There are two parts lists in this thread: http://www.head-fi.org/forums/showthread.php?t=30015 Which circuit board layout will you use? Another option could be to buy a Stax amp. Some modifications are probably needed.

Someone just starting with AVRs I would recommend using C and the CodeVisionAVR C compiler. This book covers AVRs, C and the CodeVisionAVR C compiler. The hardware tools for AVRs are pretty reasonable. Prices for Atmel's own tools are: programmer: $30, development kit: $80, in circuit...

One more scope pic.

Here's some scope pics from one of my Borbely amp boards. The top signal is the input, bottom is output into a 44 ohm dummy load. 50 Hz 100 Hz 1 KHz 10 KHz 100 KHz 250 KHz

I got the boards yesterday. Thanks MisterX!

3 boards please.

Here's a SMD cmoy in progress: http://www.diyaudio.com/forums/showt...threadid=39952

MCM and bdent have 2sc2705 in stock.

I haven't listened to it yet. I need a few more parts before I can put it in an enclosure.

yhmzzz, Do you know if anyone have compared the Borbely with other well-known designs?

Here's a pic of the assembled boards. Boards (147 KB)

The headphone jack could be a Neutrik NMJ6HC-S, available from Mouser and Farnell.

I finished the amp boards, which was straigtforward. I've done some testing and I haven't noticed any problems. I'll try to post some pics next weekend.

bdent.com has Hitachi 2SJ77/2SK214 in stock.

I'm also building the Borbely, but I bought the kit. (146 euros shipped.) Please keep us updated on your progress.

http://www.bdent.com/ You're not building the Borbely amp, are you?

I got my boards today. Thanks Raul

For those who haven't followed davebot's thread in the amp forum, this it probably the commercial version of the Borbely headphone amp: http://www.auralaudio.com/products.asp?prodid=1094 Review: http://www.6moons.com/audioreviews/aural/audition.html EDIT: fixed review link

Quote: Originally Posted by kevin gilmore i've spent an hour looking at the schematics for the two audio research pieces you have and have come to the conclusion that the closest thing sound wise would likely be the borbely headphone amp. Unfortunately unless you plan on building it...

I ordered the amp kit (without PSU) from Borbely Audio. I'll use the DACT CT2 50k as a volume control, since I have one of these and it's not used for anything at the moment. I don't know what I'll use to power it. Erno Borbely recommends a dual power supply.

davebot, I've been pretty busy lately, so I haven't had much time for DIY projects. I might look into this project soon, since Borbely Audio and Audiokits.com have a kit sale now. If I do, I'll post here.

Teflon PCBs are available for the Borbely headphone amp: http://www.borbelyaudio.com/index22.htm

Quote: Originally posted by Tomo The voltage drop over the mosfet is relatively small. However, what you probably need is something that is rated above 20V. I've been looking at the datasheet. I think the voltage drop is listed as "Diode Forward Voltage". It's specified to 2.5V...

There's a voltage drop over the MOSFET, so the cap wouldn't see 15V? Anyway, it's probably better to be safe.

LM317/LM337 PSU.