Transistors in a Nutshell - Part 1 - The Diode

[@RectifiedMetals]

Nice Tony! You start telling people they take a piece of silicone and you dope it with a P material and a N material, the junction is non conductive, but you pass current … and they think you landed from outer space. 😂😂 This was awesome. I loved your real world explanation and practical use. I don’t even remember getting that much in class. Not only does it brush up on my fundamentals, you also gave another way I can explain it to a new student. Not that I am a teacher.😂 Thank you Tony.

[@TheTrueVoiceOfReason]

Thank you, Tony, for being the friend/mentor/teacher to those willing to listen and learn. It really does take someone with a passion for the subject AND for the people, to share of their time and knowledge, all for the improvement of those involved. You have that passion. I also want to thank your cousin ( I believe that was the relation ) who took you under his wing and fanned that ember of curiosity. Let's keep it alive and burning bright, that others may learn and grow.

[@WECB640]

Tony, this video is worth its weight in gold! Very well constructed, logical and easy to understand. BRAVO! I'm looking forward to the next in the series. 👍

[@Parkhill57]

I didn't like silicon diodes and transistors because they weren't as convenient as pluggable tubes. One day they sent us a bunch of tube replacements that contained transistors, for our radar STALO (stable local oscillator). Wow! pluggable transistors. Those things lasted years compared to tubes months. Plus the frequency was very stable. So much so, that less noise was seen on the scopes. These radars were only recently replaced by the FAA.

[@g.fortin3228]

Wow the breakdown of the spec sheet was great ! And the explanations..you are a true teacher. Helps a lot Tony, just in general understanding as I use the spec sheets to find proper subs. Thank you , as always !

[@BasicJ]

nice one fella, clearing things up in my foggy old man basic knowledge

[@jeremiahchamberlin4499]

The issue with the depletion zone is that it forms naturally: the holes in the positively charged material are attracted to the electrons found in the negatively charged material. Thus, the material near the junction returns to its pre-doped, non-conductive state. The voltage applied to each side of the junction must be great enough for the electrons and holes to ‘jump the barrier’ across the junction so that the semiconductor device can conduct from anode to cathode, but the barrier voltage remains as long as the device is forward biased. Reverse biased, no conduction, and source voltage is read across junction, as demonstrated in your video. Good show.

[@brucedowd2501]

Thankyou Tony - excellent video - looking forward to Part 2 , you cannot hear this info too many times 👍

[@Jehelectr0]

excellent refresher vid!!!!! I love it!

[@markpuddephat2916]

Excellent video. Looking forward to the upcoming videos on transistors. Please consider covering other discrete devices, Tony. You explain the theory very well.

[@ingagiorchestra]

This is a fantastic series and extraordinarily helpful for somebody who is just learning this stuff. Thanks so much, Tony!

[@philipslighting8240]

That Rectified The Situation.........🧐

[@Amplified208]

Love the video nice a simple.

[@alexw890]

Very helpful Tony. When it comes to finding replacement rectifiers, can you increase the maximum reverse voltage? Would it be an upgrade to just use the 1N4007 type?

[@greengrayradio1394]

Instead of having several types of diode you can stock just 4007's and just use those instead as 1A rectifiers. Works as good as say a 1N4001

[@montech5647]

Awesome video! I wish I could see the "goodness" of a transistor. Llike the 2SC2240 vs. 2SC1775 vs 2SD786, which is lower noise/better?

[@kennethiman2691]

Tremendously helpful!

[@YoutubeSupportServices]

4:13 ish... How am I suppose to know the degree the resistance should stop at? And is this measured in Farenheight, Celcius, Kelvin, or...? .. Seems like you should... know I'm fkn wit cha!...😁

[@tutaikoley1109]

I am only confused about a point I know ,sir tony explained that forward voltage drops vary depending on current,temperature but while testing for volatge drop with the IN4007 diode,and measuring the voltage drop by the backlight led tester(yellow box one) it showed the presise 0.7v forward voltage drop at 323 volta but when testing with multimeter, with 3v ,Vdrop≈300mV and with 9v, Vdrop≈800mV. My question is why at low voltages, forward voltage drop is fluctuating while at higher volts(eg-323 V),such precise 0.7v voltage drop PLEASE EXPLAIN...

[@kendarghi1046]

Nice start!

[@garygranato9164]

thank you tony

[@SBWings]

Hey, Tony. Is hey for horses or is it hay? 😀I really enjoy your videos and I've learned a lot by watching them! Your explanations are clear and easy for those of us who are fairly new to electronics. One thing I noticed on your diode diagram is that I believe your + and - signs are reversed. Isn't the P-type anode positive + and the N-type cathode negative - ? In a future video, would you address component choices when building a project? Usually, people only talk about checking components to be certain they are within tolerances, like 1% resistors, etc. I know it depends on the component use as to which attribute is better, like forward voltage, reverse current, etc. For instance, if I have a dozen germanium diodes, are the ones with the lowest forward voltages the most sensitive for detecting RF? I'm building the capacitor foil foil sniffer from RestoreOldRadios (I'm sure you're familiar with it). The Arduino compares the two noise signals between the leads with a 1N34A germanium connected to each lead. It latches an LED to the "ON" position when to the side with the lowest noise detected.

[@andymouse]

This can be confusing in itself because it depends on whether or not your talking about 'conventional current flow ' or 'Electron current flow' sorry I bet that hasn't helped a bit !

[@petertimp5416]

Thanks Tony…I was hoping you were going to let its ‘spirit’ out!!! So ppl can see what happens when the magic smoke is released and how you can’t put it back in😊

[@dorelgogu8631]

Hi, Tony! Thsnks for the video! A small correction, you can use the 1N4007 in high frequency, but only as "poor man's" varactor 😊

[@xraytonyb]

Interesting. I never thought to use them in that way. Additionally, the UF4000 series is the same as the 1N4000 series, except they are fast switching. In addition, the UF4001 - UF4004 diodes work well as thermal tracking diodes in bias circuits. Thanks for the comment!

[@ekbanjosworld4926]

The color code on resistors really sucks when you're colorblind!

[@YoutubeSupportServices]

AND now you can become a billionaire with your idea that I just had for ya!.. "FLAVOR-CODED" RESISTORS!...Yeah?.... Hey!.... 😧 Throwing a hammer at me isn't a very nice thought!... 😑Maybe a; "Thank you for the great idea." would have been more appropriate!

[@xraytonyb]

One of my co-workers is colorblind. It has sometimes been a challenge for him, but he always seems to have a workaround. The only time I can remember it being an issue was about 27 years ago (mid- '90s), he was working on an arcnet based x-ray system with a ton of boards. The filament control boards had two LED's - one green and one red. Green meant the board was functioning properly and red meant the inverter mosfet was faulty. He misread the LED and skipped over the problem. When I came to take a look, I saw the red LED and we fixed it. That was the only time I can remember it causing him to miss something. Really smart dude! The fluke meter was his friend for the resistors :)

[@paulpaulzadeh6172]

Nice , but you didn't tell why with multimeter it was 500mv and with 9v battery in serie with lamp it was around 800mv !!

[@xraytonyb]

Forward voltage drop increases with an increase in current or temperature. I demonstrated it in the video. Hope that helps. :)

[@andymouse]

Just a little nit pick ! your drawing of a diode showed the anode to be negative and cathode to be positive (electron flow) and the circuit diagram shows us the anode being positive (conventional flow) also the actual circuit isn't the same as the diagram as you have the bulb connected to the anode and the diagram has the positive side of the battery connected to the anode so my point being that could lead to confusion in a video about the absolute basics and perhaps you should only make a passing reference to Germanium as one volt drop is enough ? and you didn't explain why you showed 500mV drop with your meter and 800 mV across the diode and its due to how the meter measures it ...just sayin ! love your work...cheers.

[@ralphj4012]

The challenge is that, in any accurate description of the behaviour of semiconductors, batteries etc, electron flow is likely to be discussed. This can open many cans of worms and sometimes even confuses me, despite fifty years in design.

[@andymouse]

I really don't think at this level it should be mentioned it doesn't need to be, the diode blocks one way and current flows the other way and the anode is positive and that's it! I have more years than I care to mention and still get caught out too !! besides my little gripe Tony makes a fine tutor :)@@ralphj4012

[@jdmccorful]

Good lesson! Thanks.