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Lehmann headphone amp clone on aliexpress
Lehmann headphone amp clone on aliexpress
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Old 3rd October 2017, 03:48 AM   #1
Aatto is offline Aatto  United States
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Default Lehmann headphone amp clone on aliexpress

what do you think ?
Lehmann headphone amp clone on aliexpress-lehmann-png

component placement looks like the original
aliexpress link
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Old 3rd October 2017, 05:34 AM   #2
ammel68 is offline ammel68  United States
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Lehmann headphone amp clone on aliexpress
Quote:
Originally Posted by Aatto View Post
what do you think ?
These "Lehmann" clone boards have been discussed many times here before.

Having personally built a couple of these "Lehmann clones" in the past, I would forgot about this sh_tty sounding design and move on to something else!
Utilizing a dual op-amp(OPA2134 or whatever dual JFET op-amp you prefer) for the VGS is one of the limiting factors here vs. using a single op-amp for each channel.

Look for a JLH headphone amp PCB if you're determined to try one of these Chinese clone headphone amps.
The all discreet JLH desing sounds MUCHO better IMHO, but will require a DC servo to keep the offset from possibly "frying" your headphones.
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Old 3rd October 2017, 09:42 PM   #3
phase is offline phase  United States
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The clone amp would be great if you like changing the op amps a hundred times trying to make it work better.
I would tend to get one of these myself;
HIFI FET INPUT MOS Class A headphone amplifier ALPS ASSEMBLED BOARD GOOD SOUND | eBay
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Old 4th October 2017, 03:44 AM   #4
Aatto is offline Aatto  United States
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huh, i was just wondering how the hell they cloned a 1000$ product into a 30$ kit !
i got another board from the same company i believe and the seller claimed that this circuit is also based on lehmann :
GZLOZONE Lehmann HV-4 Headphone Amplifier Kit With ALPS 27 Type Potentiometer

i put it together with its all crappy components, the only thing i changed was the coupling caps which i replaced with solen ones and man it surprised me, it sounds fantastic, no noise no hum , dead quite and looks like a good design overall, so i got lucky you think ?
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Old 4th October 2017, 03:52 AM   #5
abraxalito is offline abraxalito  United Kingdom
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Just say 'no' to classAB for headphones. As 99% of cans only need peak powers of a few hundred mW, classA is the way to go.
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Old 4th October 2017, 03:55 AM   #6
Aatto is offline Aatto  United States
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Quote:
Originally Posted by abraxalito View Post
Just say 'no' to classAB for headphones. As 99% of cans only need peak powers of a few hundred mW, classA is the way to go.
i like that !
i found this for JLH :
NEW JLH HOOD1969 Class A Headphone amplifier PCB

what do you think ?
any suggestions on ebay/aliexpress ?
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Old 4th October 2017, 04:05 AM   #7
abraxalito is offline abraxalito  United Kingdom
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From my limited experience of browsing (but not buying) amps Zerozone is one of the better guys. The full kit is only about $5 more than the bare PCB, a real bargain. To protect your precious cans I'd AC couple the output rather than rely on trimming the DC offset though.
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Old 4th October 2017, 04:27 AM   #8
Aatto is offline Aatto  United States
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huh, good idea, i did some research on it and i confused myself !, what value do you suggest ?
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Old 4th October 2017, 04:32 AM   #9
abraxalito is offline abraxalito  United Kingdom
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It really depends on the impedance of your particular cans. I have Superlux HD668Bs which are 56ohm and I put 1500uF. For lower impedance use more, higher use less. So for e.g. 28ohm, try 3300uF.
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Old 4th October 2017, 04:37 AM   #10
Aatto is offline Aatto  United States
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i got 250ohm, so about 300uf ?
few more questions :
- does the cap have any effect on the sound, i read it effects bass., is the brand effect the sound character , like solen, m-caps ... ?
-is there any more general solution ? like if i want to switch between different impedance cans without worrying about cap value ?
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