Well, the parts arrived and i spent a night going thru the parts and inventoried to make sure we have all the parts in the list of materials (BOM). Took the time to measure all the resistors, count the diodes, various transistors, voltage regulators, etc.
Here is the link of the headphone amp that I am building:
http://cavalliaudio.com/diy/soha%20ii/main.php?page=overviewYou will find ciruit design information, schematics, board layout, wiring stuff and of course various mods to do after the build or during.
This amp can use both 6 volt and 12 volt heater tubes, via a set of jumpers or DPDT switch and a transformer upgrade. Which I am going to do.
So far the hardest thing is reading the really small letters and numbers on the small transistors, diodes, and various voltage devices. Had to get out the magnifying glass!!! LOL.
Have to take the time and make sure the right parts get installed in the right place, polarity, transistor EBC etc...measure, check and recheck.
The circuit board has small plated thru holes with not much soldering area and has been a pain to solder, but do-able.
I am about 1/3 done installing parts. The T0220 parts are mounted on a heatsink. and you need to install them correctly. I found going to the data sheet for the mounting kit provided diagrams that show how the parts go together.
Taking time to make sure solder joints are well done and no shorts to adjancent lands.
All in all its been fun re-discovering the are of DIY. Its not that hard to do, just common sense and do not be in hurry, if you have any doubts you can post or read the hundreds of comments at the SOHA II build thread at
www.headfi.comWell I hope to get this done in a few more days and start wiring it up to do initial setup. voltages etc..all this is explained on the site I listed above.
Then its on to mounting all the stuff into a nice box etc and mount knobs, on off switches , rca jacks, headphone jack, etc....
I will post more on the experience as it develops!
Alex
