There are 68 circuit schematics available. Last circuit added on Tuesday, 19 May 2015.

CircuitCategoryDate AddedOK?
16 Watt audio amplifier using pair of 8 watt LM383 audio amplifier chipsAmplifiersJan 26, 2001
8 watt amplifier circuit diagramAmplifiersJan 26, 2001
DPA 220 amplifier schematicAmplifiers 
Low impedance microphone amplifierAmplifiers 
DPA 440 amplifier schematicAmplifiers 
100W audio amplifier including PCB layoutAmplifiersApr 14, 2011
Quadraphonic Amplifier based on pair of LM1877 devicesAmplifiers 
DPA 880 amplifier schematicAmplifiers 
Class-A/AB Amplifier delivering 100W into a 4 ohm loadAmplifiers 
25 Watt MOSFET Audio Amplifier using IRF532 / IRF9532 hexfet transistors for output stageAmplifiers 
Easy to build DIY 50W amplifier based on ICL8063Amplifiers 
20 Watt Audio Power Amplifier using TDA2005MAmplifiers 
22 Watt Stereo Amplifier using TDA1554Amplifiers 
Two Transistors Audio AmplifierAmplifiers 
10 Watt Audio Amplifier circuit diagramAmplifiers 
150W audio amplifier that's cheap to build using TIP142 / TIP147 Darlington power transistorsAmplifiers 
25W MOSFET audio amplifierAmplifiersFeb 21, 2005
50W audio amplifier using ICL8063AmplifiersFeb 21, 2005
Amplified ear for surveillanceAmplifiersFeb 21, 2005
LM380 2.5 watt audio amplifier circuitAmplifiers 
Stereo audio amplifier based on TDA2822MAmplifiers 
13.5 Watt Power Amplifier using a TL081 opamp and TIP125 / TIP120 power transistorsAmplifiers 
10-30 watt stereo audio amplifier circuitAmplifiersJul 03, 2011
2W / 4W audio amplifier using pair of LA4100, LA4101 or LA4102 modulesAmplifiersMay 25, 2012
Simple Class A Amplifier - 10W audio outputAmplifiersJan 22, 2010
Headphone amplifier based on 12AX7 tubesAmplifiers 
30W ultra-low distortion audio power amplifierAmplifiersJan 22, 2010
Circuit diagram for 8 watt audio ampAmplifiersJan 26, 2001
22 Watt Audio Amplifier using TDA1554 two channel audio amp chipAmplifiersSep 01, 2009
50 Watt Amplifier circuit diagramAmplifiersSep 01, 2009
Crest Audio LT Series LT100, LT1500 and LT2000 Schematic Set - class D amplifier (PDF)AmplifiersMar 17, 2010
Super Simple 3 Watt Audio Power Amplifier based on TDA1015AmplifiersNov 13, 2010
110mW emitter follower audio power amplifierAmplifiersJan 22, 2010
Headphone monitor ampAmplifiersJun 08, 2002
50W audio power amplifier circuit diagramAmplifiersJun 20, 2004
Low Power Audio Amp ExperimentsAmplifiers 
More Discrete BJT, Low Power AF Amp ExperimentsAmplifiers 
Low power audio amplifier using BC109C along with BD679 and BD680 Darlington pairsAmplifiers 
10 watt audio power amplifier using discrete transistors (includes PCB layout)Amplifiers 
Hammonator Organ to Guitar Amp Conversion (tube amplifier)AmplifiersSep 07, 2009
TDA2030 8 Watt amplifierAmplifiersJan 26, 2001
30-Khz Bandwidth High Linearity Opto-Isolated AmplifierAmplifiersJan 08, 2014
Small audio amplifier based on LM386AmplifiersJan 31, 2010
Soft-Start Circuit For Power AmpsAmplifiersMar 30, 2010
Variable Amplifier ImpedanceAmplifiersMar 30, 2010
CMoy pocket headphone amplifierAmplifiers 
360W RMS into 8 ohms or 550W RMS into 4 ohm audio power amplifierAmplifiersMar 17, 2010
Speech Amplifier BoxAmplifiers 
Mini-MosFet Audio AmplifierAmplifiersMar 05, 2009
Low power audio amplifier circuit based on LM386AmplifiersJan 29, 2010
Tube amplifierAmplifiersAug 14, 2002
H-Bridge Power Amp circuit diagram and SPICE simulation filesAmplifiersJan 17, 2011
Basic Audio Amplifier including a SPICE modelAmplifiersApr 11, 2011
100W RMS Amplifier circuit diagramAmplifiersJan 26, 2001
Voice AmplifierAmplifiers 
Miniature audio amplifierAmplifiers 
Audio amplifier output relay delayAmplifiersJan 26, 2001
Spatial Distortion Reduction Headphone AmpAmplifiersJan 31, 2003
4 channel power amplifier with bi-amping and bridging optionsAmplifiers 
Amplifier based on LM4780 including a thermal shutdown featureAmplifiers 
HeadBanger Headphone AmpAmplifiersJan 26, 2001
High quality exponential VCAAmplifiersApr 17, 2004
Selection of Integrated Circuit Audio AmplifiersAmplifiers 
Potpourri of Transistor Audio Amplifier CircuitsAmplifiers 
Two 9v battery-powered amps based on the LM386. Schematic and PCB/perfboard layouts.Amplifiers 
Ruby is an "enhanced" version of the Little Gem battery-powered amplifier (LM386 based design)AmplifiersSep 30, 2009
Five Tube Stereo AmplifierAmplifiersSep 13, 2006
2W Audio Amplifier using BD139 and BD140 transistorsAmplifiersJan 26, 2001