I already have a transformer 2x 6V outputs. I was wondering can I these in series to produce 12V? Similar to how you would wire two 1.5v batteries to produce 3V.
Yes, transformers with this configuration are designed to be used in this way if required.
- You can wire the secondary coils in series to get twice the voltage.
- You can wire the secondary coils in parallel to get twice the current.
- You can use each secondary independently to get two power supplies.
If wired in series, you will get double the voltage but the VA will be equivalent to only one of the transformers. If wired in parallel, you will get the same voltage as just using one, but you will double your VA. You MUST use transformers of the same VA and turns ratio.
The answers to these questions are not as straightforward as the responses suggest. Connecting transformers in parallel can be dangerous if the output voltage of each is not very close to the same. Transformers exist that are made for the purpose. Even a difference of 1V between the two can cause big problems. The voltage difference causes circulating currents that will quickly overheat windings and, either rapidly or over time, break down the insulation between windings and short them out.
Because transformers are often used with currents and voltages that can be hazardous to life, an investigation of the specific considerations applicable to the application is much safer than experimentation.