Use of a circuit board for controlling a low voltage motor or a high voltage motor of an air conditioner, wherein the circuit board is provided with a printed wiring board, the printed wiring board comprising: a pattern for a primary circuit for receiving a power supply with a high voltage from a high power source; a pattern for a component mounting circuit, wherein the component mounting circuit includes a low voltage circuit and a common circuit; a pattern for the low voltage circuit for receiving a power supply of a low voltage from a low power source, wherein the low voltage is lower than the high voltage; a pattern for the common circuit; a first insulator that insulates the pattern for the primary circuit from the pattern for the common circuit; and a second insulator that insulates the pattern for the common circuit from the pattern for the low voltage circuit, the use of the circuit board comprises: using the low voltage circuit in a case where a low voltage component used on the low voltage and a power supply terminal block for receiving the power supply of the low voltage are provided, and using the common circuit when either one of the low voltage component and a high voltage component used for the high voltage is provided, wherein in a case where the high voltage component is provided on the common circuit, a first jumper of the circuit board is used to connect the pattern for the primary circuit to the pattern for the common circuit while a second jumper of the circuit board to connect the pattern for the common circuit to the pattern for the low voltage circuit is not used; wherein in a case where the low voltage component and the power supply terminal block for receiving the power supply of the low voltage are provided on the low voltage circuit, a second jumper of the circuit board is used to connect the pattern for the common circuit to the pattern for the low voltage circuit, while the first jumper is not used; wherein the high voltage component is a terminal block for connecting to a high voltage motor used on the high voltage, and the low voltage component is a connector for connecting to a low voltage motor used on the low voltage. a pattern for a primary circuit for receiving a power supply with a high voltage from a high power source; a pattern for a component mounting circuit, wherein the component mounting circuit includes a low voltage circuit and a common circuit; a pattern for the low voltage circuit for receiving a power supply of a low voltage from a low power source, wherein the low voltage is lower than the high voltage; a pattern for the common circuit; a first insulator that insulates the pattern for the primary circuit from the pattern for the common circuit; and a second insulator that insulates the pattern for the common circuit from the pattern for the low voltage circuit, the use of the circuit board comprises: using the low voltage circuit in a case where a low voltage component used on the low voltage and a power supply terminal block for receiving the power supply of the low voltage are provided, and using the common circuit when either one of the low voltage component and a high voltage component used for the high voltage is provided, wherein in a case where the high voltage component is provided on the common circuit, a first jumper of the circuit board is used to connect the pattern for the primary circuit to the pattern for the common circuit while a second jumper of the circuit board to connect the pattern for the common circuit to the pattern for the low voltage circuit is not used; wherein in a case where the low voltage component and the power supply terminal block for receiving the power supply of the low voltage are provided on the low voltage circuit, a second jumper of the circuit board is used to connect the pattern for the common circuit to the pattern for the low voltage circuit, while the first jumper is not used; wherein the high voltage component is a terminal block for connecting to a high voltage motor used on the high voltage, and the low voltage component is a connector for connecting to a low voltage motor used on the low voltage.