Schematic for Ebay/DIY amp kit A1 MK3-PRO
Aug 17, 2015 at 11:12 AM Thread Starter Post #1 of 2

MrDeSaussure

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Hoping someone on this wonderful forum has some information for me regarding an amplifier kit I bought on Ebay.
 
I've bought and assembled a few amps, (both headphone as well as speaker power amps) so I have some fairly decent experience with assembly, as well as "intuitively" reading a PCB and installing components, however, this is the first time that I've ever been confronted with a TOTAL lack of documentation.
 
This is the kit that I bought, and it did arrive basically as described. However, it appears that the board has gone through an upgrade/ version update, and even the picture of the board in the picture is not what I received. What I DID receive was labeled as "A1 MK3-PRO"  "Classic amplifier MKIII-PRO"
 
http://www.ebay.com/itm/DIY-A1-headphone-amplifier-kit-amp-kit-case-transformer-RCA-L155-47/121664301953?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D29981%26meid%3Deff5c77c54384b75ae52107c502a5ba9%26pid%3D100005%26rk%3D1%26rkt%3D6%26sd%3D231617412525
 
It looks very very similar to the amp in the pic, with even more components. I realize that buying off of ebay is "caveat emptor" but I'm hoping someone on here has potentially built one before, and might be able to send me a pic of the finished board view.
 
Aug 17, 2015 at 12:49 PM Post #2 of 2
Based solely on the name, maybe it's a clone of the Beyerdynamic A1?
 
Pics online don't seem to match up, I did find this clone which has some similarities...
http://www.hifivision.com/diy/26083-diy-beyerdynamic-a1-clone.html
 
Sorry, that's the best I can think of.
 
 
edit: yep looks like a clone, so just dig around for the one that looks like the closest match
 
http://www.digok.com/p11148354-e3-headphone-amplifier-board-and-upc1237-protection-based-on-beyerdynamic-a1
 
http://www.aliexpress.com/store/product/Assembled-E3-Headphone-Amplifier-Ref-Beyerdynamic-A1-With-UPC1237-Protection/517652_728294391.html
 

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