Hairball Audio DIY-990 Opamp

Hairball Audio's DIY-990 is a derivative of the JE-990 discrete operational amplifier. Since being designed by Deane Jensen in 1979 and released into the public domain, the 990's many revisions have found their way into many high-quality audio designs such as the <a href="[wiki-url]jensen-twin-servo-990-mic-preamp/">Jensen Twin Servo</a> and <a href="[wiki-url]hairball-audio-lola-diy-mic-preamp/">Hairball Audio Lola</a> preamps. The kit includes all the parts necessary for completion of a working DOA. [gallery link="file" columns="2" ids="5274,5273"] <strong>Hairball Audio DIY-990 Features:</strong> <ul> <li>Designed to the exact specifications found in Deane Jensen's 1980 JE-990 AES paper</li> <li>Comes with pre-soldered surface-mount transistor and bypass capacitors; through-hole components must be installed by the builder</li> <li>Suited for use with 15/16V power supplies- R10 and R11 may be swapped with 62K resistors for operation with 24V power supplies</li> <li>PCB designed by Mnats, made in the USA</li> </ul> <strong>Price:</strong> <ul> <li>$25 for DIY kit</li> <li>$50 for assembled/tested unit</li> </ul> <strong>More Information:</strong> <ul> <li>Available from <a href="http://hairballaudio.com/shop/product_info.php?cPath=37&amp;products_id=134">Hairball Audio</a></li> <li>View GearSlutz posts by <a href="http://www.gearslutz.com/board/495115-post58.html">John Hardy</a> and <a href="http://www.gearslutz.com/board/505306-post77.html">Steve Hogan</a> detailing the origins and design of the 990</li> </ul>