Thanks much, there was other items that appeared on MPJA E-mail advertising that were too good to be true that were on my moderate priority shopping list. This transformer came along for the ride as a spare for our HVAC system that is much more detailed than the typical. Unless someone has an earth shaking comment, thanks for the help, thread closed. :) :) Derward Myrick wrote: > Carl, I have used 1000s of these and center red goes to center black for > 220 > V and use the other red and black as input. Black to black and red to > red and this is the 120 input. I have found these to be very good > transformers, > I have been using these for several years. > > Derward Myrick > > > > ----- Original Message ----- > From: "Carl Denk" > To: "Microcontroller discussion list - Public." > Sent: Monday, July 13, 2009 6:12 PM > Subject: Re: [EE] Transformer wiring help > > > >> I don't have a variac. It is clear on the input side, that the windings >> are in a straight line, just like a center tap, but broken at the >> center. Both windings have black to the left side, and red at the right >> handed side. That makes the outers a black and red, with the center also >> a black and red. For 220 it seems clear that I connect to outer red and >> blacks to the power hot and neutral, and the center red and black to >> each other. For 110, it seems that black and black, and red and red to >> the power hot and neutral. This would go with the common way of doing >> things. >> >> Thanks for the thoughts. If I blow it, no big thing, it was cheap, came >> along for the ride with some things I needed. :) >> >> Olin Lathrop wrote: >> >>> Carl Denk wrote: >>> >>> >>>> I got this transformer rated: *Input:* 110/220VAC 60Hz *Outputs:* >>>> 24VAC @ 2A (12V-0V-12V) and I'm nut sure how to hook it up. >>>> >>>> >>> With 110V in you put the two primaries in parallel, with 220V you put >>> them >>> in series. In either case be very sure to get the polarities right, else >>> poof. You could try to bring it up slowly from a variac output to make >>> sure. >>> >>> >>> ******************************************************************** >>> Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products >>> (978) 742-9014. Gold level PIC consultants since 2000. >>> >>> >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> >> > > > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist