Starving Student PCB's
Nov 9, 2018 at 8:21 PM Post #362 of 392
Nobody has an extra one???
Would you like a photocopy or detailed picture with measurements so you can overlay on a Perf bored and do some point the point and just lay down your own traces or wire . I have a set I have not populated the board yet sitting on my shelf. Unless you must have a board I know it is much easier and convenient . My first attempt at a Purf board but without a template just by Eye was pretty messy . But it was a good learning experience .
 
Nov 9, 2018 at 9:41 PM Post #364 of 392
C805D6A0-861E-4D8B-86EA-7191BFC8774A.jpeg
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C805D6A0-861E-4D8B-86EA-7191BFC8774A.jpeg
Thanks guys! I really like using a board for aesthetics. PM sent
 
Nov 11, 2018 at 2:51 PM Post #366 of 392
BOM is here:
https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=d7adb25dd2

I did a little writeup for Reddit that you might find useful. There's a copy quoted here:
https://www.head-fi.org/threads/millett-starving-student-hybrid-amp.319231/page-469#post-12448808

Pics of my build here :) :
https://imgur.com/a/7IWB9

I'll drop it off at the post office today, it'll go out in the morning. Tracking here:

https://tools.usps.com/go/TrackConfirmAction_input?qtc_tLabels1=9400109699938948388584
 
Dec 20, 2018 at 4:28 PM Post #370 of 392
BOM is here:
https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=d7adb25dd2

I did a little writeup for Reddit that you might find useful. There's a copy quoted here:
https://www.head-fi.org/threads/millett-starving-student-hybrid-amp.319231/page-469#post-12448808

Pics of my build here :) :
https://imgur.com/a/7IWB9

I'll drop it off at the post office today, it'll go out in the morning. Tracking here:

https://tools.usps.com/go/TrackConfirmAction_input?qtc_tLabels1=9400109699938948388584

I was looking at your BOM, and for C3a and C5a, you used film capacitors. However, on the schematics for the 12au7 version, it says to use electrolytic capacitors. Was this a mistake or was it intentional? Thanks!
 
Dec 20, 2018 at 4:35 PM Post #371 of 392
Definitely intentional, but are you sure about that? C3a/C5a are bypasses for C3/C5 which are electrolytics. I'dI be strange to bypass an electrolytic with another electrolytic. Also, 0.22uF is a smaller value than most modern electrolytics come in.

In general I don't use electrolytics with values lower than 2.2uF or so. Films are superior in every aspect.
 
Dec 20, 2018 at 4:43 PM Post #373 of 392

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Dec 20, 2018 at 4:49 PM Post #374 of 392
Zero harm. Electrolytics are inferior in every respect except for capacitance per unit volume.

Looking at that schematic, I think the creator just got "lazy" with the symbols. The symbol used doesn't really mean electrolytic it's just a polarized cap symbol. If using an unpolarized film cap you just ignore the polarity. The intent is clearly for it to be a film bypass.
 
Dec 20, 2018 at 4:55 PM Post #375 of 392
Zero harm. Electrolytics are inferior in every respect except for capacitance per unit volume.

Looking at that schematic, I think the creator just got "lazy" with the symbols. The symbol used doesn't really mean electrolytic it's just a polarized cap symbol. If using an unpolarized film cap you just ignore the polarity. The intent is clearly for it to be a film bypass.
Thanks!
 

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