mixer - Headphone amplifier for guitar with stereo MP3 input - mixing - Electrical Engineering Stack Exchange
Electric Guitar Amplifier + Preamplifier – Electronics Projects Circuits
Build a Great Sounding Audio Amplifier (with Bass Boost) from the LM386
ElectroSmash - 1Wamp Electroc Guitar Amplifier.
Deluxe Micro
Reading Schematics
Amazon.com: LyxPro Electric Guitar Amp 20 Watt Amplifier Built In Speaker Headphone Jack And Aux Input Includes Gain Bass Treble Volume And Grind - Black : Musical Instruments