PA4MW
PA4MW
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Fixing up grannies tube radio, the Philips B4X82a
Sometimes it is amazing how well designed 'old' technology can be. And how much fun it is to fix it up. This little Philips is an example.
มุมมอง: 320

วีดีโอ

NAP-140 Extended Quarantine Clone
มุมมอง 1.1K2 ปีที่แล้ว
Naim audio is one of the coolest amplifier manufacturers around. As a test project I evaluated PCBs that were offered on eBay and have a strong resemblance with the original. It is quite stunning how this little amp performs. Less power and punch than the NAP-200, but still more than enough to make the neighbors mad ;-).
DIY LM3886 gainclone with MH-M28 BT-module
มุมมอง 3.3K3 ปีที่แล้ว
The MH-M28 is a low-power Bluetooth design solution that supports the latest Bluetooth 4.2 transmission, 2-channel stereo lossless playback. After the module is connected to Bluetooth, it can quickly realize Bluetooth wireless transmission, which is very convenient. In an open environment, the Bluetooth connection distance can reach 20 meters. However to prevent hum (because of ground loop issu...
DIY LM1875 gainclone with MH-M28 BT-module
มุมมอง 1.6K3 ปีที่แล้ว
The MH-M28 is a low-power Bluetooth design solution that supports the latest Bluetooth 4.2 transmission, 2-channel stereo lossless playback. After the module is connected to Bluetooth, it can quickly realize Bluetooth wireless transmission, which is very convenient. In an open environment, the Bluetooth connection distance can reach 20 meters. However to prevent hum (because of ground loop issu...
Kenwood TS-180s PLL unlock issue fixed
มุมมอง 2.1K3 ปีที่แล้ว
The TS-180s is a fantastic communication transceiver and among the first full solid state ones made by Kenwood/TRIO. Unfortunately with age also come problems. One of these problems are PLL-related (showing dots onto the LCD). This problem could be due to dry solder joints, capacitors that have become low in capacitance, but could be also caused by transistors that suffered from oxidation. The ...
NAP 200 Quarantine Clone Amplifier
มุมมอง 6K3 ปีที่แล้ว
Somewhere in 2015 I went to an audio fair and was lucky to listen to an NAP 200 from NAIM. What a sound! Designed by Naim Audio founder Julian Vereker in 1971, the NAP 200 has established for NAIM quite an legacy. Its design is simple and uncompromising. Tip: many sellers mention the MPSA18 as (matched) current source transistors. These have IMHO far too much gain/HFE/beta, causing instability,...
VU -meter circuit explanation of DIY LM3886 (gainclone) Power Amplifier No. 3
มุมมอง 4.2K4 ปีที่แล้ว
This little LM3886 amplifier produces about 2x 48.2 W @ 8 ohms. The VU meters originate from a Sony TC-K51 cassette deck. On request I elucidate a bit more about the VU-meter drive circuit during the video. *Audio volume is a bit low, sorry •ᴗ•
TDA7492 Class D (eBay) kit amplifier
มุมมอง 1.4K6 ปีที่แล้ว
The TDA7492 is a dual BTL class-D audio amplifier with single power supply designed for LCD TVs and monitors. Thanks to the high efficiency and exposed-pad-up (EPU) package, only a simple heatsink is required.
DIY A1 Headphone Amplifier
มุมมอง 7K7 ปีที่แล้ว
This headphone amplifier is based on the A1 headphone amplifier. PCB's were obtained from Jims Audio. Michael van den Born - 2017 Pictures of this and other projects can be seen here: www.flickr.com/photos/66955762@N00/
Honda CB500 (1999, PC32) brief walkaround
มุมมอง 1.4K7 ปีที่แล้ว
I just obtained a CB500. This one in particular was build in 1999. The CB500 is a great motorcycle for beginners, forgiving but still quite fast. Honda CB500 twins were a family of medium-sized standard motorcycles produced by Honda from 1993 until 2003. Because of their low cost, reliability, and good handling they are still quite popular. According to Honda engineers, the engine was designed ...
DIY TDA7294 (gainclone) PA with VU-meters
มุมมอง 2.7K7 ปีที่แล้ว
Unfortunately YT removed all audio of a previous video. Reposted the introduction again with new audio (yep the VU's are out of sync ;-)). This amplifier is based onto a Zero Zone PCB and the TDA7294 IC. It produces about 2x 48W @ 8 ohms with 2x 21VAC rails. Although it can produce more power with increasing voltage, the voltage has been kept deliberately lower so a more compact cabinet that st...
Denon POA-1003 and PRA-1003 repaired and restored
มุมมอง 4K7 ปีที่แล้ว
*Music removed by Google Let me take you to 1976. Jimmy carter became president of the USA, the first VHS video recorder was introduced by JVC and the best selling car in Europe was the Simca 1307. Back in the day most audio equipment was build like a Sherman tank. As is definitely the case with this beast from Denon. An absolute blast from the past if you ask me. It is an Denon POA-1003 in com...
AudioAnalyse A9 class A amplifier repaired and restored
มุมมอง 10K7 ปีที่แล้ว
This amplifier is one of the most remarkable ones I have ever seen. It is fully biased into class A and produces about 60W into 8 ohms. Unfortunately Audioanalyse went bankrupt many years ago, but there are still a few A9's around. It's bigger brother, the A90, has been displayed in the NY Museum of Modern Art. In the A90 Audioanalyse has doubled the output stage and the amount of cooling capac...
DIY adjustable lab power supply
มุมมอง 1.8K8 ปีที่แล้ว
In this video I elucidate briefly an adjustable DC lab power supply (0-28 VDC / 2.5 A) that I have build recently. PCB from circuitsonline.nl Michael van den Born - 2016
DIY LM4780 (gainclone) Power Amplifier (PA03)
มุมมอง 4.7K8 ปีที่แล้ว
This amplifier is based onto the PA03 PCB (Pavel Dudek) and the LM4780 IC. The PCB is quite well thought out which results in a very stable amplifier. It produces about 2x 45 W @ 8 ohms. The VU meters originate from a Sony TC-K1A cassette deck, the driver circuit is my own design. Michael van den Born - 2016 Pictures of this and other projects can be seen here: www.flickr.com/photos/66955762@N0...
DIY LM3886 (gainclone) Power Amplifier No. 2
มุมมอง 41K8 ปีที่แล้ว
DIY LM3886 (gainclone) Power Amplifier No. 2
DIY LM1875 (gainclone) Power Amplifier No. 3.
มุมมอง 5K8 ปีที่แล้ว
DIY LM1875 (gainclone) Power Amplifier No. 3.
TDA2003 photo frame amplifier (mono)
มุมมอง 1.1K8 ปีที่แล้ว
TDA2003 photo frame amplifier (mono)
DIY LM1875 (gainclone) Power Amplifier No. 2
มุมมอง 19K8 ปีที่แล้ว
DIY LM1875 (gainclone) Power Amplifier No. 2
DIY QRV02 Headphone Amplifier with VU-meters
มุมมอง 1.8K8 ปีที่แล้ว
DIY QRV02 Headphone Amplifier with VU-meters
DIY LM1875 (gainclone) Power Amplifier
มุมมอง 9K8 ปีที่แล้ว
DIY LM1875 (gainclone) Power Amplifier
Philips B7X14a REVERBEO tube radio
มุมมอง 2.8K8 ปีที่แล้ว
Philips B7X14a REVERBEO tube radio
DIY LM3886 (gainclone) amplifier fade-in LEDs at power on
มุมมอง 13K8 ปีที่แล้ว
DIY LM3886 (gainclone) amplifier fade-in LEDs at power on

ความคิดเห็น

  • @Navid-UX
    @Navid-UX 10 วันที่ผ่านมา

    Can you please tell the output transistors values or any substitute? Thank you

  • @inayathatp
    @inayathatp 3 หลายเดือนก่อน

    sbc or aac codec ?

  • @inayathatp
    @inayathatp 3 หลายเดือนก่อน

    sbc or aac codec ?

  • @Nikolay-pz5jr
    @Nikolay-pz5jr 8 หลายเดือนก่อน

    Очень красивая сборка!! Молодец 🇷🇺🇷🇺😀

  • @ruudvanleeuwen7320
    @ruudvanleeuwen7320 9 หลายเดือนก่อน

    Hey Michael, ik kom soms terug op deze video. Blijft leuk. Mijn A9 speelt nog steeds en ben er erg blij mee. Ik denk er aan om een tweede aan te schaffen en dan te bridgen. Zou dat werken denk je?

  • @vizion68
    @vizion68 9 หลายเดือนก่อน

    hey, it sounds good !

  • @Unker_Spunkanathan
    @Unker_Spunkanathan 11 หลายเดือนก่อน

    No new projects?

  • @w00lf77
    @w00lf77 ปีที่แล้ว

    Hi, where can I get such a nice chassis like yours ?

  • @BertKrus
    @BertKrus ปีที่แล้ว

    Amazing and beautiful 😍

  • @fix-diy941
    @fix-diy941 ปีที่แล้ว

    สวยงามๆๆๆๆๆๆๆๆๆๆๆๆๆๆๆๆๆๆๆๆๆๆๆๆๆๆๆๆมากครับ

  • @hadikayanuar1367
    @hadikayanuar1367 ปีที่แล้ว

    Where you bought PCB for Binding post

  • @Audiopulse9
    @Audiopulse9 ปีที่แล้ว

    Scamatic please

  • @porouri
    @porouri ปีที่แล้ว

    잘 만드셨네요.

  • @iviv1940
    @iviv1940 ปีที่แล้ว

    Is SANKEN 2SC2922 good analog of original nap 200 transistors ?

  • @manmeetjammu
    @manmeetjammu ปีที่แล้ว

    Sir, How do you make these aluminium enclosure ? Are they pre made or custom ?

  • @riviirich
    @riviirich 2 ปีที่แล้ว

    How do you set up the bias? Coul you please explain it in details?

  • @akosgyorfi
    @akosgyorfi 2 ปีที่แล้ว

    Great work Could you please link here the source of the toroid transformer? Many thanks

  • @wolidhassanbadol4045
    @wolidhassanbadol4045 2 ปีที่แล้ว

    AC 27 0 27 sony trnsformer................run.............yes or no

  • @theOneUser
    @theOneUser 2 ปีที่แล้ว

    Hi, are these the same dimensions as here th-cam.com/video/852AlQWI63M/w-d-xo.html ? Or is the depth 280mm? Thanks P.s. very nice amp!!

  • @pingpongjj
    @pingpongjj 2 ปีที่แล้ว

    I am a little confused about how to connect the power supply and ground. Do I connect the ground of the socket to the ground of the PCB board?

    • @PA4MW
      @PA4MW 2 ปีที่แล้ว

      Hi John, the best option would be to make a so called 'star ground'. This means that all ground connections are bundled and attached to the chassis at one point. This prevents ground loops. In between the two filter caps, one could solder a lead. This lead can be routed to the star ground. The ground connection from the IEC-plug can be routed to this same point. This article is very interesting and explains it in more detail: sound-au.com/earthing.htm

  • @Unker_Spunkanathan
    @Unker_Spunkanathan 2 ปีที่แล้ว

    Very nicely built. I've bought quite a few kit amps since the start of covid. They include the Mx50se, irs2092 based class D, tpa3255 based class D. I thought they sounded very competent and clean, until I recently got a nap140 clone. Initially it sounded very ordinary. However, it kind of grew on me and now, when I use the Mx50se, I realised the presentation is very different and less pleasing. Also, the nap140 seems to sound better without a preamp, just a passive pot to control the volume. I've no prior experience with the naim sound and I have to say that this is very intriguing. Will definitely need more time to compare with the rest of my amps

  • @MrPriyoDas
    @MrPriyoDas 3 ปีที่แล้ว

    Excellent build. I enjoy your videos.

  • @NikiDorian
    @NikiDorian 3 ปีที่แล้ว

    Hello! Thank you for the schematic! May I ask, how do you cut the face plate? And also, what are the dimensions of the case you are using?

  • @MrSouzy
    @MrSouzy 3 ปีที่แล้ว

    thanks for the video. I actually have one of these too. But I bought mine premade with no name. It actually sounds pretty good with a very detailed presentation. But it isnt really much better than my NAD. Just different. I took a look inside and at least to the untrained eye it looks very similar to the real thing. A least the layout is exactly the same. It was of course as you say a bit of a gamble and I have no idea whether the sanken transistors are genuine. The circuit is very simple though which makes me think why the real thing is so expensive. Just as a side note it seems to sound better once it has been switched for a while. It runs amazingly cool..

  • @chokchai2513
    @chokchai2513 3 ปีที่แล้ว

    Nice VU Meter

  • @Unker_Spunkanathan
    @Unker_Spunkanathan 3 ปีที่แล้ว

    I wish I have the patience to build such a beautiful amp. Where did you get the volume from? Looks great! Did you document your construction of your amps somewhere. Want to learn more

  • @maxchau8558
    @maxchau8558 3 ปีที่แล้ว

    May I ask how do you connect Bluetooth to the amp board? Thank you

  • @igorAaudio
    @igorAaudio 3 ปีที่แล้ว

    How is amplifier sound?

    • @MrSouzy
      @MrSouzy 3 ปีที่แล้ว

      Hi James I can tell you how my prebuilt version sounds. It has the same circuit board as in this video. The overall presentation is what I would call transparent, detailed and clear. There seems to be a little extra energy at around 2khz which enforces that detailed sound. Mine isnt a warm sounding amp and I could say it is a little forward but it isnt really harsh either.

  • @igorAaudio
    @igorAaudio 3 ปีที่แล้ว

    Can you give link of amp diy in eBay ?

  • @CoquiAudio
    @CoquiAudio 3 ปีที่แล้ว

    Where did you get the square green LED? like really nice

    • @PA4MW
      @PA4MW 3 ปีที่แล้ว

      Thanks! I found them on a local ham radio flee market a few years ago. Unfortunately I do not have a part number. But I do think that on AE and eBay similar items could be found.

  • @giir3211
    @giir3211 3 ปีที่แล้ว

    Hello, nice job! What did you use to clean the aluminum face plate?

    • @PA4MW
      @PA4MW 3 ปีที่แล้ว

      Thanks! First I clean thoroughly with a degreasing agent and water (St. Marc works really well!), next I polish the plate with silver polish (for example Brasso). A last clean with water completes the job :-)

  • @MrPriyoDas
    @MrPriyoDas 3 ปีที่แล้ว

    Nice build. How does the MH-M28 BT-module performs in such a high quality gainclone amp?

    • @PA4MW
      @PA4MW 3 ปีที่แล้ว

      Thanks Priyo! Better than I expected. But in all honesty I have to say that the internal DAC of the BT-module is not superb. The best results are therefore achieved by connecting directly via the RCA's through a good DAC. The difference is clearly audible as the amplifier exceeds the BT-module in sonic capabilities. But... despite the BT-module has some shortcomings, I have to say that, considering it only costs a few dollars, the BT-module is quite an achievement that is real value for money ;-) Definitely a nice and cheap addition/feature to implement into a DIY gainclone!

    • @MrPriyoDas
      @MrPriyoDas 3 ปีที่แล้ว

      @@PA4MW Well the BT surely add some convenience by sacrificing some audio quality. I liked the enclosure. It is pretty neat !

  • @tremor8197
    @tremor8197 3 ปีที่แล้ว

    Nice work it looks great

  • @srdjant0
    @srdjant0 3 ปีที่แล้ว

    Love this design. Really lovely. I'm building a stereo LM3886 and I think there's no way mine could be as clean and wonderful, but you give me inspiration for my own project. Thank you!

  • @BogdanWeiss
    @BogdanWeiss 3 ปีที่แล้ว

    Very nice layout & implementation..... Where did you purchase the enclosure ?

    • @PA4MW
      @PA4MW 3 ปีที่แล้ว

      Thanks Bogdan! I bought it via AE, I am not allowed to put a link, but you can find it via BRZHIFI BZ2205R :-)

    • @BogdanWeiss
      @BogdanWeiss 3 ปีที่แล้ว

      @@PA4MW Thanks.... The cost of shipping is 3x the purchase cost :( if you are thinking about a more refined & resolving amplifier, I can confirm that Rod Elliots 200W mosfet may well be the last amplifier to build sound-au.com/project101.htm

  • @jangroen9252
    @jangroen9252 3 ปีที่แล้ว

    goed bezig als amateur ..zo moeten we er meer hebben ..

  • @gman7692
    @gman7692 3 ปีที่แล้ว

    The original 70s NAP200 is far removed from the NAP200 you heard at the audio fair. The original version is so rare! The newer iteration of the NAP200 was introduced in 2002. Kudos for building your own version, but unfortunately you have overlooked many of the details that make the Naim amp what it is. The solid PCB supports, the relay, the screw terminals, soft start circuit - all these little things add up & will affect the sound. Also - I'm not sure what country you are in, but did you ensure the casework is grounded? In any case, if you're happy with it, that's all that matters - as long as it's not going to kill you!

  • @marinusholland
    @marinusholland 3 ปีที่แล้ว

    Mooi en ze worden weer gemaakt!

  • @tremor8197
    @tremor8197 3 ปีที่แล้ว

    Its assembled board or u made it

    • @PA4MW
      @PA4MW 3 ปีที่แล้ว

      The board was unpopulated when I bought it. I find it a bit tricky to buy a populated version as the transistors could be counterfeit. And soldering is fun 😉

  • @ChaloZelaya
    @ChaloZelaya 3 ปีที่แล้ว

    What is that board you put on the output speaker?

    • @PA4MW
      @PA4MW 3 ปีที่แล้ว

      That is a speaker protection board which senses DC and adds a smal delay at startup. I added it mainly for protection, but the original NAP-200 also causes a small ‘pop’ towards the speakers when the amp is powered on (or off). It is based on the UPC1237 IC. Works like a charm 😃

    • @ChaloZelaya
      @ChaloZelaya 3 ปีที่แล้ว

      @@PA4MW thanks !! Nice builds by the way

  • @TheManeliss
    @TheManeliss 3 ปีที่แล้ว

    Hi! Do know the difference between A1 and A2? On chinese version like yours. I've found many versions on Ali... Thanks!

  • @dennyindarnanto2134
    @dennyindarnanto2134 3 ปีที่แล้ว

    That's very cool man....👍

  • @kasturiGM
    @kasturiGM 3 ปีที่แล้ว

    i am into audio, i would love to build a class A amplifier. i have a question. how is this compete with a $3000 amplifier. what’s the difference? would i able to achieve that for cheap? specifically a 6 watt class A amplifier from Eleven Audio.

    • @PA4MW
      @PA4MW 3 ปีที่แล้ว

      Phew, that is a difficult question to answer. If you ask me price is not always an indicator for quality; some amplifiers are value for money while for others one pays merely for branding and dissapointing quality. It is definetely possible to make high class audio with limited budget. Sure, it asks for creativity and a bit of luck when buying parts, but nothing is impossible :-)

    • @jacopgrahn7286
      @jacopgrahn7286 3 ปีที่แล้ว

      you coud be able to build a amp that could cpmpete with a 3000 dollar amplifier. But you should keep in mind that the more perfomence you want, the more the price to performance ration will increase. I would say that you could build a amplifier that could compete with amplifier that cost 1500 dollar quite cheap. But upwards from there the price to performance ratio will increase quite alot. But if you want to accieved Super high end amplifier, then it exist alot of copies of amplifiers on aliexpress that are a fraction of the original amp cost. But any way, i assume you want to not pay more than 200 dollar. Then the performande per dollar ratio will highly depend on you doing your reseach before buying, and really try to shave down the cost on everything. The beyerdynamic a1 design are absoloutly the best price to performance design to use. I think it exist 4-5 different design base on the A1 design on Aliexpress, all differ abit in performance. The amp in the video are probaly the cheapest one, and all parts used in the video (not counting the cost off the case) are probaly around 40 dollar. 20 dollar for a finished board of the amp, and 20 dollar for the transformer.

  • @davidnewboult6887
    @davidnewboult6887 3 ปีที่แล้ว

    Would have liked to have seen a video sound clip of this amp and also your thoughts on sq

    • @PA4MW
      @PA4MW 3 ปีที่แล้ว

      Thanks David! I am planning of making a video with music soon. However, YT has a tendency to remove videos because of claims concerning author music rights. Did not want to risk that ;)

    • @davidnewboult6887
      @davidnewboult6887 3 ปีที่แล้ว

      @@PA4MW I understand there is a site to go on that you can hear music that is free to play on YT, or at least one You Tuber said on one of his videos: Don't ask me were and what the music is like though Lol

    • @davidnewboult6887
      @davidnewboult6887 3 ปีที่แล้ว

      @@PA4MW I understand there is a site to go on were you can hear music that is free to play on YT: I asked since I had been planning on buying an pre built ICE amp, but there could be a concern over input sensitivity since I wanted to use a passive pre and thought one of these 'Naim' amps could be the solution: There really are too many amps too choose from now: May I ask what the sound quality is like since I did read a feedback comment regarding the quality of the components inside, not the actual build quality, I would be buying pre built, thanks for posting and your reply of course

    • @sylaw16
      @sylaw16 3 ปีที่แล้ว

      @@PA4MW let us know how it sound? compared to the real one

  • @birdmedicaldevices
    @birdmedicaldevices 3 ปีที่แล้ว

    Hello where can I get this VU meters ?

  • @logotrikes
    @logotrikes 3 ปีที่แล้ว

    That's a very competent sound you've got there. Do you have any construction footage? Or from whence the boards came?I see plenty of LM 1875 boards and kits available on Aliex and Ebay. I'm becoming increasing more confident that LM 1875 is the way to go, even though I have plenty of amps already, both SS and tube...

    • @PA4MW
      @PA4MW 3 ปีที่แล้ว

      Thanks Martoon! The PCB I got from eBay, but last time I checked these are not available anymore. I am currently constructing a new version based on another bord. Will make a video soon :-)

  • @S2audioamplifier
    @S2audioamplifier 4 ปีที่แล้ว

    Pcb design where I found this

    • @PA4MW
      @PA4MW 3 ปีที่แล้ว

      Jims Audio (eBay)

  • @adityamody8942
    @adityamody8942 4 ปีที่แล้ว

    Looks and sounds beautiful

  • @inception-hifi
    @inception-hifi 4 ปีที่แล้ว

    Hello Michael! the question: have you compared the sound with and without a VU meter in the sound path? Does its inclusion in the signal path affect the sound?

    • @PA4MW
      @PA4MW 3 ปีที่แล้ว

      Hi Roman, yes I did :-). The VU meter is not influencing the signal path. However, what is very important is that the circuit is DC fed via a separate PSU (or DC/DC-converter with galvanic separation). Otherwise there is a reasonable chance of a ground loop. This could culminate in buzz/hum (of 50/100Hz).

    • @inception-hifi
      @inception-hifi 3 ปีที่แล้ว

      @@PA4MW cool! Thanks for your answer ! Is it relevant also in case I’ll use as mains toroidal transformer with two secondaries and 2 separate rectifiers pcb? I don’t want to put 2 trafos also it takes place inside, but probably 300VA toroidal with 2x24v and 1x12v will solve the issue?

    • @PA4MW
      @PA4MW 3 ปีที่แล้ว

      @@inception-hifi No problem, glad to help 😃 That is perfect indeed; one toroidal transformer with 2x24 and 1x12 would solve the issue. You could also tap from the 2x24, rectify it and put it through a regulator to get a stabilised voltage. However, I would advise to then galvanically separate the 12V (to prevent ground loops). You can do that for example with a B1212S-1W DC-DC module (very cheap on Aliexpress). The 12V is in general very usefull because you could also power the DC protection circuit with it or a Bluetooth module.

    • @inception-hifi
      @inception-hifi 3 ปีที่แล้ว

      @@PA4MW Thank you for the answer and your advise Michael! I think I will implement the Sony TA-212 VU meter schematics because I will use their VU meter for my amp. Also I have all the parts for this schema. And for the backlight I'm going to use 2 LEDs because I already have a dedicated line from rectifier board for the LED. I don't have your e-mail, so I can't send you mentioned schema unfortunately to have your opinion...

  • @inception-hifi
    @inception-hifi 4 ปีที่แล้ว

    OMG! Where did you find this VU meter?! In my childhood in 1979 we had a Sony TA-515 with a same VU meter! I'd like to order the same for my GC but I can't find it...

    • @TheTycarroll
      @TheTycarroll 3 ปีที่แล้ว

      I have the same issue, does anyone know where we could find VU meters like this for sale? Or is the only way to find and old amp and tear it down???