The inner workings of an amplifier
HTML-код
- Опубликовано: 1 май 2018
- Ever wonder what's inside an amplifier that makes it work? Or how a balanced cable rejects noise but not signal? Paul shares with us a simple explanation of how all this happens.
I am getting close to publishing my memoir! It's called 99% True and it is chock full of adventures, debauchery, struggles, heartwarming stories, triumphs and failures, great belly laughs, and a peek inside the high-end audio industry you've never known before.
I plan a few surprises for early adopters, so go to www.paulmcgowan.com and add your name to the list of interested readers. There's an entire gallery of never before seen photos too. 
Наука
this series of videos on the board is being fascinating. Please, do not stop.
Love these videos. Would love to see a walk through of a physical amplifier pointing out the real-world components from input to output.
Please do not give this video negative feedback.
You have to give it negative feedback to get rid of the distortion. 😂
Thanks, Paul. It's amazing how much I can learn from such an enthusiastic teacher.
Thanks Paul, you look and sound like my solid state professor from the 80s. Good memories.
I appreciate the technical nature of these videos. I'm actually listening to this one while assembling and testing electronics. I'll have to rewatch when I can pay closer attention.
Sure wish I could see what was "ON Top" in this vid, Paul!
A fine job. Don't underestimate your audience. Challenge is better.
I liked your simplified explanation of differential operational amps. First projects I ever started building when I was getting into electronics and audio were all op amps. Lol. I still have the old Radio Shack op amp cookbook. I am sure that’s what started my career as an audio engineer and repair tech. Paul, please don’t be afraid to do some more in depth videos. I was shouting out answers and saying “no! I get it! Please go on. I think you were getting to the voltage divider and figured we weren’t understanding. Thanks for your videos. It’s refreshing to get simplified explanations to stuff i know already. Keeps me sharp.
Great try to explain this.
A tip is to raise the camera so the top of the board is in the frame. And go much closer all the space behind your back and on the right of the board are a "waste" and you may see more clearly what you are drawing. If you go closer with the camera.. :)
Giv Paul a break I’m surprised he’s not charging for these videos
Optimize isn't wrong, though neither are you. This is really great info that Paul could absolutely charge for without complaint, but constructive criticism isn't a bad thing.
Thank you Paul. Loved this one!
I'm studying E.E., and this is very interesting.
This is actually a fantastic Opamp/comparator video. Great job!
I love this stuff, keep em coming!!! Thanks
Great teachings. Cheers!
You were great Paul, I like it, as all you're posts.
Thank you very much! 👍
Best regards from
Holland.
This is a nice explanation of an amplifier input stage.
Really interesting videos... so much to learn
Thanks for trying to go through a more advanced topic
Great vid!
Thanks Paul
Hahaa, got a severe flashback to my early electronics classes when the teacher jumped the gun and just went wild and drew several transistors, resistors, plus and minus signs all over, with several configurations (Grounded Emitter GE, GB GC) trying to "make us understand" how it worked. Damn, we where just done with ohms law DC and was working through AC and impedance when he started with these amplifier drawings on the whiteboard.
He did not ground us first in understanding of even how a basic transistor works!
Oh boy that was a wasted semester, the whole class was dumbfounded, we could only try to remember to say the right combinations of letters when he pointed to different parts of amplifer designs... no one had a frickn clue of how it actually "worked".
Got a new teacher for next semester, 10 minutes in "This is a transistor, this is how it works: Bipolar types, current goes in here, will make more current flow here to here at a set amplification rate, like 10 times... or several hundred times. It all works like a tap on the wall. So, more current flow in here, on da base, increases the overall flow like a hand turning the knob more blah blah".
Everybody: "ooooooooh, so T H A T was what the other teacher was not explaining to us... for weeks..! yeah... now we get it, carry on lets build that amplifier"
Yeah... teaching is also an art in itself. Crap teachers = dumbfounded kids that can at best repeat verbatim what teacher/textbook say like an excellent parrot but has no genuine understanding of why and what a system does on the whole.
No one:
Me: Yes... I am still angry for that wasted semester even though it was 30+ years ago. That piece of garbage condescending teacher has f--k up so many students over the decade he worked there. I just assumed I and class mates was seemingly "a little slow" for not understanding "the simplest amplifier designs" better. Actually... I wonder if he even understood it himself.
Good explanation. You took some of the "magic" out of differential amplifiers.
you should do a video on how amps work power supply ,preamp,output im building a car amp class ab im hung up on the pwm in the power supply i don't have a o scope to measure i just put parts together and hope they work been lucky so far no smoke haha great videos keep them coming
LOVE this videos. you should do one with the basics of transistors bipolars,mosfets,etc not that i don't know how they work but most people don't and they may learn how they do in a video or two compared to months in school( maybe even a SPECIAL series on tubes)
I learn so much from this video’s
This circuit appears in OP amps and power amps (some very famous ones). It is well worth taking the time to understand it as it is the four stroke engine of the amplifier world. Paul did not show the output stage as it would take a whole separate lesson plus there are multiple configurations. Maybe that will be the next video!
" it's gonna souuuuund likeee craaaaap" I love this guy : )
Might be complicated, but well understood, thanks!!
Your sideways triangle represents an op-amp and a lot of audiophile think op-amps are bad. I have an old preamp that has a cult following for its sound which hides the fact that its op-amp based by sealing the circuit in epoxy. I chopped open one of the circuit modules and found a Signetics op-amp inside. Now this is one of the best solid state preamps i've ever heard and I own one but its a good bit of work to get it working right as Its direct coupled and puts out a lot of DC when its not working right. i rebuilt the modules using the same op-amp but adjusted it for close to zero volts DC out.
Like any other components, op amps are not intrinsically bad, but must be designed into circuitry by experienced and knowledgeable designers, or the results can be very poor. Op amps available today cover a wide range of performance regarding many different aspects, and half of the design battle is understanding which ones are suitable for your design.
Further, what many audiophiles fail to understand, is that many if not most discrete amplifier designs are built on the same circuit principles as IC op amps.
Lol I’m 19 and I understood that
What made me understand wat u were say was first explaining how a balanced audio works once u showed wat was happening with that everything made a lot of sense lol the light bulb came on lol
GrimaldiScaleKustom Im still guessing at the lesson. My light bulb is only on dim. Bits and pieces, bits and pieces!
I actually got it Paul.
A valiant effort. I've ran into that quite a few times. Where you start and explanation and realize that your audience may not have the fundamentals needed to follow.
I was able to follow you through the diff pair but I believe only because a recent video by RSD Academy on Small Signal Amplifiers gave me the understanding to follow and see the added value of the op amp internals. Op amps are now less of a mystery to me. I could use them but didn't really understand the inside of the black box.
I think i overstand what you say Paul.
do you think that Cerwin-vega! makes good speakers? like one of their newest HIFI speakers like the XLS series
You were struggling Paul... lol !!
The theory behind Diff amps is rather hard to explain I know .. but at least you gave it your best shot ....
I take it those two transistors are replaced with triode vacuum tubes on the BHK series amps ...
Can you tell me why Bascom opted for mosfet outputs and not bipolar ? The latter are far quicker ( slew rate + stability )
Mosfets arguably create a more musical than bipolar amps, Bascom actually stated in one of his videos that he prefers the sound mosfets produce. They are also more stable with temperature, having a tendency to reduce power through the device as they heat up because RDS (resistance drain to source) increases with temperature. Mosfets also switch much faster than bipolar do and therefore have the higher slew rate.
the input ltp need two bjt's with the same junction ,Paul
The explanations are great - but a little more planning would help. Before you explain this difference amp, maybe you could explain a basic transistor, like you did at the end. The difference amplifier is much easier to explain if your audience is clear on how a single transistor works - as very simple amplifier circuit.
very nice
you tried your best
please don't stop making these kind of videos
i know you can do it better...
Can explain as VR to transistor.
got it, Paul
I just did a bong hit Paul. You lost me about 5 mins into the video.Hahahahaha . Love you man
i have 2 subwoofers that are 360 watts RMS AN 720 PEAK each...I HAVE A CROWN AMP THAT PUTS OUT 1100 WATTS BRIDGED AT 4 OHMS ..WOULD THAT BE ENOUGH POWER ..?THE SUBS A DUAL 4 OHMS..THANKS
john smith is that 1100 max or rms and at what ohm... And what ohm are you gonna run? With 2 dual 4 ohm voice coils you can run anywhere from 1 to 16 ohms.....
i think its is peak power but not sure it dont say...going to run them at 4 ohms......and its 1100 watts at 4 ohms..
john smith if it is the xls1000 you have 215@8 350@4 per channel 1100 bridged according to amazon. I would assume it is peak. I would hook up just one at 4 ohms and see how it sounds. It will tell you if it is too much.
yes it is the XLS1002 CROWN AMP....DO YOU THINK I WOULD BE OK IF I JUST HOOKED IT UP AT 350 WATTS AT 4 OHMS..?INSTEAD OF 1100 WATTS BRIDGED...?..I ACUALLY HAVE 4 OF THESE SUBS SO I HAVE TO BUY ANOTHER AMP TOO...THANKS
john smith on crowns website it says 550@2.
I would hook one sub at 4 ohms to the amp bridged. And hear if it is too much(it will knock loud) then if it is not hook the sub up at 2ohms and do it again. You might need the xls2002.
good stuff
Op-amp
Isn't the same, as an Op -Amp, Paul?
Better to control the bass mechanically (acoustically).
Paul, you need a 360-degree video camera so that we can see the TOP of your whiteboard.
Yeah, that's not going to look awful at all...
Yep too complicated, but we will get there Paul!
Going a bit more in depth is not a bad thing.
Plenty of videos on RUclips are about basics already 😜
So in effect you're describing NPN and PNP transistors?
Need to raise camera please...for next video....chopping off top of schematic
the vids are ok. it's not your fault if heads explode, including mine
I didn't understand, but I always wanted to know how a amplifier works
1:44 sound like a sheep funny
This is a real engineer talking. Too bad it's mostly wasted on those with a sow's ear but $silk$ purses.