Lib="Amplifier_Operational" part="LM2904"> Dual Operational Amplifiers, DIP-14/SOIC-14 Low-Power, Dual Operational Amplifiers, DIP-14/SOIC-14"/> Audio Jack, 2 x 6mm drills Triple banana socket, footprint - 2 5mm LEDs -Consider: 1 simple on/off switch/button/knob/etc. PSU \+12V, -12V and ground needed, probably up to the * Neither the name of Google Inc. MIT License (MIT) Copyright (c) Ivan Nikolić Permission is hereby granted, free of charge, to any person obtaining a copy Copyright (c) 2006-2010 Kirill Simonov Copyright (c) 2019 Lunny Xiao Permission is hereby granted, free of charge, to any person obtaining a copy of The MIT License Copyright (c) 2013 Google. All rights reserved. Redistribution and use in source and binary forms, with or without The MIT License) Copyright (c) 2014 The Gogs Authors Permission is hereby granted, free of charge, to any person obtaining a copy of https://www.apache.org/licenses/ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 0. This License represents the complete agreement concerning the subject matter hereof. If any provision of this License, Derivative Works shall not apply to liability for death or personal injury resulting from real TL0x4, probably