Making logic gates from transistors

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the best thing about this guys videos is that he dosent waste time at the begining of the video, he just gets right into it

roryhemmings

Your paper moving skills are off the chart

aedanyates

0:00 - basic transistor
2:25 - inverter
4:14 - and gate
6:08 - or gate
7:38 - *NO* gate😀
8:29 - xor gate
11:50 - whole list

mutalibgozalov

Discovering your channel is the best thing that has happened to me in a long time. As an EE student who just got started on learning basic digital logic and circuit design, this has my mind blown. Thank you for your videos!

cfopeter

that unedited part at 7:38, pure chill.

can_uysal

15 years experience as a control systems engineer ( specifically PLC's)and now I finally get it ...Ty!!!

LogikalMindset

Till date the best explanation of logic gates using transistors. I wish I had got this 18 years back

higigls

Just came across this vid by complete accident. Absolutely brilliant. I’m in my 50’s now and learnt logic gates almost 40yrs ago during computer studies BUT was never shown how to use them in practise with electronics so I never made the connection between 0 and 5v etc. Electronics ended up as a bit of a dead end subject for me and I went in a completely different occupational direction. I’m now retired and really enjoying getting back into electronics and have thought about trying to work these logic gates out for myself. You’ve not only beaten me to it but explained it really well. Thanks very much! 👍🙂🏴󠁧󠁢󠁷󠁬󠁳󠁿

stuffoflardohfortheloveof

Resistors used on base: 1k
Resistors used on collectors: 100 ohm
Transistor model:2N2222
Led: green at 1.2 volt
You can use white led at 3 volt

The modern silicium transistors have an incredible dynamic range. When OFF, the collector/emittor appear like a very high resistor of more than 50 Meg ohm.
When ON, the same two pins act like a low value resistor of about 0.1 ohm.
The expression 'semi conductor" is misleading. The material conduct as good as the best metal, copper, in the ON state and act as an excellent insulator when off.

The first transistor made with germanium were not as good. In the off state, there was a current leaking from collector to emitter equivalent to about 10 k. When the transistor was warm, it leaked like if it was a 1 K resistor. The OFF state was not that strong neither, cold or hot.

About the NOT gate:
The explanation is as follow:

When the transistor conduct, it is able to act like a very low shunt resistor of approximately 0.1 ohm. It can force the voltage to go as low as 0.2 volt, which is much lower than the usual voltage drop of a diode, 0.7 volt.

If you take a voltmeter, you will measure:
Emitter = 0 volt
Base = 0.7 volt
Collector = 0.2 volt

The base/emitter pins of a transistor are simply a diode with the usual voltge drop of 0.7 volt.

A green LED need about 1.0 volt to turn ON. If you apply 0.8 volt, you get no light at all, not even a feint glow. So, since the transistor can lower the voltage to 0.2 volt, the LED is off. However, if you replaced the LED by an incandescent light bulb, you would see a feint red glow when the logic state is "0".

moiquiregardevideo

I love these videos. Ben has a special talent for being able to speak very quick and clearly at the same time. It's like speed reading interesting content

simong

If you are still not a professor please... Became It! Best lesson of transistor i ever heard!

lucaguitarplayer

dude your videos are perfect. You show the schematics, boolean truth tables, and physical breadboards to prove it all right there.

NineInchFailz

I took a computer hardware architecture class in college and we briefly discussed and/or/not gates which I kinda got - your explanation totally cleared it up for me. I definitely had an A-HA! moment watching this video.

susiesan

I loved the silence around 8 minutes.
It felt as though he was giving us time for it to sink in.

Brilliant!

TheDJRiffin

I wonder why isn't this channel popular, This channel deserve more than this

mikeshane

And that, my friends, is how computers work!

Now that I know this, my next challenge is how to get 1, 5 billion transistors into a cellphone...

Could be a bit tricky....

Jokes aside, as a retired Civil Engineer dabbling for the first time in electronics as a new hobby, this video and style of teaching cannot be overpraised.

Well done Sir!

Much appreciated!

bertkutoob

This is the simplest and most intuitive explanation of a transistor I have ever seen. Very good work.

MamoonSyed

I love how consice he is, his understanding, and his presentation, is this guy a professional teacher or something?

scoopasoop

Finally a video where I could clearly understand what transistors actually do and why are they so important. Thank you!

TheLeAlan

6 years late, but this video really helped me understand how transistors work in logic gates! Thank you so much :)

absurd_derpeta

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