Advice Selecting ebay Headphone DIY Board

The ebay b22 is a blatant rip-off of the AMB b22 which does not come as an assembled board but can be bought as a PCB from AMB. The chinese knock off will likely come with fake transistors or transistors other than the specified Toshiba devices. Plus, it's stealing. It will likely burn down your house or at best, give you bad karma.

Honestly, by the time you figure out a power supply and wire it up etc. you might as well solder up something yourself...at least that way you will know you are getting good parts and not fake junk.

AMB.org has lots of projects (the b22 being the ultimate), hoefully there will be a Pass-designed DIY project with boards sold here soon:

http://www.diyaudio.com/forums/pass-labs/271662-new-passdiy-headphone-amp-coming-soon.html

Also, I would look at EVUL's F5 headphone amp which can be built cheaply and easily on protoboard:

http://www.diyaudio.com/forums/pass-labs/271926-f5-headamp.html
 
Here's the headphone amp that goes into Akitika's GT-101 preamp.
It requires +/-12 Volts, and it comes as a kit, so that might disqualify it from your consideration. However, it sounds great, it's inexpensive, and it comes with clear instructions.

Headphone Amp

Dear djoffe,
Thank you for the recommendation ! Have you built the amp ? Interested in feedback on the SQ.

All the best
 
The ebay b22 is a blatant rip-off of the AMB b22 which does not come as an assembled board but can be bought as a PCB from AMB. The chinese knock off will likely come with fake transistors or transistors other than the specified Toshiba devices. Plus, it's stealing. It will likely burn down your house or at best, give you bad karma.

Honestly, by the time you figure out a power supply and wire it up etc. you might as well solder up something yourself...at least that way you will know you are getting good parts and not fake junk.

AMB.org has lots of projects (the b22 being the ultimate), hoefully there will be a Pass-designed DIY project with boards sold here soon:

http://www.diyaudio.com/forums/pass-labs/271662-new-passdiy-headphone-amp-coming-soon.html

Also, I would look at EVUL's F5 headphone amp which can be built cheaply and easily on protoboard:

http://www.diyaudio.com/forums/pass-labs/271926-f5-headamp.html

Dear Hikari,
Thank you so much for your message, I had incorrectly thought that the B22 was "open source" and was not aware that is was an AMB design.

I will take a look at the Pass-designed project. The EVUL's F5 looks very interesting. Spent the morning going through all 44 pages.

Thank you for pointing me in the correct direction.

- Mark
 
Also, I would look at Richard marsh's headphone amp. You can but the design write up from linear audio...it's a 3 dollar download. A kit is available from tech diy. It looks good too. Spend the 3 bucks on the article. It's good. It's a little more complicated design, jfet input with a diamond buffer bjt output stage.

Personally, I like the jfet input, mosfet push pull designs like the f5. I think the f5 headamp would suit you well, it's easy to build...the jfets are available from the store here. Build the amp on protoboard...it's only like 10 components. Use a simple lm317/337 power supply or the cap multiplier in the article. Or the excellent Jung super reg (boards available here). It would make a feed preamp too. The galaxy cases available from the store here can be had for 60 bucks or so, the quasi heat sink should work. Get a transformer from antek and your done. Probably a $150 build.