Building a Workshop Amplifier with Audiophonics Module - Stereo LM3886 Chipamp.

  Рет қаралды 8,965

Electronics Old and New by M Caldeira (Electronics Old and New)

Electronics Old and New by M Caldeira (Electronics Old and New)

Күн бұрын

Пікірлер: 79
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
Where’s my “Dislike” fan? Can’t believe I may have lost him. I sure hope not. 😊
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
He came! Oh Yay!
@SheikhN-bible-syndrome
@SheikhN-bible-syndrome Жыл бұрын
I think the algorithm does it
@SheikhN-bible-syndrome
@SheikhN-bible-syndrome Жыл бұрын
That frequently response is incredible I've never seen a amp do that good over that wide of an audio band
@electronicsoldandnew
@electronicsoldandnew Жыл бұрын
👍
@OliverWoodphotography
@OliverWoodphotography 4 жыл бұрын
Those LM chips are amazing. I built an LM3875 amp a few years ago, still use it now, very good sound. Next I think I will try one of these, the 3886 is supposed to be the very best linear amp chip you can buy.
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
I also used the LM3875 for quite some time without issues. This one is amazing as a test amp.
@__Dude_
@__Dude_ 4 жыл бұрын
Hi Manuel, after some thought I decided to buy the same amp board! I am rebuilding (not restoring) an old Monacor SA-500 amplifier, which I aquired some 50 years ago. The specs were horrible (e.g. 10% THD at 20 Watts), so I decided to gut it and just leave the enclosure and faceplate as it was. I was thinking about taking one of the low cost class D amp boards, but the one you found is an "analog" one, for the same price. Hard to believe, but then you tested it, and it looks to be great. And it includes the power supply as well. So thank you for this find!! 😊 😊 😊
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
enjoy
@electrosoundaust
@electrosoundaust 2 жыл бұрын
One word - wow. I hope they ship to Australia!
@electronicsoldandnew
@electronicsoldandnew 2 жыл бұрын
I think they do. This thing has been in use for some time now, and has not let me down.
@mackfisher4487
@mackfisher4487 4 жыл бұрын
Excellent job Manuel, I really like your rail method of hanging your homebrew test equipment accessories well thought out.
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
👍
@waynethompson8416
@waynethompson8416 4 жыл бұрын
You absolutely blew me away with this amp!!! My chin hit the floor! 1Hz to over 100,000.00 Hz FLATTER THAN A PANCAKE!!! I hope that you put the model number, address, etc. so that the rest of us could order one of those! I am mega impressed!!!
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
i’m actually quite shocked myself. I keep wondering if I was seeing right.
@paulpaulzadeh6172
@paulpaulzadeh6172 4 жыл бұрын
Could you measure THD, open loop BW , clipping at 20k sinus wave , your measurement is simple , what about load with capacitive , inductive load , you need AP555, To do some serious measuring
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
I’m a defender of the KISS philosophy 😊 Way too complex for my needs.
@DerekHerbst747
@DerekHerbst747 4 жыл бұрын
Your lab is taking shape rather nicely. It probably consumes one quarter of the power mine does. Almost everything I have is tube technology 🙂
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
Wastrel! Probably all the SK2’s you’re testing 😊
@danielsaturnino5715
@danielsaturnino5715 4 жыл бұрын
One more tool in the shelf :) and a good one it seems.
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
Sure is
@petercornell2002
@petercornell2002 4 жыл бұрын
Great vid, thanks. Excellent specs on the amp! Peter
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
thanks
@xyredmax
@xyredmax 2 жыл бұрын
Wow, have you seen how much these are now!
@electronicsoldandnew
@electronicsoldandnew 2 жыл бұрын
I’m afraid not. Hope I didn’t contribute to a price rise 😊
@preiter20
@preiter20 4 жыл бұрын
Does Manuel need another amplifier? "You are not my wife"! This made me legitimately lol. I needed a good laugh today. Thanks Manuel!
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
We all need a laugh, especially in these crazy times 😊
@MrVasile
@MrVasile 4 жыл бұрын
I SO busted out laughing at that!
@mattvoce1091
@mattvoce1091 4 жыл бұрын
If not using mains earth to chassis be better to use both poles of main switch and switch the active(hot) and neutral, add some heat shrink then you have safer setup!
@jamesmdeluca
@jamesmdeluca 3 жыл бұрын
Greetings: I think your audio signal generator has a sweep function. I have seen it used sparingly, here & maybe another youtube chan. If your gen has presets, please set one for a 20Hz-20kHz sweep and set the scope such that the display completes before it is retrggeredy (if the scope has presets all the better). I presume the gen has a trigger output. This way, at a glance you can display the full bandwidth. I presume you can set other presets to restore your usual settings (if USB computer control is available, that maybe very useful to switch back and forth). I know first time setup is involved, but I am sure you will enjoy the result.
@electronicsoldandnew
@electronicsoldandnew 3 жыл бұрын
I’ve tried that 😊 I’m actually working on another way to get an actual bode plot (other than the built-in bode plot function). It’s pretty simple, so stay tuned 😊
4 жыл бұрын
Hi Manuel. Can you please tell me (us) more about your Dual AC supply? Is that one transformer with taps? How much VA? Any link? And did you put fuses in it or how do you protect it? Thanks.
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
It’s just a simple transformer that has all these taps, which makes it useful. I think it’s about 50VA. I use a 500mA fuse on the primary as a simple protection.
@davidward9935
@davidward9935 2 жыл бұрын
Manuel, thank you again for the wonderfully educational videos. I see you put the potentiometer on the input without any buffer. Will it have an affect on the input device? Should you put a low preamp op-amp before the potentiometer to keep from loading the device under test? Thank you for making me think about the things I studied 40 years ago in high school radio and tv repair classes when tubes were still king but the transition was full on. Best regards, David ka4mep
@electronicsoldandnew
@electronicsoldandnew 2 жыл бұрын
The input impedance that the device under test will see is the pot, and in fact, if you test a circuit, that circuit should do an impedance. In fact, sometimes it needs to see one to work properly. The input impedance is also quite high here, which is also a good thing. Adding an opamp buffer would make this an unrealistic load.
@chrisvinicombe9947
@chrisvinicombe9947 4 жыл бұрын
Very nice build. Mad bandwidth. Will we be getting a "my new scope" video?
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
probably 😊I’ll use it for a while and then comment on it.
@sklgy
@sklgy 3 жыл бұрын
Is this amp also usable to with a set of old stereo speakers? I am looking for a small amp that I can use in my eurorack as multipurpose audio rack.
@electronicsoldandnew
@electronicsoldandnew 3 жыл бұрын
That’s exactly what I use them with. I don’t use good speakers in the workshop in case I damage them in testing equipment.
@sklgy
@sklgy 3 жыл бұрын
@@electronicsoldandnew Perfect, then thank you for guiding me to this module. It is exactly what I was looking for then! Also do you maybe have any tips on powering it with my eurorack uZeus module? It has +5 +12 and -12 and 16 pin headers to connect to.
@Steven_Bennett_YT
@Steven_Bennett_YT 4 жыл бұрын
Great project with amazing results, please may we have purchase links for the pot, knob and binding posts - thanks
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
I’m afraid I had those lying around. I must have bought the posts on ebay. Can’t remember where I got the pot and knob.
@jamesmdeluca
@jamesmdeluca 3 жыл бұрын
Greetings: I was interested in finding your chassis, but think you built it yourself. Probably built the same way as all of your other chassis. Beautiful work BTW.
@electronicsoldandnew
@electronicsoldandnew 3 жыл бұрын
Yes, the chassis is really DIY using a square 65mm aluminium element, with the top cut off.
@Michlag
@Michlag 4 жыл бұрын
For the bandwidth experiment, couldn'T you do a sweep between 10/100kHz? Would that work to get a curve plotted on the scope?
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
No, I’d meet the Bode Plot function which I haven’t figured out how to use yet 😊
@hestheMaster
@hestheMaster 4 жыл бұрын
Bloody amazing indeed Manuel ! I'm sure you will be using it very often.😎 I see your "disliker" has shown up!
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
You’re right! Thought i’d lost him. I was quite worried 😟
@jake359nl
@jake359nl 4 жыл бұрын
Nice project...and well done! Could you please make a video of how you designed that frontplate in Illustrator? I can't find those symbols in any library.
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
I did not use pre-made symbols. Everything is designed simply using the line and polygon tools. There are simpler software packages for this, but I use illustrator as the measurement function is very accurate.
@alfredneumann4692
@alfredneumann4692 4 жыл бұрын
If you adjust the output impedance, you have a ultralongwave transmitter. :-)
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
True. I’ll connect an antenna instead of a speaker cable 😊
@geirendre
@geirendre 4 жыл бұрын
Nice kit and really cheap also. See they have a lot of kits including Bluetooth receiver modules...
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
Yes they do. I have bought some stuff from them in the past, with good results.
@Michlag
@Michlag 4 жыл бұрын
Hi Manuel, question: has the frontplate stickers applied? I mean, adobe illustrator ---> print on sticker (how? Got it done somewhere?) ---> apply the stiker? Regards, Mike
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
Illustrator, printed on overhead transparency sheet, stuck with transparent spray glue.
@pneumatic00
@pneumatic00 3 жыл бұрын
I just use a pair of old computer speakers. Doesn't put out 65 watts. Isn't flat from 10 Hz to 100Khz, doesn't protect its speaker. However, it costs $2 at a garage sale and if you blow it up you go get another pair.
@electronicsoldandnew
@electronicsoldandnew 3 жыл бұрын
👍
@sincerelyyours7538
@sincerelyyours7538 4 жыл бұрын
Nice amp! I'll add it to my wish list. Was wondering when you'd trade up your old Rigol DS1052 scope. Looks like you got a nice one!
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
the rigol earned a break 😊
@flemmingchristiansen2462
@flemmingchristiansen2462 4 жыл бұрын
Nice one. Did you leave the board hanging by the chips? I believe that fine amplifier deserves better, as a lab. amp. you don't want to risk those solder joints to fail over time. Just a thought.
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
No, standoffs are being made to support it. The chips get quite warm, so cold solder joints are a real worry.
@flemmingchristiansen2462
@flemmingchristiansen2462 4 жыл бұрын
@@electronicsoldandnew I Know -belt and suspenders but it is sitting in a working environment, bumping the box when plug it in and out, vibrations on the shelf on top when you work at the instruments. The are some heavy components on the board, might react hard on small vibrations.
@sarunasliutkevicius5261
@sarunasliutkevicius5261 3 жыл бұрын
Hi, where is best website to order parts from for amplifier?
@electronicsoldandnew
@electronicsoldandnew 3 жыл бұрын
Mouser, RS components, Banzaimusic, ... really depends where you live.
@sarunasliutkevicius5261
@sarunasliutkevicius5261 3 жыл бұрын
I live in Scotland mate. Thank you so much
@electronicsoldandnew
@electronicsoldandnew 3 жыл бұрын
I’d try RS components in that case. They are very fast.
@sarunasliutkevicius5261
@sarunasliutkevicius5261 3 жыл бұрын
Thank you very much
@Michlag
@Michlag 4 жыл бұрын
Hey, new scope?
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
Yes, Christmas came early 😊
@Michlag
@Michlag 4 жыл бұрын
@@electronicsoldandnew congrats!
@sean-ci3tv
@sean-ci3tv 4 жыл бұрын
make a virtual earth in case mains switch fails to chassis?
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
I’m going to have to change the rail system I use so that the various units don’t connect to each other. Then I’ll earth the chassis without any problem.
@rossthompson1635
@rossthompson1635 4 жыл бұрын
@@electronicsoldandnew You are gathering a fabulous collection of accessories under your shelf there. Will there be an end-piece on the amp section to prevent contact with the mains switch?
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
i definitely need to insulate it. maybe an end piece or hot glue (?).
@rossthompson1635
@rossthompson1635 4 жыл бұрын
@@electronicsoldandnew I know it is under your control in the workshop but I'd be inclined to go for enclosing it rather than glue - just never know what might make its way in there. You could perhaps get one of those boots that goes over chassis mount IEC plugs cpc.farnell.com/bulgin/14064/insulation-boot-20a/dp/CN08377?mckv=s1Exx1fLn_dm|pcrid|224645161149|kword||match||plid||slid||product|CN08377|pgrid|45968746254|ptaid|pla-925788073354|&CMP=KNC-GUK-CPC-SHOPPING&gclid=Cj0KCQiA48j9BRC-ARIsAMQu3WSEo_YngRfHXWfHZpSy7ainmVC1D_YRkLgbz7irDE4Xk_nj_R1sSxMaAvbxEALw_wcB
@SheikhN-bible-syndrome
@SheikhN-bible-syndrome Жыл бұрын
That's a ic amp not a chip amp a chip amp would be something like the ne5532
@BjornV78
@BjornV78 4 жыл бұрын
You can't have to many amplifiers ;-)
@electronicsoldandnew
@electronicsoldandnew 4 жыл бұрын
👌
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