57 - Designing a Simple Transistor Amplifier
ฝัง
- เผยแพร่เมื่อ 7 ต.ค. 2024
- Nick M0NTV walks through the considerations and calculations for designing your own simple transistor amplifier. Includes easy maths, clear explanations and practical advice.
If you have ever thought about having a go yourself then hopefully this might help you on your way!
This is part 1 which covers exclusively the DC Biasing of the amplifier. Part 2 will go on to tackle the Small Signal AC Analysis.
My handwritten notes produced live in the video can be downloaded here:
drive.google.c...
Hope you find this helpful. 73, Nick M0NTV
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You rarely find a "how to" video which goes literally step by step. I'm arty not techy and have poor maths... but followed this without too much difficulty. The bonus is that I can replay the video to revise and review.
I wish I had your way of teaching when I took the RAE exam in 83, I passed with double credits but didn't realise you could have AC and DC running on a circuit at the same time! Now I understand not only the "what" but the "why" as well. Thank-you Nick! 😄 👍
Thanks so much as always Ace. I'm pleased it was useful. Look after yourself. 73, Nick
Very good information here to get those projects working, (and the grey matter!) Many people struggle with this very concept and it`s tempting to just grab an op-amp, until you need an amp at a high enough frequency to make op-amps too expensive or not suitable. Everything you need to get you going has been covered in this video. You do a great job to help keep this hobby alive. Chris, UK. (Gentlemen of 1977khz AM)
Thank you very much indeed Chris. I'm certainly not adverse to using an op-amp or two myself but I find there is something strangely empowering in understanding how the humble transistor amplifier works. Thanks again. 73, Nick
Best explanation I've seen. Excellent teaching.
Thanks very much. Glad it was helpful. Best wishes, Nick
Excellent video. Taught much better than my college electronics class. Thanks!
The first time I went through this was 1973. Now I think I have it! Thanks!
Thank you Louis. I have to admit that it has taken me a while to really get my head around all this stuff myself ... and I'm still learning I'm pleased to say. Glad it helped. 73, Nick
Thanks Nick, I watched to the end, and learnt a few things!
Cheers Mike. Glad it was some help. 73, Nick
The explanation starts at 3:12. Interesting video, well explained.
Thank you very much Heinz. 73, Nick
Dear Nick, ...
it could be, that I am the "number 7", looking your excellent 'show' here, ... !
Very interessting video, for all the 'newcomers'!
This would be interested for all the 'new' people looking for the new 'beginners-licence' here in DL, since the last 3 month.
Easy to understand ... and better to listen, I have ever heard before, ... !
Two bridges to go, in only one step!
Learning 'English',
(with your wonderfull and easy to understand speaking!)
and doing the ground breaking 'electronic-knowlegement',
(How does a small transistor amplifier work?)
Side by side!
- Wonderfull! -
The new class is called 'N' in Germany, and so the 'beginners choise', for entering into HAM- radio!
An 'up-date' from 'N', to class 'E' or even 'A', is possible and easy to do!
Easier to work on, and not so 'technical', but also 'restricted' by the output oft the radio, and also the frequencies, that they could use.
So Germany has a 'three class- system' again!
From the 'N' (Newbie/Rookie/Entry- Class) over 'E' the 'in between' class, up to 'A', the top- notch class, where all is allowed, to the legal limits, of corse!
(Hi Hi ! ! !)
The class-'N' only restricted to 10m / 2m / 70cm with an EIRP of only 10W, ... but better than 'nothing'!
This is, why it is called 'Newbie'- or 'Entry'- class!
Better than doing 'illegale transmitting', on or near HAM- radio or CB-radio- frequencies!
The easier the beginning of such new 'licence- courses' is, the better is the 'learning effect', and the number of 'new YL/OM', finishing these 'courses', and become an amateur- radio operator. I hope that a lot of interessted young people will up-date to higher classes, 'E' or 'A', ... so that HAM- radio ha a better chance to 'survive' in the jungle of internet and smart-phone euphoria! People are getting lazy, over the last three decades.
---> " One small step for a 'swl', but a giant leap into 'HAM- radio' ! " - something like that, ... !
Hi Markus, Thanks very much indeed for your kind words. Thanks also for filling me in on the Licensing changes in Germany - I wasn't aware this was happening. Hopefully it will encourage a few more folk to give ham radio a try. Please don't apologise for your English - it is MUCH better than my German! Nochmals vielen Dank. Machs gut, mein Freund. 73, Nick
Very helpful - thanks for going through the calculations !
You are very welcome. Thank you for watching and commenting. 73, Nick
Yo dude, at it again with another amazing video!! You got me scouring YT for more, absolutely love it!!
Thanks Ed! Glad it was useful. Hope you're doing OK. Best wishes, Nick
Long, but not long winded. Excellent ! 73 PE1LLA
Thanks very much Jacob. 73, Nick
What a great video Sr. Thank you very much for the simple explanation I really appreciate it . I have assembled the simple transistor amplifier from the video 56 using my breadboard and I am truly happy, is the first time that I build something that is not some kind of a blinking led =D, the amplifier works great. I don't need your notes, I have copied everything to my notebook while watching the video hehe (lots of pause and watching again =)
I can't wait for the next.
Thank you
Hi Joao, thank you very much. I'm pleased that the video helped and very well done on breadboarding the amplifier. Take care. 73, Nick
you did a better job than my physic teacher
Hi William, thanks very much for your kind words. I'm glad it made some sense! Look after yourself. 73, Nick
Thanks Nick. Enjoyed this video and looking forward to the on the AC portion.
Peter ve3poa
Cheers Peter. Thanks for watching and commenting. 73, Nick
Nice explanation Nick,
It's a fairly easy process, but not that easy to explain to people coming into the task cold.
This brings back so many memories of my first year electronics at college, with one exception it was ALWAYS hfe, never beta! which was reserved for those funny glass things with hot red leds in the bottom of them. 🙂
When you get to explaining the emitter bypass cap in the next episode, I will have a vision of my electronics lecturer (Mr Jones) jumping up and down on the spot to drive home the point of how that cap affects the gain.
At the end of the day we also ended up just using the half supply rail voltage across Rc and 10 x the base current through R1 and R2 - It works.
Andy
Cheers Andy. Yes, it's true that sometimes the simple rule of thumb is more than sufficient! Thanks for watching and commenting. 73, Nick
Thank you! Greetings from Belarus.
Thank you very much. Glad it was of some interest. 73, Nick
Hey Nick, perhaps a simpler way to explain collector bias is simply halfway between Vcc and Ve... You got there, but you kind of went the long way around.
Hi Dean, thanks for watching and commenting. Yes, you can do (Vcc-Ve)/2. But when am I ever going to pass up the chance to go the scenic route?!! 73, Nick
What spice program are you using? Very useful information.
Thanks very much. I'm running LTSpice (on a Mac). It's free and there is a huge user base which means plenty of people to ask when you get stuck! You can download it here:
www.analog.com/en/resources/design-tools-and-calculators/ltspice-simulator.html?ADICID=PDSR_EMEA_Power-Management-LTSpice-NB_Google_Mult_202410&gad_source=1&gbraid=0AAAAACxqTx93ynCBN7P6ldtCDjBRBLK1q&gclid=Cj0KCQjwjY64BhCaARIsAIfc7YaCGr6t1mqlAvB6tgAb2VrqlOZJROvEP4T6aBsGwbSzZyeJz50zHy4aAkR4EALw_wcB
(12:(16+3.3))×3.3=2.05 V; 2.05-0.7=1.35V;
Not enough for class A amplifier.
(12:(8+12))×12=7.2V.
2n3904 will be burned.
Hi Mike, thanks very much for watching and for sharing your thoughts. Best wishes, Nick
Your notation is odd to me please explain further.
@@andymouseWith such resistor values, V of the base will be 2.05V (1.826 V LT Spice). This means that a signal with an amplitude higher than 2.05-0.7=1.35V will be cut off.
@@andymouseIn the scheme of the emitter repeater, the voltage at the base of the transistor is V=6.746 (LT Spice). Such transistors do not exist in nature.
Greetings from Ukraine.
@@mikepaul2831 Thanks :)
Top Nick! Iu2paq
Thanks very much Alfredo! 73, Nick