taliska
Well-known member
anvl said:Hi. For European builders I think there are three options for powering:
A) Using two different power transformers for 220v.
- 230v prim to 18v+18v sec
- 230v prim to 120v sec
Both primarys are connected on IEC plug and both secundarys are connected directly to PSU board... that's all.
B) Using Gyraff mode (back to back). The first tx should be 230V prim to 18+18V sec (transformer number 1) and the second should be 120V prim to 18V sec (transformer number 2), but used in reverse mode, which means that you should connect the 18V of tx number 2 as a prim to one of the two 18V of tx number 1.
C) Using Abe's suggestion. Dual primary trick, changing R10, R11, R12 to 3K9 @ 5watt resistors and change the 100V zener to a 5W one (just to be safe, might be unnecessary).
I used option A) and it's working in a 2U case.
Regards
Cool, thanks for the info! ;-)
You forgot:
D) Don Audio toroid.
Apologies, if I seem to be flogging a dead horse, but I guess what I'm really trying to get to the bottom of is the space constraints for the various solutions for EU builders. Reading between the lines, it seems like the following is true:
If using A) or B) or D) then 2U or larger case is required.
If using C) then 1U case is possible (though I'm not going to choose this for reasons already mentioned - safety).
I haven't bought a case yet, so it's not a big deal for me...though I'm fast running out of rack space which is why I was trying to hit 1U...
I think I'm going to go away and have a think about it, but at this point in time I'm leaning towards D) as the price doesn't seem particularly different to the cost of two toroids and at least the fields will be entirely coincident which can only be a good thing! ;-)
Cheers,
Kaz