Excellent! Excellent! Excellent! I love your very detailed, informative, and easy-to-understand videos! Thank you for your hard work!

Teşekkürler. You are a real Wizard regrading of explaining things easy and understable. On top sympatic and honestly.

I am already loving your videos. The most important things I am loving is that you also tell us why we are using a specific value. Hurray🎉

Awesome! You're a great teacher, I have learned another thing or two 😀👍

Good video! I like the fact you explain what happens if various values are too high or too low. I'd prefer if your DSO was displayed horizontally instead of down the side of the screen

یکی از بهترین ویدیوهایی که توی عمرم دیدم ممنونم ازت ❤❤❤❤❤ لطفا اگه فرصت کردین ویدیوهایی با همین سبک بیشتر بذارین (مثل فرستنده و گیرنده)

One of the best explanations ever on this topic. Thank You. 👍🏻

excellent way to teaching electronics to newbies.👌 Thank you so much Ardabilli ghardashim

I love you explanation very good teaching video. Thanks

As always, very well explained. I like the way you also explain why you choose particular resistor and capacitor values and the effects of changing them.

Very instructional and useful. Thanks!

you should have mentioned, for the beginners, that it is not a good idea passing dc current through a speaker not only for heat dissipation but also to decreased efficiency of superimposed ac signals ans since in the emitter follower shown here it is the speaker that determines the quiescent current of operation it may be quite large depending on its dc resistance.

interesting to see our man, like myself, doesn't agree with labelling little drawers. fascinating! i have learned so much from this chap.

Another fantastic video, explanation very easy to understand!

This video is great, as are your other videos - thank you!

First time I completely understood every aspect of the circuit and the role of every component. Really great learning material!

Great video. I think this is set at the right level for people new to electronics, and want to have a go. Keep up the good work.

You are fantastic! You explain these concepts better than any video I have ever seen. Thank you.

Bro I really like and appreciate you. God bless you richly!❤

You are an amazing man thank you for your effort😊😊😊

Great job! Please keep the videos coming! Very well explained.

Outstanding. Now I'm heading to my junk box to find some salvaged microphones and speakers to breadboard on the scope. Now I can't wait for the IC version and the extra goodies that come with using ICs

Thank you sir, ❤ from 🇧🇩

So much knowledge omg 😮

most detailed video on transistor application, includes both theory and practical at same time, awesome video🤯🥳

Thank you. Another great video with easy to understand explanations. Would it not be wise to put a small 1K resistor on the middle pin of the 50k pot so not to turn the 50k pot to zero resistance and allow full current to pass through the pot to the base emitter junction and burn out the pot or the transistor?

Stunning explanation. Much appreciated.

Great video! Thanks again!

Thank you so much for this 😩

Excellent! Thanks for making this!

Great video.....❤.... Sir... Please make and explain a video on very simple FM transmitter circuit ...❤.... Thank you sir...

Good video.. Keep going ❤

you're the best

Extremely well explained video. I haven't found anyone else giving this level of detail, which really helps. That said, I had eveything up to the adding the last transistor. I would have thought the voltage as point C would be too great to drive the base of the second transistor, so it would be in saturation mode?

Super..! You are simply great..!

such a good video. you really answered all of my questions as i was following along like why 100nF? and why 50k pot? thank you fro the clear explanations.

Thanks

Gooood stufff!!!👍👍👏👏

I am interested in electronics from childhood

can you make a video on how inductors work and their functions, also very good video, thank you

💖💖💖💖

Very impressive. I love your video. You made the concept that was hitherto pretty strange to me to become clearer and easy. But then, how do I drive a big loud speaker ?

Can you do the same kind of thing but for RF frequencies? An RF amplifier for say 20Mhz?

Very nice, was easy to follow along, even the biasing part but the 2nd transistor kind of threw me off. Why is the currnet amplified int 2nd transistor and the voltage amplified in the first one? why isnt the current amplified in the first one? oh yeah the 1k resistor. You said there are many disavantages to simply using a low value resistor to allow enough current to flow, but didnt mention any heh, was curiouse to know, anyway, thanks for the great info.

Hey bro, what's the model of the LCD monitor you have hanging on the wall?

At 19:20 - no. Any decent capacitor will _completely_ block dc voltages. A smaller value capacitor will not "improve dc blocking". It will, however, allow lower frequency ac signals to pass more easily. There's no reason to guess the value of the capacitor. For audio applications, you just need to pick a coupling capacitor that has an impedance at 20Hz roughly equal to the input impedance of the next stage, which is the lowest frequency of interest for audio. A 100nF capacitor has an impedance of about 80K at 20hz; a 1μF capacitor has an impedance of about 8K at 20Hz; a 10μF capacitor has an impedance of about 0.8K at 20Hz, and so on. Your choice of 100nF would normally be considered too small, unless you deliberately wanted to block bass frequencies. At 14:00 - no. You'll find that 400mV p-p will definitely produce sound from one of those small loudspeakers. But from an ac point of view you've just connected 16Ω across your voltage divider which has an equivalent resistance of around 1K, so you're now loading the signal and reducing it by a factor of about 60. No wonder you can't hear anything from the speaker. Your test only proves that you need to drive a speaker from a _low impedance_ if you want to draw any meaningful conclusions about how much voltage is needed to hear anything. At 17:10 - no. The relationship between Base-Emitter Voltage and Collector current is *not* linear. You're reading off a graph where the axes are *logarithmic*. In fact the collector current increases exponentially with base-emitter voltage. At 19:50 - no. To choose Rb1 and Rb2, you cannot set "one of them as you desire". Those resistors determine the input impedance of the stage, so your example (pick Rb1=1K) would give an input impedance of less than 150Ω. That would significantly load the microphone and you'd lose most of your signal. Using a potentiometer to bias the transistor runs into the problem that you could accidentally have it at the maximum extreme so that you get the full Vcc applied to the base of the transistor. If your PSU has no current limiting, you'll burn out the transistor. Put a resistor of several kΩ from the Vcc to the top of the potentiometer to avoid that problem. At 28:14 - the problem with the emitter follower stage is that the speaker now has a dc voltage of around half of Vcc across it, since the Vbe of the second transistor will only reduce the dc voltage at point C by about 0.7V. We don't want a dc voltage across a speaker, so we need to block the dc with a large capacitor. Generally we'd expect to see 1,000μF which has an impedance at 20Hz of about 8Ω. That means we'd need a low-value resistor from the emitter to ground to bias the transistor. The UTC version of the 2SC945 has a maximum collector current of 150mA and a maximum power dissipation of 750mW (if you can heatsink it to keep the case at 25°C, otherwise more like 250mW without a heatsink). So we shouldn't set the emitter current more than about 75mA for the second stage, giving a quiescent dissipation less than 200mW. That gives the resistor required a value of about 33Ω.

I had no time to watch entire video, but im interested how to make 10, 20, 50W or even more powerful audio amplifier? why some amplifiers have 1-3 transistors and some of them have 5 or more but the W output is same/similar with less components?

A resistive microphone is strange. It should be mentioned, that there is allready an active device inside the microphone, which converts a voltage signal from an electret device into a resistance signal.

Noob question, why the resistor, 2.2k or otherwise? Why not just connect the mic directly to the voltage source (5V)?

دادا ویدیو انگلیسی تا دلت بخاد هست تو یوتیوب شانس ما یه ویدئو خواستیم نگا کنیم درمورد امپلی فایر اونم داره انگلیسی صحبت میکنه 😅😅عجبا

Bad circuit, no working.

Thanks