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Headphone amplifier TPA6120 - RS Headamp 2016

wiorekw 9462 15
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  • Headphone amplifier TPA6120 - RS Headamp 2016

    Listening to music on large headphones connected directly to the sound card, I often lacked power in them. I decided to try to construct a fairly simple amplifier based on the Noise Reducer kit - Headamp 2016 on the TPA6120 chip.

    This is my first construction, which I managed to complete fully. It was created for about half a year, including during the waiting time for various parts that traveled from China (housing), and the lack of free time to "push" it forward. I also hunted for small luck, but eventually I ended up buying a new one from Toroidy.pl. The amplifier kit itself is very well described on the RS channel, so I will not write here.
    All holes in the front panel made by hand with a drill, at first glance I decided to make a back panel from dibond (CNC milled) to keep the original aluminum panel in case of failure. Ultimately, I left it in a version that does not bother me, and by the way I can use the aluminum panel for the front, which unfortunately I scratched when drilling the hole for the potentiometer (although this is not very visible).

    Below photos from the creation, unfortunately taken with a phone that only then I had on hand.

    Headphone amplifier TPA6120 - RS Headamp 2016 Headphone amplifier TPA6120 - RS Headamp 2016 Headphone amplifier TPA6120 - RS Headamp 2016 Headphone amplifier TPA6120 - RS Headamp 2016 Headphone amplifier TPA6120 - RS Headamp 2016 Headphone amplifier TPA6120 - RS Headamp 2016 Headphone amplifier TPA6120 - RS Headamp 2016

    Neutral headphone jack, which was easiest to mount on the front panel, Alps blue potentiometer, RCA rhodium sockets, 20W toroidal transformer (smallest available) 2x13V, standard version proved to be sufficient (zero any hum), all-aluminum housing from China. I was thinking about shielded signal wires, but it turned out to be unnecessary. The amplifier has quite a large output power, the difference in quality between the sound card and it is very large. Now only the headphones change for the better.

    Headphone amplifier TPA6120 - RS Headamp 2016 Headphone amplifier TPA6120 - RS Headamp 2016

    Cool! Ranking DIY
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    About Author
    wiorekw
    Level 13  
    Offline 
    wiorekw wrote 192 posts with rating 45, helped 4 times. Live in city Jarocin. Been with us since 2006 year.
  • #2
    Freddy
    Level 43  
    Hmm, ready module inserted into the finished housing ...
    wiorekw wrote:
    The amplifier has quite a large output power ...
    "P = 100mW, RL = 32?".
    Is it such a big output power?
    Where do you get the signal fed to the amplifier's input?
  • #3
    wiorekw
    Level 13  
    TPA6120 provides 500mW at 32?, can work with loads even from 8?. It's probably a lot for a headphone amplifier.
    Signal from a sound card from a laptop, from a DAC to PCM2704 or from a CD H / K HD720 - depending on your needs.
  • #4
    Freddy
    Level 43  
    wiorekw wrote:
    TPA6120 provides 500mW at 32?, can work with loads even from 8?. It's probably a lot for a headphone amplifier.
    Yes, a lot, but at these 500mW distortions are already increasing significantly.
    The nominal power for headphones is 80mW and this is usually sufficient.
    Personally, I use such an amplifier and it is enough for me.
    Quote:
    Signal from a sound card from a laptop, from a DAC to PCM2704 or from a CD H / K HD720 - depending on your needs.
    From the rope exit, you won't improve the quality too much. :) Although the fact that in the sound card the audio amplifier is worse.
  • #5
    kasss12
    Level 4  
    So what if the plate is ready, let the boy do what he loves. Why should he overpay 3x, how can he also learn something. Distortions are growing by leaps and bounds, I doubt that at 0.5W.
  • #6
    Freddy
    Level 43  
    After all, nobody chases him for it, kasss12 do not clutter the subject.
  • #7
    Gismot
    Level 17  
    For me, the power switch on the back of the case is not a very comfortable solution,

    we go further:
    - no fuse protecting the trafo on the 230V network side.
    - unshielded audio cables, and too close to the power supply (RCA socket) - at maximum control you have no problem with the network hum?
  • #8
    wiorekw
    Level 13  
    Strangely, there is no problem with the hum, even with the maximally "unscrewed" potentiometer. I was thinking about using shielded cables before everything went to the housing (I was also worried about the influence of the transformer proximity on the system), but since the problem does not occur, I left it as it is. The switch on the back is a matter of habit, the amplifier is in my position so that I have free access to it. Lack of a fuse is a disadvantage, but in some factory constructions it is also missing. I didn't really have how to push it in, the only thing involved was the power socket with it and the switch.
  • #9
    wojtek9313
    Level 12  
    Will you provide any information on the advertisement with the housing? It can be PW.
  • #10
    katakrowa
    Level 20  
    I also folded it.

    Headphone amplifier TPA6120 - RS Headamp 2016 Headphone amplifier TPA6120 - RS Headamp 2016 Headphone amplifier TPA6120 - RS Headamp 2016 Headphone amplifier TPA6120 - RS Headamp 2016 Headphone amplifier TPA6120 - RS Headamp 2016

    I will say this. Oscilloscope measurements are impressive. The 100Khz signal "rectangle" transfers without stuttering :-) You can see that it is fast. In comparison with the transistors from the topic: https://www.elektroda.pl/rtvforum/topic3326129.html in measurements there is a really big difference.

    As for listening, I use the DAC with PCM2703 and the "M-Audio m-track eight" interface.
    On PCM I didn't hear any gigantic difference in sound between the above mentioned transistor and the RS amplifier, however, when I used "M-Audio m-track eight" as the source, in the highest registers (mainly the drum plates or the "cracking" of the electric guitar) they were definitely sharper on the RS .
    Which sound do I like finally? It's hard to judge. First of all, the difference is so insignificant that we won't be able to hear it without special listening.



    Gismot wrote:
    For me, the power switch on the back of the case is not a very comfortable solution,


    I also have in the back. In order not to pull the 230V cables next to the whole board and signal cables - it's a little hard to do it better in such a small housing ...


    Gismot wrote:

    - unshielded audio cables, and too close to the power supply (RCA socket) - at maximum control you have no problem with the network hum?


    I'm not here either. There is silence almost like when turned off,
  • #11
    djpolb
    Level 16  
    katakrowa wrote:
    I also have in the back.
    me too

    katakrowa wrote:
    I'm not here either. There is silence almost like when turned off,
    Affirmative.

    This is me too :wink:
    Headphone amplifier TPA6120 - RS Headamp 2016 Headphone amplifier TPA6120 - RS Headamp 2016 Headphone amplifier TPA6120 - RS Headamp 2016

    Anticipating the questions - I'm not using this headset. He was hooked up to the test and remained so for now. The earphone holder is a bent 6 mm aluminum rod with threaded shoelace.
  • #12
    KrisNext
    Level 11  
    Hello everyone, I'm also proud of my amplifier on the same system

    My version is double, meaning in one housing there are two amplifiers with independent volume control
    The amplifier has two stereo inputs, one balanced on XLR connectors and the other unbalanced on RCA connectors.
    Each amplifier can individually choose from which input it receives the signal.
    The power supply is outside because 230V packing into such a small housing somehow did not suit me.

    one of the pictures shows the design of the board with the casing so you can compare how the design is to be made

    Regards

    Headphone amplifier TPA6120 - RS Headamp 2016 Headphone amplifier TPA6120 - RS Headamp 2016 Headphone amplifier TPA6120 - RS Headamp 2016 Headphone amplifier TPA6120 - RS Headamp 2016 Headphone amplifier TPA6120 - RS Headamp 2016 Headphone amplifier TPA6120 - RS Headamp 2016
  • #14
    bsw
    Level 16  
    Is there documentation available for this amplifier somewhere on the network (RS 2016) or do I need to buy a kit
    (pig in a poke)?
  • #15
    Rocky Horror
    Level 31  
    The author built such a nice headphone amplifier, and such a design babol has passed ... The ground wire cannot be screwed to the toroid screw. Now, when you touch the amplifier housing (or the equipment connected to it) to any other grounded object, a short circuit will be created through the ground loop.
    People still reproduce this mistake :roll: .