Can I use this power transformer for my ssl

[Housemeister]

Hi

Sorry for asking such dumb questions but i dont know enough about electronics to decide this by myself.
The Partlist says 2x15V 20VA. Can I use a transformer with 2x15 30VA ( i guess it is no problem but i would like to be shure ), cause i cant find a 20VA Transformer for a good price? How much Ampere should the transforme have ?

How much Ampere should the fuse in the IEC have ?

Thank you. Best Regards
Jasmin

 

[Neeno]

Yes, it's like electrolitics caps voltage... you can always use a bigger cap (voltage) but not the opposite (contrary ???)...

Arhghgh... my english is soooo baaaad...
I hope you'll understand...

Neeeeeeeeeeeeeeeeeno

 

[Housemeister]

All understod

thank you Jakko, Neeno.

Best Regards
Jasmin

 

[matthias]

you can use anything upwards 10VA

 

[Coldsnow]

"Fuse - it's on the schematic. 315mA, or 0,315a. "

Would you use the same fuse for North American power supply?

 

[PRR]

> Would you use the same fuse for North American power supply?

Fuse value is not THAT critical.

At one extreme, it should be much-less than the current that will set your line-cord on fire. For US-market line cords, much-less-than 15 Amps. This is not a problem for mike-amp work.

At the other extreme, obviously it must carry the load. Mike amps use less than 10 watts, and 10W at 120V is 10/120= 0.0833 Amps. You can't even buy a fuse that small (not rated to break a power-line).

However: while the Power Consumed may be less than 10 Watts and 0.08A, small cheap transformers let a lot of AC current slosh through them. Low Inductance. I had one 10VA transformer that always blew a 0.25A fuse, even without a load. A 0.5A fuse held for years. So you may find that you have to go to 0.5A just to feed the transformer losses.

If a DC supply has BIG capacitors, the turn-on surge may pop a fuse. Turn-on can be as bad as 10 times the rated power capacity. So you might need a 0.833 (or 1) Amp fuse if you have BIG capacitors on a 10VA transformer.

A 1 Amp fues will protect the transformer from a dead short. But it will not protect a small transformer from an overload. If somehow it was sucking 0.5A at 120V, that's 60 Watts which will slow-cook a 10VA transformer. Many Euro transformers have thermal cut-outs to protect against this unusual condition. In the US we just let them stink and die. Transformers can burn, but it isn't usually a big deal (opinions vary). I dislike transformers in plastic boxes, especially the more flammable plastics.