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47 labs 0247 : done, tested, working

Posted 12th January 2012 at 01:18 PM by rjm

A few bumps along the way:

1. Soldered one of the caps in backwards. Removed and fixed, fortunately before power was applied to the board.

2. Soldered one of the transistors into the wrong place. Removed and fixed.

3. Dead channel on power up. Bad solder joint on the emitter of one the output transistors. Eyesight not what it used to be. Found on second inspection, fixed.

4. DAC board not level with cutout on front panel, had to use washers to raise it to the correct height.

Other than that, things went smoothly enough, though I spent more time with tweezers routing lead wires than is ideal for a commercially released audio kit. It's not so much difficult as it is painstaking - and I have quite a lot of experience doing these things so I imagine I had an easier time of it on the whole than most will.

The final result however is aesthetically quite pleasing, well worth the effort and expense. It is unabashedly homebrew in style, but behind the outwardly haphazard appearance it's compact, solid, and precise in the places that matter.

No hum, no noise floor of consequence, very clean sound. More on that later after it's had a couple of days powered up to break in.
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Total Comments 1


  1. Old Comment
    rjm's Avatar
    I would like to add as a comment that I am nonplussed by the plexiglass top cover. While it is neat to show off the internals lit by white LEDs - quite a conversation piece actually - it's easy to scratch, attracts static electricity, and offers no shielding for the internal components.
    Posted 12th January 2012 at 02:00 PM by rjm rjm is offline

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