madbeanpedals::forum

General => Open Discussion => Topic started by: blearyeyes on January 20, 2015, 07:04:24 AM

Title: Can someone help me understand this transformer?
Post by: blearyeyes on January 20, 2015, 07:04:24 AM
Can someone help me understand this transformer?  :(
It has 5 input wires marked 0v~115v~SCN And 0v~115v

Why 3 wires for the 18v and 2 wires for the 9v secondaries?
The difference between 18v~0v~18v and 0v~9v has me confused.

It's an R type transformer:

Input Voltage:
International universal voltage  0~115V,  0~115V , Shielded wire (5 lines)

output voltage:
AC 18V~0V~18V (0.5A 3 lines)
0~9V (0.3A),   0~9V (0.3A),  0~9V (0.3A), 3 groups (6 lines) 

Output Power:30W

Size:79×68×40(mm)
Title: Re: Can someone help me understand this transformer?
Post by: alanp on January 20, 2015, 07:25:58 AM
Another way of thinking of the 18V-0V-18V outputs is to consider it a 36V winding with a center tap, if that helps.

I could be wrong.
Title: Re: Can someone help me understand this transformer?
Post by: blearyeyes on January 20, 2015, 07:36:08 AM
That's what I thought as well...

So then the two 18v outs would share a ground, be out of phase and not be isolated?

My brain hurts...
Title: Re: Can someone help me understand this transformer?
Post by: alanp on January 20, 2015, 07:38:52 AM
You're not the only one. My first instinct would be to make a +/- 15VDC bipolar psu with it, but for guitar pedals that is only useful for the Infinitphase.