Circuit to change the output voltage of the secondary double winding of the transformer

This article introduces a circuit that changes the output voltage of the secondary double winding of the transformer. If the two output windings are AC 18V and AC 6V respectively, and now we want to make a DC regulated power supply with a 5V output, obviously the two sets of AC output voltages are very important for the 7805 integrated voltage regulator. The inputs of the two windings are not suitable. In this case, the anti-series method can be used, that is, the same terminals of the windings can be connected. The output voltage after anti-series is AC 12V. If the output voltage of the two windings is both AC 6V, the forward series method can be used. method to boost the voltage, the output voltage after the forward series is AC 12V. It should be noted that whether the forward series method or the reverse series method is used, the output current rating should be based on the group with the smaller original output current rating. .