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Stabist 18th September 2005 12:43 AM

Starting my BGT boards based A30
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Finnaly the project moved from the dead point :D

A30 - based on BGT boards :D

Boards are 2/3 populated - the thing missing are transistors and 3W resistors ... I've miscalculated a bit - I completely forgot that A30 is derived form A3 - and so there is A LOT of 0.47 resistors (and I have some 1R ones at hand - but not enough of them :((( )

So it'll have to wait for few days to finish that ...

But then again - in the meanwhile maybe I'll find time to drill holed in heatsinks so I'll can test the boards :D

Btw - I have a Q about PSU:
in the test phase (and if everything working allright, probably also for finished Aleph) I'll use 2 160VA EI trannies ... And now I have 2 choices for capacitors:
- 8 new ROE 10.000uF/40V
- 4 used Sprague 36D 24.000/30V - but they are working OK ...
What would you guys use - newer stuff (but I find 40.000uF per rail a bit low) or 30% higher total capacitance?

jleaman 18th September 2005 04:56 AM

a 160va tranni for a single aleph might be pushing it.. id get a higher VA for sure.

Stabist 18th September 2005 06:56 PM


As said - first it will be checked with those 2 trannies (becasue they are waiting to be used in some aplication for so long) - altough I think they will not have any problems - they are designed to work 24h/day with nominal power (that is 160V) and in those conditions they supply 18V on secondaries :D Regarding the fact that A30 has around 100+VA high consumption - they should have 50VA of advantage ;) :D

Stabist 26th September 2005 11:21 PM

2 Attachment(s)
Progressing :D

Stabist 26th September 2005 11:22 PM

2 Attachment(s)
I guess it's comming to the point where heatsinks will be needed :D

So it's chassis building time :D

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