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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 19th February 2014, 04:30 PM   #11
evanc is offline evanc  United States
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General Tubelab PCB question...
mines been working like this for some time. The small silver heatsink[Q1 Q2 U2 U3] gets hot...
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Old 19th February 2014, 05:47 PM   #12
boywonder is offline boywonder  United States
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Default keeping the smoke in.....

Moggi: When populating the bottom of the PCB, triple check the polarity of anything that has polarity, like diodes, electrolytic caps, mosfets, and the tricky one, the filament regulator (5 legged critter).
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Old 19th February 2014, 05:50 PM   #13
moggi1964 is offline moggi1964  England
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I saw that you mentioned that on your build, boywonder; the 5 legged beast being the most challenging it seems.

Thanks for the advice; I need to get my head around what the implications are of working on the other side of the board.
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Old 19th February 2014, 06:08 PM   #14
wicked1 is offline wicked1  United States
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I soldered the 5 terminal regulator to its pads, laying flat off the back of the board.
So, all the pins are fully extended, not bent, not cut, And the ends are soldered to the pads. Then the regulator extends past the pcb where I have it mounted to a heat sink.

(which is why on the photo of mine a page back, the vent holes by the regulator area extend way out past where the PCB is)
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Old 19th February 2014, 09:33 PM   #15
moggi1964 is offline moggi1964  England
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Thank you.
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Old 21st February 2014, 12:37 AM   #16
moggi1964 is offline moggi1964  England
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I think I am going to put the taller caps under and have everything else on top.

C5; 6, 8 and 10 for example can go under, maybe others too.

This should give me shorter standoffs and thereby the tubes will be more above board than below.
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Last edited by moggi1964; 21st February 2014 at 12:42 AM.
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Old 21st February 2014, 12:03 PM   #17
Spica is online now Spica  Canada
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General Tubelab PCB question...
EVANC

That is one very beautiful enclosure!!
I wish my woodworking skills were at your level.
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Old 21st February 2014, 12:09 PM   #18
moggi1964 is offline moggi1964  England
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Quote:
Originally Posted by boywonder View Post
Moggi: When populating the bottom of the PCB, triple check the polarity of anything that has polarity, like diodes, electrolytic caps, mosfets, and the tricky one, the filament regulator (5 legged critter).
So when I put it on the bottom the negative terminal is soldered to the same 'hole' it would have been on top, right?
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Old 21st February 2014, 01:26 PM   #19
boywonder is offline boywonder  United States
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The leads of all of the devices listed above would go into the same PCB holes as they would if top mounted. The filament regulator is the only brain-twister, as it has 5 leads.
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Old 21st February 2014, 03:31 PM   #20
moggi1964 is offline moggi1964  England
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Yeah, I think I am going to keep that one on top

Thanks mate.
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