Some people may have noticed that my thread about my headphone amp project disappeared. The reason is that someboby reported me and now I'm a member of trade and the limit for qualify for this is zero. This means (if I have understood it correctly) that I'm not allowed to share anything such as...

I have made some IC adapters which may be the best in the world, only in my computer so far but what du you think?   Schematic and pcb layout here: http://sjostromaudio.com/adp05r0.pdf

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Just wonder what happened with the group buy rules? Last sign of life was Aug 2005. http://www4.head-fi.org/forums/showthread.php?t=140490

Today I have made the layout ready of a super regulator based power supply, 230/115 VAC, +- anything out. Basic voltage is 15 volts but up to 24 volts seems to be possible. Output current at 15 volts is 200-300 mA but this is only a guess. The size of the board is 137 x 102 mm, 5.4 x 4" I...

I currently working on QRV-06 meets JSR-01. Identical to the amp QRV-06 but with bias compensation and optional DC-servo with AD8610, OPA134 or whatever. Four Jung regulators similar as my JSR01, dual mono with dual transformers also. A complete unit with 230 VAC in, signal in and...

I have made a diamond which Glassman did copy and made boards of and offered to you as you may remember. http://www4.head-fi.org/forums/showp...13&postcount=5 His version was custom made to fit the PPA amp. I have now plans to change my pcb which will be doublesided with groundplane and...

http://www.diyaudio.com/forums/showt...177#post492177 Something to think about! Morsel and the gang, what do you say about Bruno's opinions?

Hi! I am going to convert my QRV-04 to AD8620 + TPA6120, otherwise rather similar. The pcb will be a bit smaller. Anybody interested in a group buy?

Hi! A new headphone forum has started in Sweden. The only one. It will take a while until it reaches the level of head-fi but it's always nice to speak/write in your native language and also know the culture. http://personalhifi.2.forumer.com/ nerd or nörd in swedish is nowadays a...

http://focus.ti.com/lit/ds/symlink/tpa6120a2.pdf Check out this IC! Anybody who has come near this IC? 0.00014% THD + N 120 dB S/N

Hi! Is anybody interested in a small cute SMD current feedback totally discrete built headphone amp? Those of you who are interested can download the schematics for simulation. I have used the freeware LTSpice. http://www.diyaudio.com/forums/showt...642#post266642 I got inspired when I...

What has happened to www.meier-audio.com? It's now a **** site. I got kind of surprised when I tried to surf to Jan Meier's website. http://home.t-online.de/home/meier-audio/

http://www.headphoneamp.co.kr/bbs/vi...esc=asc&no=188 Some korean guy has built my experimental current feedback "Mark Alexander" amp but the text is only?? ??? ??? ???? ??????? ???? Can any korean person give me a short translation? Tried Altavista without success.

Can anyone explain the electrical reason for using mutli-loop feedback TOGETHER with modern opamps? Years ago I can imagine that there were benefits of this tecnique but now?

My overkill headphone amp works! Today I tested the last part, the BJT output stage. The amp is tested with the cute MOSFET's IRFD120 and IRFD9120, small DIL-4 package. I'm surprised that they can dissipate so much heat. I have tested 250 mA = 120 deg C hot! 200 mA = 70 deg C Can drive any...

Here you can find my cool SMD headphone amp. I have got samples from AD and Texas. I will test a OPA134, OPA627, AD8610 and a SMD BUF634. I'm amazed that you can get 3 samples of OPA627 for free!! Anyway, the pcb's are arriving any day now. This is my first SMD audio project. I do it all...