17 ½ Watt Mono Amplifier – A high quality audio amp that can operate on a low voltage, 12VDC recommended. Uses the Hitachi HA13001 IC and a dozen external components for a compact and powerful monaural amplifier. Builder must supply his choice of speaker (4 or 8 ohm) and some heatsink grease to apply between the IC and the heatsink. Includes PC board and all parts. Build 2 for stereo.