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Old 22nd January 2021, 03:58 PM   #1
knauf1919 is offline knauf1919  Europe
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Exclamation Headphone Amp Photo Gallery

I think it's time to have such a topic here as well.
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Old 22nd January 2021, 04:16 PM   #2
adason is offline adason  United States
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where is yours?
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Old 22nd January 2021, 04:22 PM   #3
knauf1919 is offline knauf1919  Europe
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All my projects are in this state. Here's a mini-zen ...
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Old 22nd January 2021, 05:36 PM   #4
Morde is offline Morde  Finland
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Headphone Amp Photo Gallery
I’m lazy to add pics here again, but you can check my signature for links.
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Head amps: SE84, Salas DCG3, UTHAiM, PassDIY HPA, Pioneer Super Linear, XEN JLH
Power amps: M2x, UDNeSS, F7 clone, F5X
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Old 22nd January 2021, 05:51 PM   #5
adason is offline adason  United States
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the same on my blog, but I have already added few more since then
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Old 22nd January 2021, 05:54 PM   #6
kn0ppers is offline kn0ppers  Germany
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To help kickstart the thread, here is my little headamp that is still waiting for the 3D printed case I wanted to make months ago.

Definitely lot's of things to improve when I look at it now, but overall it works flawlessly (and has been for a year almost). Considering it was one of my first projects, I am pretty satisfied. It's a dual OpAmp in non-inverting configuration, followed by OPA1622 configured as a buffer and everything is powered by LM27762. The switch controls OPA1622's enable pin and everything is mounted on a 4-Layer board. Yes, the coupling caps are too big for the footprint (which was meant to also accomodate SMD film caps). Yes, voltage swing is limited because of USB specifications, voltage drop in the LDOs and the input protection Schottky. And yes, due to the buffer configuration of OPA1622 the capacitive load drive with acceptable phase margin is also limited to around 500pF. I still like it
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Old 22nd January 2021, 10:56 PM   #7
PRR is offline PRR  United States
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Headphone Amp Photo Gallery
I'm going to regret posting:

19 years ago I had a career in portable concert recording. I did not always have a "booth" so I used headphones for quality checking. The onboard phone output on recorders is usually very lame around live performances. I built a 400mW class-A phone amp to fit in the gig-bag. Just for me, not dressed to impress. Worked great. But ran HOT!! So it named itself. I had calculated, but numbers are not the same as laying your hand on it between movements.
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Old 23rd January 2021, 07:26 AM   #8
proid is offline proid
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Quote:
Originally Posted by kn0ppers View Post
To help kickstart the thread, here is my little headamp that is still waiting for the 3D printed case I wanted to make months ago.

Definitely lot's of things to improve when I look at it now, but overall it works flawlessly (and has been for a year almost). Considering it was one of my first projects, I am pretty satisfied. It's a dual OpAmp in non-inverting configuration, followed by OPA1622 configured as a buffer and everything is powered by LM27762. The switch controls OPA1622's enable pin and everything is mounted on a 4-Layer board. Yes, the coupling caps are too big for the footprint (which was meant to also accomodate SMD film caps). Yes, voltage swing is limited because of USB specifications, voltage drop in the LDOs and the input protection Schottky. And yes, due to the buffer configuration of OPA1622 the capacitive load drive with acceptable phase margin is also limited to around 500pF. I still like it
Look really nice!
Do you have problem with the lm27762? I design a power supply for headphone amp around the lm27762 too, the first time, negative side doesn't start up well, it stuck at -2V, i need to use a long usb cable or put 1R resistor to the input 5V to make it work. But after that, when load current is increase ( power 1 opamp opa1688 at 1Vrms at 32R, mean about 70ma load current) the power supply buzzing very loud, it's kind of 17,18khz frequency. At smaller load, it still buzz but it's quieter.
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Old 23rd January 2021, 08:56 AM   #9
knauf1919 is offline knauf1919  Europe
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This topic can be a real source of inspiration for those who want to make a headphone amplifier.
I think it's worth putting at the top of the list.
Thanks.
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Old 23rd January 2021, 09:19 AM   #10
osscar is offline osscar  Latvia
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Four "creatures" I've soldered so far:

1st - Marsh headphone amp with integrated B1 buffer
2nd - Marsh with a small box on top- Class A single Mosfet "buffer" HPA
3rd and 4th the famous WHAMMY
5th - temporarily without enclosure - High speed HPA from Bruno Carlsson
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File Type: jpg DSC00480.jpg (156.2 KB, 426 views)
File Type: jpg DSC01070.jpg (120.4 KB, 348 views)
File Type: jpg DSC00522(1).jpg (522.9 KB, 342 views)
File Type: jpg DSC00509(1).jpg (349.9 KB, 335 views)
File Type: jpg DSC00972.jpg (695.3 KB, 299 views)
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My DIY so far: two Leach amps,two Pass AB100, Pass F5, B1 buffer, Hiraga le monstre, two LM3875, LM1875, OPA549, 6C33C SE, GU32 PP, 6p3c-e PP, Marsh headphone amp.Phono - OBH-8se, Pacific RIAA, inDiscreet Phono, MF A1 Clone, Whammy headphone amp, high-speed HPA, jlh1969
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