All You Need To Know About TRANSISTORS To Fix Stuff! How Transistors Work Test In & Out of Circuit

[@daverush1091]

All I can say is that these are the best electronic repair videos on the internet. Not kidding. You are doing a great job. I plan to watch all of them. Thanks for putting them out there.

[@deedeelabricolade]

This channel is pure gold to learn basic electronics but without the boring parts, with well prepared episodes and with a logical structure! I can't thank you enough for this!

[@jonathansnow5198]

I enjoy how you get right to the info without doing a whole intro with a logo and annoying music. Just a simple logo dancing there as you start. Thank you for that.

[@LearnElectronicsRepair]

Cheers 😀

[@Infiniti25]

It is time saving I agree, very thoughtful.

[@plageran]

no 5 minutes blabbering

[@LearnElectronicsRepair]

It has been mentioned a few times 🙂

[@MrTaylorJefferys]

I'm not even going to let the video finish I want to say I've been trying to figure out transition for 10 years this is the first time that I've understood it 100% and it makes perfectly good sense to me now thank you very much

[@LearnElectronicsRepair]

You are welcome ,and thank you for such as nice comment. There are many many videos explaining transistors but now I feel like I achieved something 😊

[@MattyEngland]

Watched lots of videos about transistors, yours is by far the best. Thank you.

[@ianhewitt1858]

Really good explanation and presented very well. Not patronising, but clearly a man who knows his stuff and can convey it to others. Just wish I had come across this sooner. So thanks for taking the time to record this and get it out there. Very much appreciated.

[@jimbossemi-customs3129]

Best electronics site I've found, you explain everything very clear to a person who knows just enough to be dangerous. I've learned a lot from you, thank you.

[@steveo44]

These videos are amazing. Thanks for taking the time. Wish I had these at college

[@Fanan67]

Excelent video, clear and simple concepts. Learning a lot with your lessons. Thank you for your time.

[@toneelectronix]

Germanium transistors are still used for guitar fuzz boxes to this day. Usually to get the "vintage tone" some guitarists search for. One thing I noticed also, with the cheap transistor tester, it read 1.1v for voltage drop on the darlington. That could indicate it is reading 2x the voltage drop of each junction inside. Love your videos! Keep them coming! Thank you so much!!

[@HairyHu]

@Tone Electronics "Usually to get the "vintage tone...". Well not really. They use them because they have low forward bios voltage 0.2 compared to silicon 0.6. Guitar pickups generate low voltages (the magnetic ones). I think you may be mistake it with tube amplifiers. They have a more mellow "vintage tone" .

[@T2D.SteveArcs]

​@@HairyHu that makes no sense whatever, the transistors are bias into conduction with bias resistors, so the 0.2v/0.6v is mitigated and the AC signal is then coupled in through a capacitor, transistors are current driven devices so it's the gain that's important, silicon transistors have a lot more gain than germanium hence you would need more stages depending on how small a signal you were amplifing I built a non contact probe using silicon transistors that can sniff a audio cable (basically a few mV of leakage) the video is on my channel, the guy is right people still use germanium transistors in pedals etc because they say they sound better (despite them being obsolete, unstable, leaky and very inconsistent electrically ) this instability gives them a more dynamic and expressive character, the also have a lower frequency response than silicon which I suspect causes the retro sound the FX guys speak of

[@michelbadawi1]

I wanted to take a moment to express my sincere gratitude for the incredible seminar you conducted on semiconductors, transistors, and MOSFETs. Your ability to break down complex concepts in a clear and concise manner within just one hour was truly impressive. Your passion for the subject shone through, making the intricacies of these components comprehensible and engaging. As someone who has struggled to grasp these concepts in the past, I can confidently say that your session has provided me with a newfound understanding that I failed to achieve during my months in university.

[@Daffydubs]

Man you should put these on Spotify! I would listen to these at work everyday.

[@Thetraful]

Much thanks and greetings from germany. The way you explain those topics is just amazing and very understandable. Please keep going with the video series as this is a great value for young upcoming technicians and engineers. Thank you so much! 🇩🇪👍🏻

[@Ori-Retro-Gamer]

Really enjoying your instruction, i wish i has youtube and tuition like this back in the 80's when i was studying GCSE electonics.. the kids don't know how lucky they are. Many thanks

[@Maxximilian]

The last 7 minutes are golden.

[@simonlevett4776]

And the first hour was a waste of time was it ?

[@Curranproducer]

in the 1st 8 minutes of this video I learned MORE about transistors than I have in 5 years of trying to read about them and comprehend them! thank you!

[@LearnElectronicsRepair]

You're welcome 🙂

[@retronexusnet]

One of the best Transistor videos I have seen

[@BUTTEWORKS]

This channel is fantastic, so much information clearly explained. Thank you for taking the time making this videos.

[@zopilotesky]

Very well presented, and definitely the best explanation on the subject I've seen yet. Thanks for sharing.

[@ClausenLT]

This is really cool. I have a pretty nice Parasound 6 channel amp. I'm pretty good at fixing very basic stuff, but the issue I am having with this amp, I didn't think was something I would be able to tackle myself. But the cool part is I have sat here, without really getting distracted, and watch 50 minutes so far, and I'm not really getting lost or confused. I don't understand everything, but I understand enough so I think i can continue to learn and maybe fix the issue I am having with this amp, which is a protection overload issue on one channel. I will keep watching and learning. Thanks for this awesome channel!

[@highflyingfalcon1380]

God bless you for the precious knowledge, that you give as for free!

[@danielgodlewski9932]

Really appreciate every single video of this series. Thank you!!!

[@briankotze57]

Agree with previous comments. Firts time transisors makes sense to me. Appreciate the time and effort.

[@LearnElectronicsRepair]

Thank You

[@christopherholmqvist321]

I'm blown away about how good these lections are. Following you with high interest.

[@christianmusso629]

What a great summary! Loved the explanation of the circuits and the testing on plain paper!!

[@jetblakink]

Excellent. I remember doing this stuff in college in the 1980s. Great reminder

[@ExtremeBogom]

Many thanks Richard for yet another great tutorial. The diagrams help immensely!

[@LearnElectronicsRepair]

You're welcome

[@peterlethbridge7859]

Absolutely brilliant video, thank you so much for the effort put in. I've been watching so many transistor videos and your is by far the easiest to understand. Thank you,

[@spelunkerd]

Great review, that was fun. I know you don't like that second tester, but if you added three jumper wires with micro clips, it would give more versatility for different sized transistors.

[@guloguloguy]

....WOW!!!!!!!!!! THANK YOU, FOR DEMONSTRATING, AND EXPLAINING THESE PRACTICAL, USEFUL TESTING PROCEDURES, AND TIPS!!!! AWESOME!!!!!!!!

[@eric_d]

20:37 it appeared when you put the big transistor in the cheap tester you may have put the pins into 1, 2, and 1, which would explain why it said diode. I have the same tester, and mine acts the same way if I put a transistor into 1,2,1. Besides that, everything looks great so far.

[@Digithaiz]

Man I say again thankyou for your uploads. Guys / gals you should hit this guys Patreon up if you are using this channel and benefitting. He is giving way more than we deserve!! I wish you had been my tutor at college I would have learnt lot more than I actually did! Thanks again

[@LearnElectronicsRepair]

Thank you very much. Patreons are always welcome and appreciated - it costs as little as €1 a month to support this channel and all money raised goes into buying stuff for the channel to review, or to improve my recording and video editing equipment. You can subscribe and make a monthly payment as little as €1 a month via this link www.patreon.com/learnelectronicsrepair You can send one-off donations of any amount via this link www.paypal.com/paypalme/youtubeLER Many Thanks 🙂

[@WindellChapman-kf4wr]

Played w/ transistors ,mostly as switching devices ,since 1966. Semi retired security sys troubleshooter ... Thanks ever so much for such great memory prodding info ....This is your forte !!!

[@daz41262010]

reached the end of this series and would like to say thanks for posting this series was amazing and will be book marked and re visited another time :)

[@skanderbenmrad946]

a very good lesson, thank you dear collége

[@tasoscyra2785]

Hi ! I really love the way you explain repairs in your videos .Please could you make a video in topic "everything you need to know about ..." about opamps , how they work etc ? I saw an old video about this component and I didn't fully understand how exactly work . THANK YOU !

[@JosephFernandes2017]

You are an Amazing instructor. Thank you so much.

[@bulla8631]

this video it the best thank you to the man that made this videos I loved it the ways he teaches it very clear easy to understand it including a diagram I want to watched all his videos he the master of all in electrionic than my teachers back in the 90s

[@guitarman_3693]

thanks for the vid, if i might say... its hard for me to see so small drawings. & you had a big mosfet when it was like the other, but when you get to the different one ( pnp) you choose a very small mosfet.. and that is where the lesson is at for me.. im still grateful fir the vid. thank you

[@richardredcastle7911]

Keep up the great work on these videos. Well explained and enjoyable to watch.

[@user-rf9me7xm1w]

An excellent presentation, very nostalgic for me as I spent many years teaching on City and Guilds Electronic Servicing courses. But, please use the correct BSI symbols for the basic npn and pnp transistors. Sorry to be pedantic but “if a jobs worth doing”.

[@everythingfreakishandstupi7060]

You sir are doing a FANTASTIC JOB!!

[@kensmechanicalaffair]

Thanks for taking time to educate.

[@hamradioeconomystyle48]

WOW, I learned more USEFUL information about transistors in the first 5 minutes of this than any chapter in a text book. Frankly, saying that a transistor can be defined by the following, x+y/%$#@;:×"#-xcf/=???? Means nothing to me. What gem of information you've explained here. Thank you very much

[@HelgiThorisson]

I have to fix stuff (cheap Chinese car charger "Intelligent Pulse Charger" that keeps blowing a fuse to be exact) and I come to this channel to learn. I now have a clearer picture of what I am dealing with and what to measure.

[@LearnElectronicsRepair]

Welcome aboard 🙂

[@ryumak]

Thanks for the PNP transistor biasing explanation!

[@chris532008]

is it possible in time to determine a mosfet replacement when charts have no interface to existing replacements today

[@maxplanck698]

Very useful video, real info leaving aside the fluff, well done

[@muhammeddanso4436]

Fantastic lecture l have never known much more about transistor b4. Thanks

[@rahulmechatronics]

Very nice explanation !!! 👍👍

[@spicky2966]

love it just need to watch it about a few times to fully gasp all that information tks nice lecture how you started and ended.......

[@dumbluck6180]

Very happy I found your channel. Great stuff!

[@overengineeredinoz7683]

Really learned a lot about diagnosis of transistor faults. Thanks.

[@petersmith5199]

Thanks for your time. Excellent video.

[@petevannuys5642]

Does that work better mostly with some analysis device get more information ?.

[@gregpeirce6121]

very helpful vid, thank you for your work in making these.

[@JoseHernandez-md8tv]

Great tutorial. I wish I had found those years ago. Even that I learned a lot. Please keep going.

[@paparazzo80]

Loved the video..now I finally know how transistors work....is there a video on how to test MOSFETs on PCB??I wanna learn that, too.

[@LearnElectronicsRepair]

AYNTKA Mosfets will be the next video in this series, let's see if i can do a good job on those too 😉

[@paparazzo80]

@@LearnElectronicsRepair Loved the video..just learning from pure theory I never could understand how transistors work...you showed us in practice and it was hell a lot easier...

[@flinfaraday1821]

At around 7:20, why is there a reading with positive probe on the base? Does electricity not flow from negative, which then would be blocked by the diodes?

[@davidthompson7334]

Yes it is blocked by a diode

[@tuloko16]

I’ll have to say, after messing with this stuff for a very long time, i was never able to memorize the whole npn/pnp deal. The way you explained it, finally made it “click” to were i know it by memory.

[@71pil]

Thank you very much amazing videos thanks for the info MR

[@DaveLFC1974]

Great stuff love watching your videos, i done basic electronics about 30 years ago these have been a great refresher course , what type of multimeter do you use ?

[@antonypalmer5804]

Thanks, I did not know that the Emitter gave a slightly higher voltage on the diode test. I normally explain a transistor as being a bit like a tap with the handle being the base but I like your explanation when it comes to a faulty transistor. Good video and a great way for me to refresh my knowledge

[@LearnElectronicsRepair]

You are welcome. The reason the emitter has a higher voltage drop is because the two N type silicon layers (in an NPN) transistor have a different amount of doping compared to each other. The same applies with the two P type layers in a PNP transistor. I think this trick of identifying the emitter is something that is hidden in plain sight. You see the small voltage difference every time you test one but you don't think about it's significance. This will very occasionally let you down and you will find some transistors where you can not see a difference B-C and B-E but I never saw one where B-C gives the higher reading.

[@TaeterTot74]

I’m Tae and I love your videos. Trying to learn a new hobby, and I was with you up til 15:58 when you identified the two transistors as NPN & PNP. You wrote them having the same c/b/e setup but they were testing as a different setup. Can someone explain this to me or am I missing something?

[@seguramlk]

Awesome. Tysm for your videos Sir 👍

[@monz7951]

Thank you very much I learnt a lot. Cheers!

[@Salfke]

Very interesting video, very simple and very usefull.

[@castlecodersltd]

Thanks for this, I was looking forward to it. Some helpful tips in here

[@nazeerabdulrahuman9526]

Thanks for the useful video 🌷

[@Therider61]

Some old transistors are hard to find. When you replace a transistor in an amplifier with a different but the best replacement. How do you position and solder the new one with a different pinout. Thank you.

[@posglen1]

Should that be Ve or Vcc on the NPN sketch?

[@Tsjoetenbille]

Good video, looking forward to ‘All You Need To Know About Fets’ ;)

[@LearnElectronicsRepair]

That's coming soon 😉

[@bwm999]

Looking forward to an amplifier tutorial… I’ve got a pair of faulty power amps. Simple circuit (I’ve got the schematic) but it has a DC offset at idle of around 1V and I’m not sure where the fault is. Cheers.

[@Bestline7]

Great stuff. You got yourself a new subscriber.

[@ianuragaggarwal]

Very nice and simple video.

[@stewbeaf3757]

I like your video's do you have anything on audio surround systems, I'm trying to fix a Teac V G1200 receiver the rear channel is not working all front channnels are good is there a rellay involved?

[@bulla8631]

there is a tricky to test electrionic parts in the circuits board let says a transistor is leaking when you pulled out from the circuits board tested good what do you think the tricks is have a gust

[@kironsk7697]

A amplifier's fuse which is situated on the output of a bridge rectifier getting blown off once the power is turned on. Please tell me what could be the reason of it? And I found 34 v DC on the output of this bridge rectifier though primary supply voltage is 26 ac. Is there anything worng with this bridge rectifier?

[@travised]

Amazing transistor content

[@gameofquantity96]

Extremely great channel

[@knightwar3]

Thanks a lot for these lessons

[@elvisleugouetchakam7506]

Hi, I have a transistor IRFP250N P643D 9HX4 What does those numbers mean? Thank you.

[@mohanadmozayk7651]

Thank you so much for that information

[@Dinco422]

Very informative tyvm

[@mrdavek1]

I am working on a failed Dimma2. Resistor getting super hot. There is a 3 pin To-220 package marked TA 425 400. Anyone know what that is as its in line with Resistor cooking?

[@fastacker2]

That little lever on the cheap component tester opens and closes those little slots. You can also simply use the little silver contact pad to the right.

[@s3anuk]

great video! thanks very much for your efforts

[@TheClahey]

Thanks, Prof.

[@karensingh2020]

heres one i have for you. i have a few cassette deck motors. they have a speed control circuit in them. there is a 4 terminal transistor. is it a transistor or an ic? had to put one of these in a getto blaster works well!

[@LearnElectronicsRepair]

Well I need the part number to tell you that. There are some four terminal transitors that I know of, the extra terminal is often a 'shield' connected to the metal case of a transistor and you generally only find this in high frequency circuits (radio receivers/transmitters)

[@karensingh2020]

@@LearnElectronicsRepair cant get the part no as they are in the end of the motors. looked at another bigger motor and this one had 3pins but it is still that same type. the body has a 3 point star hole. no heat sink. these can be either 3 pin or 4.

[@keithdownes2554]

Great video but are we testing ac or dc voltage...

[@nonsuch]

If you ever come across any Germanium Transistors cheap at a boot sale or wherever, you definitely want to pick those up. They fetch quite a bit on ebay and such nowadays. As others mentioned, they are very popular in old and new guitar pedals. And of course, since they aren't being manufactured any longer and needed as replacement parts in many other vintage devices, NOS resellers sell them at a premium.

[@LearnElectronicsRepair]

Actually I gave all my quite large collection of Germanium transistors, mostly pulls, to a Radio Amateur friend in the UK before I left in 2016, thinking I wouldn't need them anymore. These were all devices I had salvaged and kept from the 70s and 80s, and all sorted by component part number

[@nonsuch]

​@@LearnElectronicsRepair Doh! Well, I guess we've all done something like that. I had a huge Star Wars toy collection in the mid 80's and by the time I was 12-13 years old, I felt it wasn't cool to be playing with toys anymore and gave my entire (now vintage) collection to my nephews who ultimately lost, broke, or thrown them away 🤦.

[@jnkmal9519]

This is great! Been working with electronics for years, and I know a bit about what works and what doesn't, but I wasn't sure why. This clarified a lot of things for me. Thanks!

[@IIIElijah]

Peace be to you, You teach very clearly. I thank you. Heavenly Father is calling home the articulate. 8th day is being nearly complete. Servant of The Deeper Mystery

[@make425]

I tried this technique to identify some transistors , didn't work with the red lead but worked with a negative. What does that mean.

[@vinxmod793]

Mentioned Germanium Transistors and just used a 'matched pair' of germanium transistors to create the 'Fuzz Face' circuit Guitar EFX pedal

[@peterdavey2767]

Thanks again the last part was a little confusing due to no B-C-E not being labeled

[@stonerdave]

that 3rd transistor appears to have a free wheel diode - I have one of those atlas tools the DCA 85 I think it is- has a curve trace function when you hook it to a comp through the USB- it is my most used diagnostic tool as well

[@stonerdave]

should have watched longer- its a darlington

[@roseelectronics4582]

The last 10 minutes were enlightening

[@staminaman77]

If you've tried every possible outcome with the black and red probes and can't find two readings. Only one side ever reads and the other always says OL, Does this mean it's a faulty transistor?

[@Akolkar2]

Excellent video PL make video on EV KITS CIRCUIT USING IGBT WITH TESTING METHOD.