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Needed a bit stable headphone amp for my Sennheiser HD201.
Lots of long audio cables from various sources with varying impedances around in the house..

OK, maybe LM380 (yes old days) or LM386, make a peeseebee, potmeter, connectors, housing
$+$+$+$ plus local shipment > 5 Euro (> 5 USD)...

mm ebay?
Sure!
 https://www.ebay.com/itm/293190924115
  9 $ and free shipping, cannot buy the parts for that (only 1 LM3.. in junkbox).

So it arrived, I build it (values are marked on peeseebee), and it works, even on 9 V!

But all the time I was wondering about the schematic:
 http://panteltje.com/pub/chinese_headphone_amp_schematic_IXIMG_0191.JPG
  mm an opamp output connected to a + input????

Looked up the chip datasheet, sure enough + and - input reversed in the schematic!

 http://panteltje.com/pub/chinese_headphone_amplifier_build_IMG_0193.JPG

So audio-philes, there you are :-)

Had not build a kit in many years, this was fun.


Re: For audophiles
On 10/20/19 2:28 PM, Jan Panteltje wrote:
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yup


Some 1-2.2k resistors pulled down from the op amp outputs to -Vcc would  
keep the 5532s in class A longer at low volumes.

though say 32 ohm headphones seems like a kinda brutal load even for 2  
in parallel. I think their max continual AC is like 10mA? and it's  
asymmetrical

A "real audiophile" would use LM1368s or suchlike serious overkill






Re: For audophiles
On 10/20/19 4:52 PM, bitrex wrote:
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Sorry I mean LT1368


Re: For audophiles
On a sunny day (Sun, 20 Oct 2019 16:54:34 -0400) it happened bitrex

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Interesting chip.

Yes, for my ears I do not drive the Chinese thing at full volume,
so 47 Ohm is OK, the feedback will give a flat range.

Did not hear any distortion, it is less than my piezo tweeters in the high ;-)

I did put a piece of yellow heatshrink over the blue LED..


Re: For audophiles
On 10/21/19 3:12 AM, Jan Panteltje wrote:
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It is but I got the number wrong again! I meant LT1364. That's more like  
it with respect to "audiophile" heh heh

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Re: For audophiles
On a sunny day (Mon, 21 Oct 2019 05:14:56 -0400) it happened bitrex

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So harmonic distortion <= 0.02 % at 20 kHz..

I think there are many chips that qualify to drive a few Ohms headphone.
I measure about 26 Ohm at DC for my Sennheiser....

The OLD LM380 was OK for monitoring, high-fi I am not so sure,
depends on where you extraterrestrial perception is.

Much of that audio is in the imagination.

I remember going with an audio line amplifier to the test lab,
designed it together with my boss, and it got accepted.. for TV broadcast that is.
I was really surprised, expected a big fight, cannot remember what crannies were in it,
And an amplifier for optical cell in a 35 mm projector, that sort optical track audio was not what you
today would call HiFi.

So, I can still hear 10 kHz, not bad at my age ..
2345 audio / music tracks on this laptop..

Yesterday I burned DVD number 999.
Big light proof alu box is now full.
Added an other 3 TB drive in PC number 2.
rarely have time to listen to music these days,
just got a new Raspberry Pi4 and am rewriting the code...
:-)

bbzz that new Pi4 does not even play HEVC video, bummer,
my Chinese 30 $ DVB-T2 box with build in power supply does.
Raspberry.org is moving in the wrong direction I think.
Much stuff does not even install on 'buster'

Video
ID                                       : 7031 (0x1B77)
Menu ID                                  : 730 (0x2DA)
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main@L4.1@Main
Codec ID                                 : 36
Duration                                 : 1 h 45 min
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 50.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0 (Type 0)
no go.

The stones in where was it .. Cuba, interviews South America..

Recoding with ffmpeg to H264 runs at 6.5 frames per second, took all night...
Those guys just keep going.

OK, back on topic :=)







  


Re: For audophiles
bitrex wrote:
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   Audiophools pay big bux for overkill..

Re: For audophiles
On Sun, 20 Oct 2019 18:28:34 +0000, Jan Panteltje wrote:

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Great, all you need now is a pair of 47 Amp headphones to go with it! :-D

Seriously, though - a board from China with its own enclosure! They are  
really come on these days. ;-)



--  
This message may be freely reproduced without limit or charge only via  
the Usenet protocol. Reproduction in whole or part through other  
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Re: For audophiles
Jan Panteltje is Nuts wrote:

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** "bit stable" = wot ?  


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** But very badly.  

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** Not Found Error  

That design is very poor - even with +/-15Vsupplies an NE5532 is not up to the task.  


.....  Phil  




Re: For audophiles
On a sunny day (Sun, 20 Oct 2019 17:48:33 -0700 (PDT)) it happened Kill

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You need a computah for that.


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I guess it all depends on your volume and hearing.
I played some music via it for test and it was good enough for me.
Even could hear test tones much higher than I thought I could
was even looking at weatherfax pictures...
The subtle trebble and deep basses in a transparent 4D acoustic picture
make for an immersing deep connected warm sound experience,
;-)


Re: For audophiles
Jan Panteltje Raving Wog Nutbag wrote:

-------------------------------------


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   ** How mysterious ...  


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   ** Stunned silence ....  



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 ** You need a brain that ain't so faulty.    


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** You guess everything.  

   Then you post BULLSHIT !!  



..... Phil  


Re: For audophiles
On a sunny day (Mon, 21 Oct 2019 01:22:08 -0700 (PDT)) it happened Kill

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Later ...
I remembered I had an downed under I{ that could not access my servers at that time those ran at home
As sysadm I contacted them on behalf of their customer (who complained to me)
and had them check their routing

But as you are such a genius you could do the following in a real Linux computer:

Type
host panteltje.com
that should show:
 panteltje.com has address 37.148.205.129

Then type
traceroute 37.148.205.129
 see where it gets stuck

Then look up the IP where it gets stuck.
(ip_to_country)
Very likely down under, problem you get when everything is upside down and water flows all over y'r hat.


Then contact your ISP's sys administrator, complain, show them the log you just made
and hope they know enough to fix it.

Bit isolated down there I guess without access to EU internet :-)

If you were a bit polite I would do it 4 you, but I leave the chance to you to actually learn something more
than insulting.

killfile
:-)

Re: For audophiles
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er flows all over y'r hat.
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That's the best place to kennel Cretin the insult dog. Him and his  
little buddy further up keep insisting that my own mixer amp  
http://michael2.home.crcomp.net/electronic/mixeramp/index.php suffers  
from distortion. They apparently use their ESP to diagnosis it.
    Anyhow, your jpg shows up just fine for me. My own circuit uses a
TEA2025B. It delivers a full bodied exquisite sound even when the  
volume's turned up to enable me to hear it in the next room.

Thank you, 73,

--  
Don Kuenz KB7RPU
There was a young lady named Bright Whose speed was far faster than light;
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Re: For audophiles
typo corrected below

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er flows all over y'r hat.
Quoted text here. Click to load it

That's the best place to kennel Cretin the insult dog. Him and his  
little buddy further up keep insisting that my own mixer amp  
http://michael2.home.crcomp.net/electronic/mixeramp/index.php suffers  
from distortion. They apparently use their ESP to diagnose it.
    Anyhow, your jpg shows up just fine for me. My own circuit uses a
TEA2025B. It delivers a full bodied exquisite sound even when the  
volume's turned up to enable me to hear it in the next room.

Thank you, 73,

--  
Don Kuenz KB7RPU
There was a young lady named Bright Whose speed was far faster than light;
We've slightly trimmed the long signature. Click to see the full one.
Re: For audophiles
typo corrected below and now link below fixed

Quoted text here. Click to load it
er flows all over y'r hat.
Quoted text here. Click to load it

That's the best place to kennel Cretin the insult dog. Him and his  
little buddy further up keep insisting that my own mixer amp  
http://crcomp.net/electronic/mixeramp/index.php suffers from distortion.
They apparently use their ESP to diagnose it.
    Anyhow, your jpg shows up just fine for me. My own circuit uses a
TEA2025B. It delivers a full bodied exquisite sound even when the  
volume's turned up to enable me to hear it in the next room.

Thank you, 73,

--  
Don Kuenz KB7RPU
There was a young lady named Bright Whose speed was far faster than light;
We've slightly trimmed the long signature. Click to see the full one.
Re: For audophiles
On Monday, October 21, 2019 at 5:23:15 AM UTC-4, Jan Panteltje wrote:
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I don't think really know Phil.  That *WAS* Phil being polite!  

--  

  Rick C.

  - Get 1,000 miles of free Supercharging
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Re: For audophiles
Jan Panteltje wrote:

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Please remove it ASAP and pray your reputation hasn't been damaged.
Man, this one is READABLE.

    Best regards, Piotr

;-)))

Re: For audophiles
Piotr Wyderski wrote:
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Readable, yes, but it also has the + and - inputs reversed on
the output amps.

Jeroen Belleman

Re: For audophiles
On Sunday, 20 October 2019 19:28:54 UTC+1, Jan Panteltje  wrote:
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lucky you avoided the LM386. Sound of those not good.


NT

Re: For audophiles
On 10/21/19 5:17 AM, snipped-for-privacy@gmail.com wrote:
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They're nice for a lot of tasks like solenoid and servos, driving small  
brushed DC motors and other applications other than audio. The DIP-8  
version LM386N is very rugged and can dissipate a fair amount of power  
(a small copper heat sink thermal epoxied to the top helps.) It can  
drive a 30mm brushed DC motor like in an RC car.

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