I fixed one of these for IronDreamer a year or so ago. If you can't find anyone local, send me a message. -Dan

Quote: Originally Posted by dgardner Yes, there are still boards left over from the past group buys. -Dan I also have matched pairs of the 2SJ74 and 2SK170 to replace the hard-to-find 2SJ109 and 2Sk389 parts if anyone needs some.

Quote: Originally Posted by Pars Current consumption for the Dynalo if I remember right is around 100mA per channel. I would plan on perhaps 200mA per. About 150ma per rail is typical.

Quote: Originally Posted by tomb DIY RESOURCES - Kevin Gilmore DYNAMIC HEADPHONE AMPLIFIERS and POWER SUPPLIES Yes, there are still boards left over from the past group buys. -Dan

Quote: Originally Posted by Kruemelix Do the HS-TWS heatsinks also fit for the amp board? The origin of the HS-TWS heatsinks stems from the fact they were cheap, readily available, and about the right size. They are not special in any particular way. If you can scrounge for...

Think of a servo as a mathematical building block that INTEGRATES the small amount of DC signal on the amp's output. This is continuously added up over a time period of several seconds or more and stored on a capacitor in the feedback loop of a simple opamp circuit. The voltage on the servo's...

The dynalo and dynahi amps have a very similar circuit topology. Both have relatively poor power supply rejection. So, very quiet power supplies and tracking circuits are a way to maximize overall performance. I think that a simple LM317 / LM337 circuit or a 7815 / 7915 circuit solution is...

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John Hardy's, Rochester MN

I have a big collection of CDE caps from 1pf to 1000pf. If you only need a few peices, I give 'em to you for free if you pick up shipping... -Dan

Quote: Originally Posted by Juergen Unfortunately I don't have a spare board. I can supply replacement PCBs if necessary. Plenty left from the headwize group buy...

Quote: Originally Posted by Juergen I have made a few inquiries. Do you know if there is a way to tell if it is a first round board? I seem to remember that the trimmer was not on the earlier boards? I have one piece of the first round boards. It was the small cap layout. One...

I have been meaning to post something helpful to the victims of OPA541 smokage. I'm not sure that I can. This same thing happened to me several months ago when I built up my first Dynahi PSU board. At that time, I was using a 38VAC transformer which was way too high, and I was also using a...

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