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In Reply to: RE: Where can i get a small 120 to 120 power trans? posted by dave slagle on March 31, 2017 at 07:51:00
by this "If one wants to get creative with either they can simply put the dual secondaries in series with the dual primaries to reduce the overall flux on the core which should be a plus for this application."
assume a 120+120:12+12 transformer.
also assuming 4 discrete windings it can be configured as a 120+12:120+12 which is a 132:132. Since 132:132 is 1:1 it can be used as a 120:120 and placing 120V on a winding that can handle 132V winding will result in a ruduced flux on the core which means less radiated magnetic field. Getting even more industrious you could also use a single 120V winding as the primary and use the other three windings in series for the secondary to get a 120:144 transformer if you need a bit more voltage and then placing 120V across the 144 winding will get you about 100V.
For the flat pack transformers I mentioned each winding is on its own discrete bobbin section so there will be isolation from each section to another and this design also limits the capacitive coupling transmitted between windings. Just as this design would make a really crappy output transformer it does nicely as a limited bandwidth power transformer.
Now, the second thing how easily mounted are any of these ? With the generic open frame trans i only need 2 holes and 2 screws. I really have not used toroids or the other one. Also have you tried using a toroid as you mentioned for a negative voltage source? thanks, Dak
the smaller "flat pack" transformers are PCB mount but they typically also have two holes in the lams that could be used along with standoffs. The toroids just take a single bolt through the center. You sorta need them in hand to come up with a plan but either should be workable.
I use toroids a lot for my phono stuff but am moving toward the flat/pack type design for future experiments.
both mouser and digi-key have them.
Triad Flat Pack
Bel / Signal Flathead
for your application since you are looking for just a voltage source, I would think the smallest ones should suffice.
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