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Air flow detector circuit.adminJune - 7 - 2008117 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 givenspace.

The filament of a incandescent bulb is the sensing part of the circuit.When there is no air flow the resistance of the filamentwill be low.When there is air flow the resistance drops , because the moving air will remove some of the heat generated inthe filament.This variations in the resistance will produce variation of voltage across the filament.These variations will bepicked 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.

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.

Air flow detector circuit. - Electronic Circuits and Diagram-Electronics P... http://www.circuitstoday.com/air-flow-detector-circuit

1 of 20 7/23/2013 9:13 AM

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117 Responses to Air flow detector circuit.

rajeevkumar says:June 20, 2013 at 5:15 am

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

ReplySeetharaman says:April 28, 2013 at 8:16 am

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

ReplyADNAN says:April 26, 2013 at 12:36 pm


2 of 20 7/23/2013 9:13 AM

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.

Replynidhi says:April 24, 2013 at 7:50 am

plzzzzz tell me that where it is used

Replyduncan says:April 15, 2013 at 11:51 am

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

ReplySeetharaman says:April 16, 2013 at 9:43 am

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(theair flow will cool the bulb filament (which is heated by constant current flow through it). Once the air flowdecreases the bulb temperature will increase its resistance will increase which will detected and indicated by theLED.Reply

ReplyAnmol says:April 17, 2013 at 5:44 am

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

Anmol says:April 14, 2013 at 8:45 pm

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

ReplyTahsinur Rahman says:March 30, 2013 at 10:25 pm

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

Replyvivesh says:March 23, 2013 at 5:43 am

can you explain npn transistor and how wor

ReplyJ.Hepzibah beulah says:


3 of 20 7/23/2013 9:13 AM

March 15, 2013 at 4:39 am

Hai sir, i want to know the complete info that how much amount of air this circuit detects. and added that what is thereplacement for filament in this circuit. how can i enhance this circuit in real time applications. ive chosen this as mymini project in this sem . so please send all these informations to my mail soon. thank u very muchReplyfad says:March 13, 2013 at 8:38 pm

name of connection of the resistors?

Replydips says:March 13, 2013 at 6:51 pm

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

Replynagaraj says:February 28, 2013 at 7:00 am

can u give me the detail information about application of air flow detector and where it is mainly used..? plzgive 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 forthat circuit sir.

Replyvishwanath kharabe says:February 27, 2013 at 12:15 am

fineits good one &easier


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


can u give me the detail information about application of air flow detector and where it is mainly used..? plzgive me the answer,im doing mini project on this topic sir.Replyganesh says:February 22, 2013 at 1:23 am

air flow

Replygaurav says:February 18, 2013 at 1:01 am

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


4 of 20 7/23/2013 9:13 AM

Replysudan says:February 11, 2013 at 7:10 am

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

ReplySeetharaman says:March 16, 2013 at 8:15 am

Hi Please go through my 31st October comment

ReplyAadil says:February 5, 2013 at 10:42 am

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

Engr Adnan says:March 13, 2013 at 7:50 am

Salam,, dear Aadil, its very cheap project..About PKR.500..If u want to learn, dont see expenses..or work in group..

Replygaurav says:February 4, 2013 at 1:05 am

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 informationabout (principle,construction,each elements work) to my mail ID..thank u sir.

ReplyHARISH says:January 30, 2013 at 11:51 pm

anyone send airflow detector final documentation.

ReplyDebasis Singha says:December 24, 2012 at 8:12 am

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

ReplyAliya says:December 23, 2012 at 8:52 pm

May i know the practical apps of this??

Replyhaimobati says:December 22, 2012 at 11:42 pm

plz send me more detail about this project.Reply


5 of 20 7/23/2013 9:13 AM

PATL UV says:October 26, 2012 at 2:36 am

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

Replyseetharaman says:October 31, 2012 at 6:10 am

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(theair flow will cool the bulb filament (which is heated by constant current flow through it). Once the air flowdecreases the bulb temperature will increase its resistance will increase which will detected and indicated by theLED.

Replypatel uv says:November 5, 2012 at 8:57 am

thanx sir thank you very much

Replyshwetha says:September 26, 2012 at 2:06 am

plz some info about dis.

ReplyABHISHEK says:September 20, 2012 at 1:19 am

plz send me more detail of this project.ReplyRupa says:September 20, 2012 at 12:34 am

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

Replyseetharaman says:September 20, 2012 at 9:37 am

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

Replyniki says:October 31, 2012 at 9:24 am

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

Replychaitu svsk says:September 13, 2012 at 5:49 am

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


6 of 20 7/23/2013 9:13 AM

ReplySeetharaman says:September 14, 2012 at 4:42 am

Hi Please go through my earlier commentMarch 21, 2010 at 9:54 pmHi Ireti The IC 7805 forms a 60mA constant current source feeding the filament. The voltage drop across it iscompared by the comparator IC and the ouput is produced. Normally cold bulb filament resistance is low(apositive temperature coefficient material) as it gets heated up the drop across the filament increases due towhich 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 indicateby LED going on, interchange comparator ICs inv and non inv port (4 & 5)

ReplyNIKHIL says:September 12, 2012 at 5:59 am

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!!!

ReplyAyesha says:September 9, 2012 at 7:30 am

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 informationabout (principle,construction,each elements work) to my mail ID..thank u sir.

Replysajith says:September 2, 2012 at 1:27 am

it is very essential for young talented guys

Replysir m neeraj...sir please send me aplication of this project...plz sir rply soon... says:August 30, 2012 at 4:17 pm

sir m neerajplz send me aplication of this projectrply soonReplypriya says:August 25, 2012 at 5:06 am

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

Replyshoair says:November 1, 2012 at 9:19 am

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

Replyarchu says:August 25, 2012 at 5:04 am


7 of 20 7/23/2013 9:13 AM

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

Replypriya says:August 23, 2012 at 6:48 am

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

Replyshweta gupta says:August 14, 2012 at 9:51 pm

sr plz send me more information about air flow detector

ReplyD Suseendrakumar says:July 21, 2012 at 8:51 pm

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

Replyesa saveme edwin says:June 27, 2012 at 4:23 am

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

Replydops says:July 25, 2012 at 9:07 pm

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

Replyjansi says:August 3, 2012 at 10:27 pm

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 knowmore 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.

ReplySeetharaman says:June 26, 2012 at 9:48 am

Hi Can be used to detect the cooling air flow is sufficient, indicating cooling system is functioning. Can also be usedfor measuring velocity of moving object > or < than the specified value. you may also go through sept 2nd comment.Replyvenky says:June 25, 2012 at 11:57 pm


8 of 20 7/23/2013 9:13 AM

sir I want the applications for air flow detector

Replyk.anil varma says:May 18, 2012 at 1:15 am

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

Replychinmay says:April 1, 2012 at 2:28 am

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

Replyankit panjwani says:March 29, 2012 at 10:34 pm

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. ialso want the list of applications about this circuit, or where this circuit is used.

ReplyDeepak Mulewa says:August 16, 2012 at 8:39 am

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

ReplyJaack says:March 28, 2012 at 1:42 am

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 agas. Air is just one could be exhaust if cool enough avoid corrosive gases in detector circuit. Do NOT use to detectflammable or explosive gases!

Replyphangsh says:March 26, 2012 at 6:52 am

Hi.Im working for my project using this circuit. May I know what are the functions of all those components used forthis circuit? Especially for resistors and capacitors. Please reply me as soon as possible. Ill be very grateful for yourhelp.

Replyaneesh m calicut says:March 22, 2012 at 6:46 am

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 thisinformation is very useful to me.So, i request you to please send me more information and where the air flow detectoris used(list the applications)? about this topic to my mail id.

Reply


9 of 20 7/23/2013 9:13 AM

vimala says:March 13, 2012 at 12:57 am

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 tome.So, i request you to please send me more information about this topic to my mail id.Thank You.

Replyrama says:February 22, 2012 at 6:51 am

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 tome.So, i request you to please send me more information about this topic to my mail id.Thank You.

Replyavaneesh says:January 30, 2012 at 11:46 pm

Hi sir, I am student in University of pune, i am studying in B.E.(electronics) ,if you can give more information aboutthe 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 .Replyvigneshwar says:January 28, 2012 at 6:40 am

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

ReplyMin says:December 17, 2011 at 11:42 pm

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

Replyseetharaman says:December 16, 2011 at 12:13 pm

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

ReplyMin says:December 15, 2011 at 9:40 pm

Thanks, but one more question, I can just do it without the tungstan wire right??ReplySeetharaman says:December 15, 2011 at 9:40 am

Hi Min please refer to 26th Oct comment.

ReplyMin says:


10 of 20 7/23/2013 9:13 AM

December 14, 2011 at 10:30 pm

I am doing this circuit for my project but It doesnt work. I really want to do this for my project. My only problem isthe Filament, I still dont know how to connect the filament to the board for testing. Please help me.

ReplyShalini says:October 26, 2011 at 9:50 am

ill try that sir thanks a lot for your prompt and positive replies!

Replyseetharaman says:October 26, 2011 at 9:38 am

Hi Shalini you can use it as it is but it will be bulky you carefully remove the filament including its end connecting stiffwire, 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 temperaturecoefficient, which is more suited for the project. since you do not get them freely in the market the simple aboveprocedure is given. you can use a small radio bulb(as small as possible so that it can sense the temperature change bigbulbs will take a loger time as they have inert gas filled in, 6 volt 300mA bulb) without breaking it.


Thanks a lot sir! But how do i connect the filament in the circuit. Pls help cause im 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 bulbattachments like the base also?

Replyseetharaman says:October 25, 2011 at 4:37 pm

Hi Shalini you can use the 40watt bulb filament by carefully breaking the glass. this can be best done by keeping thebulb 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 firstwithout any air flow adjust the pot such that the LED just goes off. now slowly bolw air on the filament the LED willcome on, indicating the circuit is functioning.


Sir, also how do I use the filament specified in the given circuit? Itll work properly no? Im relying on it for myproject. So awaiting a positive replyReplyShalini says:October 23, 2011 at 6:59 am

Sir, what is the purpose of the var. resistor (100k R4)? what resistance do we have to set it to while monitoring the airflow? Pls reply asap doing a project that needs to be submitted in the next 4 days ReplyHarison says:August 8, 2011 at 4:31 am

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.


11 of 20 7/23/2013 9:13 AM

Replysamson Awaje says:August 8, 2011 at 4:26 am

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

Replysamson says:August 8, 2011 at 4:24 am

Hi, Its a nice work. am also doing a project work on air flow detector. Please if you could help me with its design.Replyhemant tewatia says:July 18, 2011 at 11:11 pm

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

Replypriya says:June 27, 2011 at 1:15 am

please do explain the working of each component in air flow detector cktthe connection is simple n works reallygood.please send the information to my mail.

Replyankit rathore says:February 8, 2011 at 9:48 am

actually i want to make air flow detector as my minor project so can u plz provide me PCB arrangement for this;;ReplyM.SHIRISHA says:December 15, 2010 at 7:40 am

also explain in detail about application in boiler furnace

ReplyM.SHIRISHA says:December 15, 2010 at 7:39 am

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


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


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 anyother component in the place of filament

Reply


12 of 20 7/23/2013 9:13 AM

fozia says:October 24, 2010 at 8:24 pm

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

Replyfozia says:October 24, 2010 at 8:22 pm

hi sirThe project seems to be quite interesting and I would surely try this project this semester.Could you please explain methe 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 thecapacitor, and if there any hints or notes,& how it works with datasheets.

Replyselorm agbo says:October 6, 2010 at 2:21 am

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

Replymc says:September 13, 2010 at 10:00 am

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


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

Replysus says:September 7, 2010 at 10:05 am

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


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

Replyshirisha says:September 2, 2010 at 8:29 am


13 of 20 7/23/2013 9:13 AM

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

Replyseetharaman says:August 25, 2010 at 10:07 am

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

Replyshirisha says:August 24, 2010 at 10:23 pm

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


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


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

Replyseetharaman says:June 26, 2010 at 10:16 pm

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

ReplyRupak says:June 26, 2010 at 1:09 pm

sir,the project seems to be quite interesting and I would surely try this project this year.Could you please explain me theproject in a bit more detailsReplyadeel says:April 18, 2010 at 3:10 am

thanx for giving the information of this projectSir!we are doing a project on air-flow detectorand we need to demonstrate and give the presentation to our Externals inthe University


14 of 20 7/23/2013 9:13 AM

so pls provide me the complete informations about the project with diagram & the picture of this project Air FlowDetector!

Thanx

Replyseetharaman says: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 iscompared by the comparator IC and the ouput is produced. Normally cold bulb filament resistance is low(a positivetemperature coefficient material) as it gets heated up the drop across the filament increases due to which the LED goeson. when the filament senses air flow the heat is removed hence the resistance falls down, due to which the LED goesoff. If you want the operation other way, air more than a particular flow to indicate by LED going on, interchangecomparator ICs inv and non inv port (4 & 5)

Replyireti says:March 21, 2010 at 1:10 pm

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

Replyshashidhar h says:March 19, 2010 at 4:46 am

what is the need of IC7805 in this circuit?

Replyvishal says:March 5, 2010 at 5:55 am

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

Replyeyesheild says:February 11, 2010 at 12:57 am

hi sir thanks to all give for information

ReplyAshwini says:January 29, 2010 at 6:56 am

What is the output voltage of this circuit?

ReplySeetharaman says:January 16, 2010 at 9:30 pm

Hallo Usama and Manish IC1 is a constant current source of 60mA for the filament. IC2 is a comparator. With thepresent circuit the LED will become dim with higher air flow. To make it brighter with higher air flow interchange invand non-inv inputs of IC2. or alternately return the LED to ground instead of plus 12Volt. IC2 can be replaced withTL071. Happy assembling and enjoyReplyJohn says:


15 of 20 7/23/2013 9:13 AM

November 18, 2009 at 12:09 am

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

Replyusama says:November 9, 2009 at 2:37 am

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

Replymanish gaur says:August 22, 2009 at 1:01 am

hello, give me some more information about this projectReplygurmeet says:August 18, 2009 at 5:45 am

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!!Reply

admin says:August 18, 2009 at 10:43 pm

I think this wind meter circuit http://www.circuitstoday.com/wind-meter is better for a project.Reply

akshatha says:August 12, 2009 at 2:12 am

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!!Replysolomon says:June 22, 2009 at 10:19 am

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

Replykbrom says:May 31, 2009 at 9:54 pm

project for air flow detector &the fuction of each components & how it works with datasheetsReplyMohamed Anany says:January 22, 2009 at 11:19 pm

Hi sir, I am student in Cape Breton University, iam studying electronics and control systems,if you can give more


16 of 20 7/23/2013 9:13 AM

information about the rest of the circuit, the function of each resistance, and the function of the capacitor, and if thereany 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

ReplyBrighton Zibengwa says:June 14, 2008 at 6:38 am

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

Reply

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Air Flow Detector Circuit. - Electronic Circuits and Diagram-Electronics Projects and Design

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