Head unit and liquid ejection apparatus

A liquid ejection apparatus comprising:

• an ejection unit which includes a piezoelectric element driven by a drive signal, and which is configured to eject a liquid due to drive of the piezoelectric element;
• a drive signal output circuit to which a first DC voltage signal having a first voltage value, a second DC voltage signal having a second voltage value, and an ejection control signal are input, and which is configured to output the drive signal;
• and
• a control circuit configured to output the ejection control signal, wherein
• the drive signal output circuit includes
• a first switch circuit configured to switch whether to supply the first DC voltage signal to the ejection unit,
• a second switch circuit configured to switch whether to supply the second DC voltage signal to the ejection unit, and
• a selection control circuit configured to control the first switch circuit and the second switch circuit based on the ejection control signal, and
• the first switch circuit includes a first switch element one end of which is supplied with the first DC voltage signal, and another end of which is electrically coupled to the ejection unit, and a second switch element one end of which is supplied with the first DC voltage signal, and another end of which is electrically coupled to the ejection unit.