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-   -   How do I wire up this transformer for 110V mains? (http://www.diyaudio.com/forums/chip-amps/166687-how-do-i-wire-up-transformer-110v-mains.html)

454Casull 10th May 2010 11:11 PM

How do I wire up this transformer for 110V mains?
 
http://www.apexjr.com/images/66938_sc7.pdf

What are the third wires for on the primaries?

infinia 10th May 2010 11:43 PM

I think they are just extra connectors (leave them open by insulating them) they are the same color code.
parallel 120V PRI windings ( dots to dots) or BLK to BRN and WHT to BLU etc

If your 110 is really 120 > No load voltages s/b close to 43 VDC
Boderline HV >>> PS let use know if your chip amp does OK with your mains measured.

AndrewT 11th May 2010 11:00 AM

Hi,
use a mains light bulb tester to power up each time you change or add something to a mains powered project.

A wrong wiring of the two primaries can quickly burn out a perfectly good transformer if the fuse does not blow quickly enough.

454Casull 11th May 2010 02:58 PM

nm]


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