Does anyone have any knowledge or experience with what happens if you try to run two different power supply transformers from the same AC line input. Can you do that? I have one transformer with a primary DC resistance of 28 ohms. I have a second transformer with a primary DC resistance of 265 ohms. I want to run these two transformers from the same AC power cord input. I tried connecting their primaries in series across the AC cord input, and the resulting secondary outputs from both transformers were lower than expected for a no-load condition. I am a little concerned about trying to connect the two transformer primaries in parallel.Any ideas?
Transformers don't work with DC inputs. Transformer physics require an input that changes with respect to time. That's why they work with AC. When you apply a DC input to a transformer, it looks basically like a low resistance, depending on the size and mass of the wiring. In order to provide DC as an input to this thing you have, you need a circuit to chop the DC and turn it into AC before it is input to the transformer.
Transformers are connected with their primaries in parallel quite often. However don't connect the secondaries in parallel. For instance a step down 120 to 6.3 volt transformer can be used to power the filaments of a vacuum tubes in an amplifier while a stepup 120 to 350 volt transformer is used to provide the operating voltage for the tubes. Both transformers would use the same input voltage and would run off the same ac line. In practice both the step up and step down transformers end up being combined into one transformer.
Connecting two or more transformer primaries in parallel is no different from plugging two or more electronic devices into the same outlet or power bar. Just be sure you understand what you are going to connect to the secondaries and how to construct your circuit properly.
I do not see any problem in having them parallel,provided the input power is sufficient.
you can connect as many in parallel as you want, if they are all rated at 120 volts AC input. After all, all of the appliances, lights, etc in your house are all connected in parallel, and many of these have transformers. That is what parallel connection is. They all get the same voltage, and they are all independent of each other. .
