A New Amplifier Build and Speakers / Listening Room Update
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- Опубліковано 19 гру 2021
- I'm taking a detour and making a 2 channel class AB amp to power my subwoofers. Since I already have the amp boards I designed, made and tested10 years ago, the bulk of the project will be building the chassis / case.
The transformer is a 540VA toroid that puts out 102VAC CT, and that translates to around +/- 73VDC. I may switch this for one with a lower voltage, if I have one that's big enough.
The amplifier circuit design is based on the Luxman M-02 folded cascode. Of course, all of the very excellent transistors that were available when that amp was first designed are now obsolete and long out of production, so I had to find suitable modern replacements for them. But that was 10 years ago and even some of the ones I used that were available then are obsolete today. I'm pretty sure I have enough of the ones I used originally to complete the second board to give me a stereo pair.
I do need to make the power supply, but that is fairly simple.
The chassis will be made entirely from 1/8" thick aluminum and that and the heatsinks shown in the video should provide enough cooling.
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I'm taking a detour and making a 2 channel class AB amp to power my subwoofers. Since I already have the amp boards I designed, made and tested10 years ago, the bulk of the project will be building the chassis / case.
The transformer is a 540VA toroid that puts out 102VAC CT, and that translates to around +/- 73VDC. I may switch this for one with a lower voltage, if I have one that's big enough.
The amplifier circuit design is based on the Luxman M-02 folded cascode. Of course, all of the very excellent transistors that were available when that amp was first designed are now obsolete and long out of production, so I had to find suitable modern replacements for them. But that was 10 years ago and even some of the ones I used that were available then are obsolete today. I'm pretty sure I have enough of the ones I used originally to complete the second board to give me a stereo pair.
I do need to make the power supply, but that is fairly simple.
The chassis will be made entirely from 1/8" thick aluminum and that and the heatsinks shown in the video should provide enough cooling.
So nice, John 🤯. I spent a few years running solder masking, chip placers, and wave soldering machines. The house used Eagle for layout. Traction control modules for trains (Bombardier Transport).
How do I learn more about amplifier electronics, I would love to build some of these for audio purposes, for fun!
This looks like a ton of fun to get into. Amps have always been interesting, but I had no idea they were so hobby-accessable. Being able to design your own boards would be next level fun - thanks for posting this!
Getting to be less with each passing year as the easier to handle through-hole components go out of production. A bit more difficult to work with the tiny surface mount stuff, especially if your eyesight isn't what it used to be.
Those carpet tiles really tied the room together.
Lol, dude.
I have that MiniDSP 4x10. I added the digital io board and the volume/selector front panel module. I made a nice enclosure with cnc aluminum and maple. It is very clean and useful for my setup.
Nice work on the amp PC boards.
Thank you John for another great video. I understand what you're saying as I learn the same way! Looking forward to seeing the rest of this project!
What an amazing job you are doing with the room and videos.
If you really want to eliminate floor reflections then carpet really is the best way to go. Ideally you'd use a premium deep-pile carpet with a decently dense carpet pad underneath it, but any carpet will offer some degree of absorption and diffusion compared to a hard surface. Honestly, if I ever have a home where I can build a home cinema with all of the channels then I'll probably end up carpeting the walls and possibly even the ceiling. Drape over some curtains, install some attractive pillars with sconces for lighting, and enjoy, but that's far into the future.
Thanks for the detour John. Merry Christmas.
you are having way too much fun and learn a lot in the process.
now you diy amp also, it is going to be flexible speaker and amp solution in the end, i am sure it all is going to sound great in the end :)
i just bought a multi way plate amp to keep things simple for myself. but i still have my mindsp shd studio as volume control and dsp, i could get some kind of nanodigi product and expand my optine and go with power amps later.
i am struggling with hiss noise at the moment.
I went to college for electronic engineering technology, a three year course close to 30 years ago. I was never into audio but I did enjoy designing and making my own non-audio circuits. I can't remember a lot of the theory I learned these days but I am very impressed with how much you've taught yourself. You are correct that it's best to learn by making projects, coming up with solutions to any problems, testing, re-designing circuits. I had lots of fun doing that sort of thing, just wish I could remember more of it.
A way to look at audio is it's a fun practical use for an interest in analog electronics. There aren't too many other things that you can make that will be as interesting. Maybe motor controls, but certainly not as glamourous.
I believe there are lots of things to build and learn from. I’m a retired electronics technologist and the list of projects I want to design and build is endless. I just finished a dual tracking power supply and a matching dual active load for testing supplies. Next on the list is a leakage tester for capacitors.
I’m finding your videos quite informative. Keep up the great work.
That response level is impressive. A little processing could nail that flat.
I like the way you explain your work. And I can relate to your learning methods. That's why it's good to always have people around you you can fully trust. That can see from an outside perspective. Thank you for really taking the time to perfect your craft.
I've always wanted to get into the nuts and bolts of how amplifiers actually work
I can recommend a couple of books, "designing audio power amplifiers" by Cordell and "the art of electronics" by Horowitz.
John,
I would love to get into amp design, and it seems you're a few steps ahead on just understanding all of this. I would be happy to learn along with you and I hope you share the details!
Is there a way for us to get the full details of the amp and how to so we can recreate this product as well? Thanks!
I recently acquired what looks to be an identical Yamaha amp, compared to my Wharfdale, it really seems to lack on the low end. It's nice amp and has optical in, which the other doesn't.
I'm similar with regard to learning. I can put a circuit together and understand 99% of what is happening. If I just sit and read schematics or read about calculations, it doesn't stick... I'm SO ready to build a tube amp (guitar not hifi). I just haven't had time to devote to making it happen (too many projects stacked up). I'm VERY curious to see how your transistor amp turns out. I bet it will rival anything you've had your hands on.
Oh, when it gets into the math, forget about it! I'm a stone wall and I'm eternally grateful for the simulators and calculators that give the answers without me having to work it out myself.
Reading books is the core of the knowledge but the actual practice of building what you read is significantly better experience. I do the same think. I keep books for reference but I love to build and see it work, or fail. And when it fails you often learn something you didn't from the book
Open baffle properly set up, in a nice room does sound better.
I use an ati 1505 to power 4 12 inch subs in my gaming setup. Works pretty damn good. Subs are all 4 ohm and i really gotta crank it to get the distortion lights to flicker. Hard to beat AB designs for taking a beating and delivering power with low distortion. But to get one to put out big power like class d can do would be a mammoth amp.the 12s I use are jbl e250s that amps went bad. Pulled the amps and sealed em up and it works great. All the other speakers are jbl studio series.
How much wattage those amplifier can produce?
i really confused to calculating about how much transistor do you need, how much capasitors are enough and how big transformators are needed????
i hope u can explain this 👍
I enjoy learning electronics as a hobby as well. There is a lots of interesting electronic learning opportunities in Ham radio which has exposed me to it. There are also a great many synergies with that and audio electronics.
Hi John. Splendid efforts as always. Is there potential in the scrap bin or even the home Reno abandoned channel to update us on your basement? I remember (I think) when you originally carved up the basement for utilities and a electronics workshop, but not entirely sure how that migrated to the current listening room. It’s a bit nosey I appreciated that, but would be neat to see the evolution of the space from someone that really dug the home Reno channel, and the stairs in particular! Thanks for all you do.
Very nice!! Any idea what causes the 2nd harmonic peak at 1.2 kHz in the open baffle? Maybe there's something resonating?
Nice video! So, are you just using those amps for your subwoofers? Also, when you build your future amp, will you be biAmping into your Onkyo or will you build a preamp as well?
All of these amps, including the one I'm making, are integrated amps and don't use a preamp.
Sir Can I get complete details of your Power amplifier class AB, schematics to pcb layout and parts placement guide. Thanks
What software did you use for circuit design and layout? Hammond mfg is in your area so they might be able to supply some transformers lol
John, are those measurements with you in the room in the listening position or not? Your body may absorb some frequencies. Newbie here so just a question, not a leading one…
Looking like you are enjoying yourself. And this is what matters the most. With the small heatsinks you are proposing to be using you have me wondering what your bias current will be. Taught electronics from reading and doing like you John. But I haven't built an amp in 20 years. All I can remember that even in the Luxman they had larger heatsinks than that. Bonded fin heatsinks if I am remembering correctly.
I'm counting on the all aluminum chassis to add to the dissipation capacity, much like I did in that small class A amp I built. The bottom, sides, top, back and dividers inside will all be 1/8" thick aluminum and the amp boards will be mounted directly on the bottom panel which is roughly 17" x 16".
Probably run around 40-50ma bias for each output.
@@IBuildIt Bottom line is that you are smart enough to measure transistor temperatures and I agree if you thermally tie in a chassis like you are talking about it will help with the dissipation. I have everything for a set of 6 LME 49810 Lateral Mosfet amplifiers. The double die Renesas ones. Four per channel. Should give me a good safety margin for at least 200watts/channel. Just need to make the time. Even have a large chassis I picked up in China! What's taking me so long!!!!
I have a few of those LME's that I never got around to using. And they are also obsolete now, so also collector's item's.
@@IBuildIt You can get them if you are a little resourceful. A great idea that was axed because of internal company politics.
I am too stupid for this video, but I watched it anyway.
Hey John, I know its been a bit since you made this video; if its not too late for you to see this. I just found this stuff and I really like it. You said you were using some software to do your circuit design and were able to test it and I assume you are also using some pcb layout software as well. I used some stuff like this a early in my career when i was an EE before i got sucked into software. This stuff was super expensive at the time. Would you be willing to share what you are using? I'm interested in designing and and making a crossover.
Interesting.
I have done something similar.
But do you not considering amplifier "Gain"?
Each amplifier has most likely diffrent amount of gain.
So if you measure and adjust with miniDSP and REW that each amplifier making their speakers to play at the same loudness as the graphs you showed.
Then if you play louder OR more quietly than the level you used to when you did the calibration with REW.
Then the individual amplifiers will NOT act as one unit one amplifier that have a greater gain will get louder OR quieter then the others that has lower gain depending if you turn up or down..
Is that not a issue? As i understand it you will use 3 diffrent amplifiers. For all the speakers.
Yes I have also OB as I also this far come to the conclusion that they sound superior to the box speakers that I have tried in my treated room.
Thanks for the video.👍
The gain for the three different amps are all close enough to each other that it won't be a problem.
52 volts AC, rectified & filtered, you're looking at 73 volts DC. That's maybe a bit high. I don't know what the limits of those transistors are.
I know, though. They can handle that voltage.
After the rather inspiring acoustics videos this comes up as a project that hasn't been properly thought out. The M-02 does not use thermaltraks and there is little need to complicate one's life with using exotic and not very reliable parts. It's even worth redesigning the boards back to the original Luxman design. The heatsinks shown are also inappropriate. Those were designed for forced air-cooling which clearly is not the intended application here. Even if properly applied they are undersized for this project.
You haven't thought it out but I certainly have. Keep watching if you want to see what I mean.
If you want to get more views show a little skin on your next thumbnail. I guarantee it will work.