How to make a Touch Sensor using BC547 transistor on Breadboard

In this video, I have made a simple touch sensor circuit using the BC547 transistor on the breadboard. This touch sensor can be used as both touch sensitive light switch and door bell. I have also explained the working principle of the touch switch circuit.
I will request you to watch the complete tutorial video of the touch sensor project but you can also jump to any topic by click on the following Time Stamps:
00:34 How to design a simple touch sensor circuit using transistors
03:31 How to make touch sensitive door bell
04:30 Working principle of the touch sensor switch
Components Required for the touch sensor:
1. BC547 transistor 2no
2. 10K ohm resistor 1no
3. 220-ohm resistor 1no
4. LED or DC buzzer
5. 9 volt Battery
6. Connecting wires
7. Breadboard
Here I have made a simple touch sensitive switch using BC547 NPN transistor and I have explained the working of the touch switch using the touch switch circuit diagram for better understanding that how the touch sensor works.
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[@progamermajsc7230]

Very nice video.I like the making part and the explanation of the schematic.Thank you for these videos.

[@souravdey1227]

you just made my day.... wonderful. I was having a very bad day.
and then i found this video and tried this circuit. and voila!! I was happy... seriously man! thanks a lot for making me happy!! (Perhaps you will not understand why I am thanking you so much for such a simple thing, but never mind!!)

[@TechStudyCell]

Thanks for the feedback.

[@veeraraghul9626]

Bro where to get metal wire

[@Creativity06]

@@veeraraghul9626 you can take it from any wire.

[@sambasivarao2711]

I am Dr. Chivukula Sambasiva Rao, I did the project . Under Your guidelines it's work very well 🎉 TQ

[@cndbrn7975]

easy to follow step by step instructions, thanks ..

[@jeganathanmanickam6604]

Thank you, I tried this at my home, flawlessly worked!!

[@TechStudyCell]

Great 👍

[@jeganathanmanickam6604]

@@TechStudyCell I'm interested to try more projects like this, please help sharing any other videos or projects like this to try at home :) Thank You

[@ron1368]

Nice presentation! Goodjob thank you

[@TechStudyCell]

Thanks...

[@eb_reviews]

Good explanation. Thank you

[@amintimani6034]

Which transistor did u use

[@j.clowers7223]

Very cool...please do more shows like this..

[@TechStudyCell]

Thank you for the feedback.

[@MuhammadAsif-rv6br]

So nice and cool vedio i use this for my electronics project

[@kiranstechhobbies8993]

Good job... Well explained👏👏👏 all the best😇😇

[@TechStudyCell]

Thanks

[@smash7777-]

Cool video....thanks for sharing! :)

[@TechStudyCell]

Thanks for the feedback

[@ElexorEnt]

great video and easy to understand

[@TechStudyCell]

Glad it helped

[@sambasivarao2711]

Good explanation 😊

[@nocopyrightbollywoodsongs8561]

Well explained

[@rakeshtiwari594]

I am try to this project it's work very successful

[@TechStudyCell]

great...

[@tejasmhala8065]

I try but not working

[@tejasmhala8065]

Sorry working successful

[@laidman2007]

Very clear explanation. Thank you!

[@amintimani6034]

Tejas Mhala which transistor did u use

[@alphabandajunior5375]

Thank you so much your video has helped cause i have a project to submit at school. Thanks once again Sir...
@Tech StudyCell

[@mahi_shan1361]

Thanks for this video is very beautiful

[@TechStudyCell]

You are welcome...

[@onkarsonawane8279]

Is it possible to hold the signal on first touch upto next touch?
Means on 1st touch light will glow and on next touch light turns off?

[@sravankumar601]

By far the best video i saw

[@TechStudyCell]

Thanks

[@girish4249]

Best for mini project

[@TechStudyCell]

Thanks

[@rusulriad3072]

Can we use transicter Bc548 inside of Bc547 ??

[@kychemclass5850]

Another really good video. Tq. !!

[@TechStudyCell]

Welcome

[@devendramuduli3136]

Please tell how to make a single plate touch switch . And the led , connected in the output , will glow only on touching the metal plate . Means as soon as the finger is withdrawn the led will stop glowing.

[@efesseu]

Mantap la awa

[@whiterosemid]

Can I drive a relay in place of LED? Thanks.

[@SaranyaSaranya-uj3um]

Hi.. Its nice video & got output perfectly by using both LED & BUZZER. Can u explain how its happening? I am unable to understand... how its working? By connecting base & collector

[@TechStudyCell]

very small current flow through your finger from collector to the base so transistor turns on and start conducting. thus circuit turns on.

[@t.prasadpandu4357]

Super bro we got the experiment
Thanks 👍 bro

[@TechStudyCell]

Welcome 👍

[@harvinderkaur9263]

Sir i want to operate 12 v relay woth touch sensor...can i?

[@Rabi_Burud]

Amazing bro ♥... Working smoothh..
I want your help brother.... Is there any good site from where we can buy such small components? I struggle a lot to buy these small tiny things

[@fay1295]

how did you find the calculations

[@mamtasaxena2303]

Nice video but we don't have great plate

[@47abdulrehaman37]

It is really awesome

[@TechStudyCell]

Thanks 😊

[@matsbjnnes366]

Do you have a circuit diagram for this?

[@rrp3677]

Good...

[@amitricha688]

What is role of both resistors in the circuit????

[@nitinnikam1808]

my friend used this project but her project teacher ask question why used this 10k
and 220ohm resistors in ckt

you need a 1k ohm pullup resistor between led ground and positive 5v

[@udiptadutta9826]

Can we use bc548 instead of bc547 ?

[@nitinnikam1808]

What the current across LED ??

[@divyanshisingh3275]

Nice

[@TechStudyCell]

Thanks

[@aakashsharma1043]

While touching one touch wire, my LED Is glowing . can you rectify me

[@MuhammadAsif-rv6br]

Thanks

[@TechStudyCell]

Welcome

[@prathameshvarashetti2562]

Can I use higher values of resistor like 10 M 0r 1M ohm etc.

[@bijenadhikari]

bro as the value of the resistor increases then the brightness of the light decreases. you can use the higher value of resistor when the supplied voltage or current is higher.

[@rahmatabadi3839]

How happens if you touch the left wire with left hand and the right wire with the right hand? Does it still work?

[@bijenadhikari]

If you only touch the base then it will works its because there is also small amout of current flowing through your body. Now, turning to your question then the answer is yes. the circuit will work.

[@muthuprasanna9645]

bro can i give 24v d.c supply for BC547 transistor for running 24v d.c motor

[@TechStudyCell]

It better to use a power transistor instead of BC547

[@witek3437]

If you remove transistor T1 and put a normal switch, will it be the same?

[@TechStudyCell]

If you remove T1 with a manual switch then the led will glow when the switch is in on state. Then the circuit will no more a touch switch circuit.

[@milindgautam2994]

What are the possible viva questions that can be asked from this project?

[@mitulkumarchoudhary5867]

Kya bhai 😂😂😂

[@milindgautam2994]

@@mitulkumarchoudhary5867 😂😂

[@starlord814]

Can you give description in chrome

[@adamadness2283]

I made it easy and it have and gate in only 2 transiter

[@tiktokprince4961]

The circuit works even with one transistor . What is the purpose of second transistor other than amplification purpose?

[@TechStudyCell]

The 2nd transistor is used for better amplification.

[@tiktokprince4961]

@@TechStudyCell other than amplification any other purpose?

[@zackam5870]

can I use this circuit on PCB?

[@TechStudyCell]

Yes

[@bijenadhikari]

yes

[@Ramdut369]

Send pcb design

[@bhojpuriyapandit5686]

Make the emergency light of touch sensor use the bc547 transistor

[@amintimani6034]

Which transistor

[@uxmuu204]

I made about same with 1 WIRE

[@jitendtakumar9244]

Ap kebal ek tar bala car ka touch sensor bana ke dekhao jo ki car ko touch krne pr bole ye do tar ka h

[@yedukondalumanyam2833]

Can I use 10ohm instead of 10k I'm resistor

[@TechStudyCell]

it's better to use higher value resistance.

[@amitricha688]

@@TechStudyCell why is it better to use high value resistance ? What will happen if we use low value resistance ? Will it affect the circuit?

[@fenshas]

Can we do with one transiator .!!!🤔

[@keynonketcher1525]

White Feather ues but the led shoud be connected in series

[@anonymoussinger5453]

can I use BC548 transistor??...
plzzz reply

[@TechStudyCell]

yes

[@amitricha688]

By mistake if I connect negative of buzzer with positive of breadboard will the breadboard get destroyed

[@TechStudyCell]

no.

[@user-hs2tb8lq2t]

What we call that board on which whole thing is done ?£

[@ankitrajmahapatra4766]

Nanobot it's called breadboard.

[@aakankshasingh1530]

Agr kisi dusre resistance ka resistor use krenge toh yeh work nhi krega kya

[@TechStudyCell]

Yes it will work. But choose close resistance value

[@aakankshasingh1530]

@@TechStudyCell thnx☺

[@mamtasaxena2303]

Can it be done in PCB

[@TechStudyCell]

yes

[@najeebullah-yw3hv]

Can we make this wit H331 transistor

[@TechStudyCell]

You can use any Bjt npn transistor

[@jilumaryjoseph4759]

Can I use this circuit to develop EV3 Touch Sensor.Pls reply

[@veeraraghul9626]

Where to get metal wire bro

[@TechStudyCell]

Cooper wire can be used instead

[@xaviwasnt6852]

Can I ask for the circuit design?

[@TechStudyCell]

After watching the video you can easily design the circuit.

[@janyak.m.3876]

can i use male to female connecting wire

[@TechStudyCell]

yes

[@Luken__Vlogs]

The resistor is connected to the collector, not emitter....

[@user-ur7xw6nv7z]

You mean the 10K resistor, ok, but this person is one of the BEST to teach ELECTRONICS. CONGRATULATIONS And THANKS.

[@krskrs8299]

Please place circuit diagram for talking toys

[@mouadh8046]

where we can find bc547 ??

[@TechStudyCell]

You can find BC547 from any local electronics shop, Amazon etc. Or you can use any NPN Transistors instead BC547

[@mouadh8046]

@@TechStudyCell tnx bro .. Can you give me an alternative because I don't understand in electronics .. Something I can find inside home appliances

[@badralbatochir2786]

use ldr

[@miansalahuddin5720]

if you like to explain ............. why you are two transistors BC 547 ??????

[@TechStudyCell]

For better amplification of input signal. you can use one instead.

[@nagarajunagaraju-ut5in]

Circuit

[@JorgeRamirez-kv4jx]

Send signal

[@Chota.elvish_.shailendra.]

Ye Modl jesa Modl mera tha lekin mere sath beimani hui