Capacitive load drive circuit and liquid ejection apparatus

A liquid ejection apparatus comprising:

• an ejection head that ejects a liquid by driving of a capacitive load;
• and
• a capacitive load drive circuit that outputs a drive signal for driving the capacitive load, wherein
• the capacitive load drive circuit includes
• a base drive signal output circuit to which a digital signal is input and which outputs a base drive signal,
• an amplification circuit that amplifies the base drive signal and outputs the drive signal for driving the capacitive load,
• a wiring substrate that has a first substrate surface and a second substrate surface located to face each other, and is provided with the base drive signal output circuit and the amplification circuit, and
• a first heat dissipation member and a second heat dissipation member that promote heat dissipation of the amplification circuit,
• the amplification circuit outputs the drive signal by driving of a first transistor and a second transistor,
• the first transistor has a first surface and a second surface located to face each other,
• the second transistor has a third surface and a fourth surface located to face each other,
• a heat dissipation property of the first heat dissipation member is higher than a heat dissipation property of the second heat dissipation member,
• the first surface and the third surface are thermally coupled to the first heat dissipation member,
• the second surface and the fourth surface are thermally coupled to the first substrate surface, and
• the second substrate surface is thermally coupled to the second heat dissipation member.