantages and precaution to be taken…
    dont mind please answer to my questions

  • shirisha
    August 24, 2010

    hello sir i am shirisha from gnits……i am doing mini project on air flow detector …….i need complete information about working of this circuit and funtioning of each componenent placed ……

  • seetharaman
    June 26, 2010

    Hi Rupak the standard method is to use a rotating blade anemometer. this uses the principle of cooling due to air flow on a heated wire. as the air flow increases the cooling is greater. as it is a matalic wire with positive resistance temperature coefficient the value of resistance of the filament (sensor) is measured to indicate the flow.

  • Rupak
    June 26, 2010

    sir,
    the project seems to be quite interesting and I would surely try this project this year.Could you please explain me the project in a bit more details

  • adeel
    April 18, 2010

    thanx for giving the information of this project…
    Sir…!
    we are doing a project on air-flow detector…and we need to demonstrate and give the presentation to our Externals in the University…
    so pls provide me the complete informations about the project with diagram & the picture of this project Air Flow Detector…!

    Thanx…

  • seetharaman
    March 21, 2010

    Hi Ireti The IC 7805 forms a 60mA constant current source feeding the filament. The voltage drop across it is compared by the comparator IC and the ouput is produced. Normally cold bulb filament resistance is low(a positive temperature coefficient material) as it gets heated up the drop across the filament increases due to which the LED goes on. when the filament senses air flow the heat is removed hence the resistance falls down, due to which the LED goes off. If you want the operation other way, air more than a particular flow to indicate by LED going on, interchange comparator ICs inv and non inv port (4 & 5)

  • ireti
    March 21, 2010

    Hi sir, I am student in oou ago iwoye ogun state Nigeria, i am studying physics with electronics ,if you can give more information about this air flow detector circuit, the function of each resistance, and the function of the capacitor, and if there any hints or notes, because am to make a project on it. You can send them to me by an email.
    Thank you

  • March 19, 2010

    what is the need of IC7805 in this circuit?

  • vishal
    March 5, 2010

    sir i want to know whether this circuit can also indicate the direction in which air flows?

  • February 11, 2010

    hi sir thanks to all give for information

  • January 29, 2010

    What is the output voltage of this circuit?

  • Seetharaman
    January 16, 2010

    Hallo Usama and Manish IC1 is a constant current source of 60mA for the filament. IC2 is a comparator. With the present circuit the LED will become dim with higher air flow. To make it brighter with higher air flow interchange inv and non-inv inputs of IC2. or alternately return the LED to ground instead of plus 12Volt. IC2 can be replaced with TL071. Happy assembling and enjoy

  • John
    November 18, 2009

    This is a simple but useful circuit, thanks for making it freely available. That said I expected the circuit to function in reverse, instead of the LED dimming when airflow is detected I assumed it would brighten. Any suggestions on how to modify the circuit so that the LED brightens with air movement? I tried reversing the input signal to the comparator and it does work but the output barely lights the LED.

  • usama
    November 9, 2009

    i want the simple diagram of this circuit will you give mee plzz??

  • August 22, 2009

    hello, give me some more information about this project

  • gurmeet
    August 18, 2009

    pls sir/madam….!!
    we are doin a project on air-flow detector!!
    and we need to give a good presentation to our teachers….!!
    so pls provide me with the informations about the project!!

  • akshatha
    August 12, 2009

    pls sir/madam….!!
    we are doin a project on air-flow detector!!
    and we need to give a good presentation to our teachers….!!
    so pls provide me with the informations about the project!!

  • solomon
    June 22, 2009

    it is good for air flow sensor and i says thanks more on your advice

  • kbrom
    May 31, 2009

    project for air flow detector &the fuction of each components & how it works with datasheets

  • Mohamed Anany
    January 22, 2009

    Hi sir, I am student in Cape Breton University, iam studying electronics and control systems,if you can give more information about the rest of the circuit, the function of each resistance, and the function of the capacitor, and if there any hints or notes, because iam trying to make a project semilar to this one. You can send them to me by an email.
    Thank you

  • Brighton Zibengwa
    June 14, 2008

    inclusion of track lay-out will b greatly appreciated by students aspecially. those who take electronics as a hobby

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