This is a stereo amplifier kit designed to make use of the power amplifier IC. Once this kit is completed you have a fully functional, two-channel audio amplifier, complete with a standby switch, volume control and indicator LEDs. The kit also includes a 6400BG heatsink for the STA540 to dissipate any damaging heat. In this kit, the STA540 is configured as a dual bridge amplifier capable of delivering up to 2x 38W (4Ω at 18V). Power supplied to the kit directly powers the STA540 and should be within 8 to 22V. This kit comes as a bag of parts, you'll need to solder everything to the PCB. All components are through-hole, so it shouldn't be too difficult; but this kit is a bit more complex than our other through-hole kits. Project description, more information and ordering can be found at https://www.sparkfun.com/products/9612 STA540 Dual/Quad Power Amplifier: http://www.sparkfun.com/commerce/product_info.php?products_id=9557 6400BG Heatsink: http://www.sparkfun.com/commerce/product_info.php?products_id=9576 LM358 Op Amp: http://www.sparkfun.com/commerce/product_info.php?products_id=9456 LED - Basic Red: http://www.sparkfun.com/commerce/product_info.php?products_id=533 SPDT Mini Power Switch: http://www.sparkfun.com/commerce/product_info.php?products_id=102 Assembly Instructions: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Kits/SFE03-0010-KitCard-AudioAmp-ReadersSpreads_03.pdf