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JLH Class A headphone amplifier
JLH Class A headphone amplifier
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Old 21st April 2016, 12:17 PM   #91
lisoformio is offline lisoformio  Italy
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Is the schematic for this psu available?
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Old 24th April 2016, 03:10 PM   #92
jamesfeline is offline jamesfeline  United Kingdom
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Hello .. yes I have this, I will email to you .. regards
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Old 27th April 2016, 11:19 AM   #93
xrk971 is offline xrk971  United States
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JLH Class A headphone amplifier
I just put it in a wooden box with a toroidal trafo and RCA inputs. Still waiting for 1/4in stereo jack to install. In meantime I had a listen with temporary 3.5mm jack on MDRV6's. Wow the sound is incredible. Deep deep bass and soaring clear highs.

Needed the box to use this at work. Most of my projects don't have a real box - I found that little craft boxes like this are convenient and inexpensive. This one was $5 from Michaels.

Click the image to open in full size.
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Old 7th May 2016, 12:41 PM   #94
jamesfeline is offline jamesfeline  United Kingdom
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Looks like a nice little build .. well done, does it sound Ok ?
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Old 7th May 2016, 12:52 PM   #95
xrk971 is offline xrk971  United States
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JLH Class A headphone amplifier
This little amp works like a charm - well beyond the $20 cost of the board, $11 for toroidal transformer, $5 for misc RCA input and TRS stereo out jack. Btw, I am using the GLS Audio 1/4in stereo TRS jacks and they are really nice. All metal high quality with a decisive click. They look bullet proof and will last forever.

One issue I have and I think it's because I don't have the main board connected to earth ground is that when the volume pot is not on full output there is hum. So I need to fix that (also for safety).

Sound wise it's a fantastic amp and I am looking forward to trying some better headphones than my 20yr old Sony's on them.

I am thinking of building my own headphones with a nice Visaton B80 full range driver. Will 3D print the yoke and headband. Ordered some foam cushioned earpads alread. There is a thread for that in Fullrange forum.
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Old 7th May 2016, 01:46 PM   #96
jamesfeline is offline jamesfeline  United Kingdom
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great .. thanks for the update ..
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Old 14th May 2016, 08:41 AM   #97
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by xrk971 View Post
..................One issue I have and I think it's because I don't have the main board connected to earth ground is that when the volume pot is not on full output there is hum. So I need to fix that (also for safety). .......................
If it's all enclosed and there are no metal/conductive parts to touch, then Safety is much less of an issue. Just use a close rated fuse. Make sure any equipment you connect it to, also has a close rated fuse.

Try to use twisted pairs for more of your wiring.
Connect any non-audio internal metal work to a common ground reference.
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regards Andrew T.
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Old 24th November 2017, 04:23 PM   #98
jamesfeline is offline jamesfeline  United Kingdom
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Quote:
Originally Posted by AndrewT View Post
James,
can you attach the pics missing from post1?
Hello sorry for the delay .. please find a few pics from the 1st posts .. this unit has long gone to a happy owner
Attached Images
File Type: jpg Camera back up pics (120).JPG (541.3 KB, 224 views)
File Type: jpg Camera back up pics (121).JPG (533.6 KB, 220 views)
File Type: jpg Camera back up pics (122).JPG (596.6 KB, 211 views)
File Type: jpg Camera back up pics (123).JPG (577.3 KB, 202 views)
File Type: jpg Camera back up pics (126).JPG (528.0 KB, 83 views)
File Type: jpg Camera back up pics (128).JPG (529.7 KB, 88 views)
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Old 24th November 2017, 04:25 PM   #99
jamesfeline is offline jamesfeline  United Kingdom
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I have a new unit in construction currently .. but still work in progress .. so will update when I have more to show

regards
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Old 14th February 2018, 03:43 PM   #100
jamesfeline is offline jamesfeline  United Kingdom
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Hello ... just completed the main head phone amplifier PCB preparation .. nice and clean etc.
just a few pics before construction
Attached Images
File Type: jpg IMG_0587.jpg (521.5 KB, 50 views)
File Type: jpg IMG_0588.jpg (552.1 KB, 43 views)
File Type: jpg IMG_0589.jpg (533.3 KB, 40 views)
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