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

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  • Опубликовано: 22 дек 2024

Комментарии • 74

  • @electronicsoldandnew
    @electronicsoldandnew  4 года назад +8

    Where’s my “Dislike” fan? Can’t believe I may have lost him. I sure hope not. 😊

  • @SheikhN-bible-syndrome
    @SheikhN-bible-syndrome Год назад

    That frequently response is incredible I've never seen a amp do that good over that wide of an audio band

  • @mackfisher4487
    @mackfisher4487 4 года назад

    Excellent job Manuel, I really like your rail method of hanging your homebrew test equipment accessories well thought out.

  • @waynethompson8416
    @waynethompson8416 4 года назад

    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 года назад

      i’m actually quite shocked myself. I keep wondering if I was seeing right.

    • @paulpaulzadeh6172
      @paulpaulzadeh6172 4 года назад

      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 года назад

      I’m a defender of the KISS philosophy 😊
      Way too complex for my needs.

  • @__Dude_
    @__Dude_ 4 года назад

    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!! 😊 😊 😊

  • @OliverWoodphotography
    @OliverWoodphotography 4 года назад

    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 года назад

      I also used the LM3875 for quite some time without issues. This one is amazing as a test amp.

  • @petercornell2002
    @petercornell2002 4 года назад

    Great vid, thanks. Excellent specs on the amp! Peter

  • @Steven_Bennett_YT
    @Steven_Bennett_YT 4 года назад

    Great project with amazing results, please may we have purchase links for the pot, knob and binding posts - thanks

    • @electronicsoldandnew
      @electronicsoldandnew  4 года назад

      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.

  • @mattvoce1091
    @mattvoce1091 4 года назад +1

    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!

  • @davidward9935
    @davidward9935 2 года назад

    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 года назад

      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.

  • @jake359nl
    @jake359nl 4 года назад

    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 года назад +1

      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.

  • @danielsaturnino5715
    @danielsaturnino5715 4 года назад

    One more tool in the shelf :) and a good one it seems.

  • @Michlag
    @Michlag 4 года назад

    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 года назад

      No, I’d meet the Bode Plot function which I haven’t figured out how to use yet 😊

  • @Michlag
    @Michlag 4 года назад

    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 года назад

      Illustrator, printed on overhead transparency sheet, stuck with transparent spray glue.

  • @DerekHerbst747
    @DerekHerbst747 4 года назад

    Your lab is taking shape rather nicely. It probably consumes one quarter of the power mine does. Almost everything I have is tube technology 🙂

  • @sklgy
    @sklgy 3 года назад

    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 года назад +1

      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 года назад

      @@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.

  • @flemmingchristiansen2462
    @flemmingchristiansen2462 4 года назад

    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 года назад +1

      No, standoffs are being made to support it. The chips get quite warm, so cold solder joints are a real worry.

    • @flemmingchristiansen2462
      @flemmingchristiansen2462 4 года назад +1

      @@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.

  •  4 года назад

    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 года назад

      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.

  • @xyredmax
    @xyredmax 2 года назад

    Wow, have you seen how much these are now!

    • @electronicsoldandnew
      @electronicsoldandnew  2 года назад

      I’m afraid not. Hope I didn’t contribute to a price rise 😊

  • @electrosoundaust
    @electrosoundaust 2 года назад

    One word - wow.
    I hope they ship to Australia!

    • @electronicsoldandnew
      @electronicsoldandnew  2 года назад

      I think they do. This thing has been in use for some time now, and has not let me down.

  • @jamesmdeluca
    @jamesmdeluca 4 года назад

    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  4 года назад

      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 😊

  • @chrisvinicombe9947
    @chrisvinicombe9947 4 года назад

    Very nice build. Mad bandwidth.
    Will we be getting a "my new scope" video?

    • @electronicsoldandnew
      @electronicsoldandnew  4 года назад +1

      probably 😊I’ll use it for a while and then comment on it.

  • @sincerelyyours7538
    @sincerelyyours7538 4 года назад

    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!

  • @preiter20
    @preiter20 4 года назад +2

    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 года назад +1

      We all need a laugh, especially in these crazy times 😊

    • @MrVasile
      @MrVasile 4 года назад +1

      I SO busted out laughing at that!

  • @jamesmdeluca
    @jamesmdeluca 4 года назад

    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  4 года назад

      Yes, the chassis is really DIY using a square 65mm aluminium element, with the top cut off.

  • @alfredneumann4692
    @alfredneumann4692 4 года назад

    If you adjust the output impedance, you have a ultralongwave transmitter. :-)

  • @Michlag
    @Michlag 4 года назад

    Hey, new scope?

  • @sean-ci3tv
    @sean-ci3tv 4 года назад

    make a virtual earth in case mains switch fails to chassis?

    • @electronicsoldandnew
      @electronicsoldandnew  4 года назад +1

      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 года назад

      @@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 года назад

      i definitely need to insulate it. maybe an end piece or hot glue (?).

    • @rossthompson1635
      @rossthompson1635 4 года назад +1

      @@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

  • @pneumatic00
    @pneumatic00 4 года назад

    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.

  • @hestheMaster
    @hestheMaster 4 года назад

    Bloody amazing indeed Manuel ! I'm sure you will be using it very often.😎 I see your "disliker" has shown up!

    • @electronicsoldandnew
      @electronicsoldandnew  4 года назад

      You’re right! Thought i’d lost him. I was quite worried 😟

  • @geirendre
    @geirendre 4 года назад

    Nice kit and really cheap also.
    See they have a lot of kits including Bluetooth receiver modules...

    • @electronicsoldandnew
      @electronicsoldandnew  4 года назад

      Yes they do. I have bought some stuff from them in the past, with good results.

  • @SheikhN-bible-syndrome
    @SheikhN-bible-syndrome Год назад

    That's a ic amp not a chip amp a chip amp would be something like the ne5532

  • @BjornV78
    @BjornV78 4 года назад

    You can't have to many amplifiers ;-)