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How do I adjust the output voltages on my prototype transformer?
We have found that most design engineers are not aware of the subtle nuances they receive with their toroidal transformer. By soldering on a (heavy) insulated wire to a secondary and adding turns on top of the Mylar Insulation, you can increase the voltage of the prototype. Conversely, you can decrease the voltage of the transformer by reversing the direction of the turns. This allows you to perform very simple fine-tuning of your prototype without having to order a completely new one.

Step 1: Determine which winding you want to adjust the output voltage on.

Step 2: Splice/Solder on additional wire to one of the leads of that winding.

Step 3: Put the lead(s) through the center hole and bring it back to the original point. If the direction of the winding is in the same direction of original winding, it adds one turn on the transformer. If the winding direction is opposite to the direction of original winding, you subtract one turn. To add on or take off more turns, just repeat the process more times.

Step 4: It is important to measure the voltage after the first turn so you can see how much voltage you are adding or subtracting from your lead. Measuring your voltage after the first turn will also give you a better idea of exactly how many turns you will need to reach your desired voltage.

Here are some guidelines for how many turns you may need for 60Hz transformers: