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Old 27th June 2008, 07:43 PM   #1
petesjoy is offline petesjoy  United States
diyAudio Member
Join Date: Jan 2008
Default Portable Tube/Hybrid Headphone Amp

This is my first post.I have been reading the forums for quite sometime now.Being new to electronics I have found the information here to be invaluable.
The attachments to this post contain my version of the YAHA.It is a portable LiIon cell powered YAHA consisting of 2 subminiature pentodes connected as triodes followed by a dual opamp buffer. It will charge or run off of any usb port. I built this to run from my laptop or mount my mp3 player to take on walks.The battery lasts about 20 hrs with 60ohm headphones,or around 15 hrs for 30ohm headphones. The parts cost under $100.00. I am very pleased with the sound, but I'm sure there's room for improvement.

http://g.photos.cx/GRAPHS-dd.jpg http://g.photos.cx/PARTSLIST-27.jpg http://g.photos.cx/SCHEMATIC-84.jpg http://g.photos.cx/SUBMINI-YAHA-da.jpg
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Old 15th November 2009, 12:57 PM   #2
Steven-H is offline Steven-H  United States
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Join Date: Jan 2007
Location: The 1st State
What ever happened to this ?
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