[sdiy] Voltage Regulators

[Ingo Debus]

Am 17.10.2008 um 10:07 schrieb Florian Anwander:

> Though it is not very common: I always use fuses between the  
> transformer and the rectifier.

If a fuse on the secondary is required or not depends on the  
transformer type. There are short-circuit-proof types which don't  
need a fuse (usually very small transformers). For all other  
transformers a fuse is mandatory. Don't rely on current limiting  
features of the voltage regulator, the rectifier or filter cap can  
also cause a short.

Often there's a symbol printed onto the transformer: two intersecting  
circles with two short lines sticking out of one of the circles. If  
these two lines are connected on the other side, it's a short-circuit- 
protected transformer.

Ingo