On one of the forums, I do not remember which one though, Tomo said the MOSFET ( IRF510?) like to see 20V across. I think, it was in reference to Szekeres. This is what prompted my question.

After thinking about this project I started to have doubts. It looks like I will waste a lot of power with no reason. I do not have 600 Ohms headphones either and this higher supply voltage is for a reason..... I am slowly getting towards Szekeres then. But, the first step to get parts has been...

Hello Wakibaki, No argument was on my mind. There are to many threads around the net on different audio forums, about differences among capacitors, resistors, and volume pots, which turned violent. And I do not want to stear the pot. That was not my intention. My reply was more of a question and...

sorry for double post...

Hello, this is very interesting thread. Interesting and ...very long. I might miss something, but I have a question. Forgive me if someone already asked that question.Does it make any sense to judge op-amp sound quality in random circuit with op-amp rolling? As I understand correctly every...

Hello Wakibaki, Thank you very much for graphs. Hmmm, that looks interesting. OK, as per recommendation I will go with dual PSU and LM317HV regulators. I bought transformers today, TRIAD F7-36. Is there any reason to use IRF610 transistor instead of IRF510? I have both types and obviously I...

In above mentioned Headwize link, Tomo talks about regulated PSU and use of LM317: " 5. If I use an LM317 based power supply, am I getting too close to the regulator's limit? Two of these circuits will draw almost 1.3A continuously, which is already close to the LM317's limit. A LM338...

Wakibaki, The Headwize listed SOL schematic is here (first post): http://web.archive.org/web/20070630143743/http://headwize.com/ubb/showpage.php?fnum=3&tid=6717&&action=seekpost&pid=57397#57397

OK, sorry for obvious questions. I have posted questions last night without spending time today on reference to headwize. It looks like 45V supply voltage schematic is for Hi-Z headphones. I will go with this one then. I also see there reference to PSU with minimum 30VA trafo. What is...

Thank you very much for all answers. I will start with SOL, but which version of published schematics should I choose: one from wiki with 45 supply voltage or Headwize one with 12 volts? I am a beginner, but somehow I would lean towards 45Volts even if that would require bigger heatsinks. But...

Hello, I would like to build single ended class A amp. Szekeres was always on my list, but meantime I have remembered another mentioned project from old Headwize forum; the PRR designed SOL. I was looking for the schematic and finally found it. What is the difference between them? I know that...

Hello, Thank you very much for the response. I that case I will try to replace op-amp with buffer. Cobaltmute, You said thesame issues may occur with used buffers, do you mean oscillation? What can be done to this circuit not to have oscillation problems?   Thanks

Hello again, Can anyone assist me with the above question? Unfortunately Headwize forum is still down and I am not quite sure there are more forums like HeadFi and Headwize. I just need help with inserting output stage into negative feedback.   Thanks !!!

Hello, My name is Tom and I have just joined Head-Fi. Electronics used to be my hobby back in elementary school almost 40years ago. Unfortunately, my life took different course and I followed other opportunities than something what used to be in my heart. Of course music was and still is my...