transformer maximum current

[asdf]

I'm in the need of a power supply and just found two old transformers of
the right voltage in an old box. What I don't know about them is the
maximum continuous current they can source. Not knowing also any data
about the two windings turns count, could I get at least a rough value by
measuring the secondary winding wire diameter? Thanks.

 

[Phil Allison]

"asdf"

I'm in the need of a power supply and just found two old transformers of
the right voltage in an old box. What I don't know about them is the
maximum continuous current they can source. Not knowing also any data
about the two windings turns count, could I get at least a rough value by
measuring the secondary winding wire diameter?

** Just measure the primary resistance - it is a very good guide to the VA
rating of any mains tranny.

For a 230 VAC tranny, 60 ohms = 50VA and 8 ohms = 225 VA.

Once you know the VA, the secondary current rating is simply VA / voltage.



...... Phil

 

[Cydrome Leader]

"asdf"


** Just measure the primary resistance - it is a very good guide to the VA
rating of any mains tranny.

For a 230 VAC tranny, 60 ohms = 50VA and 8 ohms = 225 VA.

where do these numbers come from?