There are 85 circuit schematics available in this category. Click here for all circuit diagrams. The Last circuit was added on Sunday, 24 July 2016.Please note some adblockers will suppress the schematics as well as the advertisement so please disable if the schematic list is empty.

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CircuitCategoryDate AddedOK?Votes 
LM380 2.5 watt audio amplifier circuitAmplifiers Status11 vote up vote down
Stereo audio amplifier based on TDA2822MAmplifiers Status-4 vote up vote down
13.5 Watt Power Amplifier using a TL081 opamp and TIP125 / TIP120 power transistorsAmplifiers Status-4 vote up vote down
Single supply op-amp audio amplifierAmplifiersJun 24, 2015Status1 vote up vote down
DPA 220 amplifier schematicAmplifiers Status-1 vote up vote down
Low impedance microphone amplifierAmplifiers Status-1 vote up vote down
DPA 440 amplifier schematicAmplifiers Status1 vote up vote down
100W audio amplifier including PCB layoutAmplifiersApr 14, 2011Status-3 vote up vote down
Quadraphonic Amplifier based on pair of LM1877 devicesAmplifiers Status2 vote up vote down
DPA 880 amplifier schematicAmplifiers Status-2 vote up vote down
Class-A/AB Amplifier delivering 100W into a 4 ohm loadAmplifiers Status0 vote up vote down
25 Watt MOSFET Audio Amplifier using IRF532 / IRF9532 hexfet transistors for output stageAmplifiers Status0 vote up vote down
Easy to build DIY 50W amplifier based on ICL8063Amplifiers Status2 vote up vote down
Audio VU Meter based on pair of LM324 quad opampsAmplifiers Status-1 vote up vote down
20 Watt Audio Power Amplifier using TDA2005MAmplifiers Status-2 vote up vote down
22 Watt Stereo Amplifier using TDA1554Amplifiers Status0 vote up vote down
Two Transistors Audio AmplifierAmplifiers Status3 vote up vote down
10 Watt Audio Amplifier circuit diagramAmplifiers Status-1 vote up vote down
30-Khz Bandwidth High Linearity Opto-Isolated AmplifierAmplifiersJan 08, 2014Status1 vote up vote down
Compact 3W BTL Audio Power Amplifier TDA7056AmplifiersOct 03, 2013Status0 vote up vote down
Sound alarm based on LM741 opamp and LM386 amplifierAmplifiersFeb 09, 2010Status0 vote up vote down
Small audio amplifier based on LM386AmplifiersJan 31, 2010Status-1 vote up vote down
Super mixer with microphone input / amplifier including a PCB layoutAmplifiersFeb 20, 2010Status1 vote up vote down
10-30 watt stereo audio amplifier circuitAmplifiersJul 03, 2011Status2 vote up vote down
2W / 4W audio amplifier using pair of LA4100, LA4101 or LA4102 modulesAmplifiersMay 25, 2012Status0 vote up vote down
Simple Class A Amplifier - 10W audio outputAmplifiersJan 22, 2010Status-1 vote up vote down
Bridging Adapter For Audio Power AmplifiersAmplifiersJan 29, 2010Status-2 vote up vote down
Power Amplifier Clipping Indicator Circuit DiagramAmplifiersJan 29, 2010Status-3 vote up vote down
Soft-Start Circuit For Power AmpsAmplifiersMar 30, 2010Status1 vote up vote down
Variable Amplifier ImpedanceAmplifiersMar 30, 2010Status0 vote up vote down
CMoy pocket headphone amplifierAmplifiers Status0 vote up vote down
Regulatable audio amplifier using a 741opampAmplifiers Status0 vote up vote down
Bass EQ pre-amp correction for high impedance ceramic crystal pickupAmplifiers Status-1 vote up vote down
12 watt audio amplifier with tone using TDA1020Amplifiers Status0 vote up vote down
5 watt audio amplifier using TDA1010Amplifiers Status0 vote up vote down
1 Watt audio amp using a TDA7052Amplifiers Status1 vote up vote down
Headphone amplifier based on 12AX7 tubesAmplifiers Status0 vote up vote down
Six-channel Mixer and AmplifierAmplifiersJan 31, 2003Status1 vote up vote down
Voltage controlled amplifierAmplifiersAug 12, 2001Status3 vote up vote down
30W ultra-low distortion audio power amplifierAmplifiersJan 22, 2010Status-2 vote up vote down
Circuit diagram for 8 watt audio ampAmplifiersJan 26, 2001Status1 vote up vote down
22 Watt Audio Amplifier using TDA1554 two channel audio amp chipAmplifiersSep 01, 2009Status1 vote up vote down
50 Watt Amplifier circuit diagramAmplifiersSep 01, 2009Status0 vote up vote down
150W audio amplifier that's cheap to build using TIP142 / TIP147 Darlington power transistorsAmplifiers Status-2 vote up vote down
Tube amplifierAmplifiersAug 14, 2002Status-1 vote up vote down
H-Bridge Power Amp circuit diagram and SPICE simulation filesAmplifiersJan 17, 2011Status-4 vote up vote down
Basic Audio Amplifier including a SPICE modelAmplifiersApr 11, 2011Status-1 vote up vote down
100W RMS Amplifier circuit diagramAmplifiersJan 26, 2001Status-3 vote up vote down
Super Simple 3 Watt Audio Power Amplifier based on TDA1015AmplifiersNov 13, 2010Status-2 vote up vote down
Voice AmplifierAmplifiers Status0 vote up vote down
25W MOSFET audio amplifierAmplifiersFeb 21, 2005Status2 vote up vote down
50W audio amplifier using ICL8063AmplifiersFeb 21, 2005Status-1 vote up vote down
Amplified ear for surveillanceAmplifiersFeb 21, 2005Status0 vote up vote down
Miniature audio amplifierAmplifiers Status0 vote up vote down
Audio amplifier output relay delayAmplifiersJan 26, 2001Status-1 vote up vote down
Use amplifier phono input as line level inputAmplifiersJan 26, 2001Status-1 vote up vote down
DC Fault Protection Circuit for Audio AmplifiersAmplifiersJan 29, 2010Status0 vote up vote down
110mW emitter follower audio power amplifierAmplifiersJan 22, 2010Status0 vote up vote down
NE555 drives a speakes: Pulse Width Modulation AmplifierAmplifiersMar 30, 2010Status0 vote up vote down
Spatial Distortion Reduction Headphone AmpAmplifiersJan 31, 2003Status0 vote up vote down
Actvie speaker based on a dual op-amp (LM833) and TDA2030 power ampAmplifiers Status-3 vote up vote down
4 channel power amplifier with bi-amping and bridging optionsAmplifiers Status1 vote up vote down
Amplifier based on LM4780 including a thermal shutdown featureAmplifiers Status1 vote up vote down
HeadBanger Headphone AmpAmplifiersJan 26, 2001Status-1 vote up vote down
Headphone monitor ampAmplifiersJun 08, 2002Status0 vote up vote down
50W audio power amplifier circuit diagramAmplifiersJun 20, 2004Status1 vote up vote down
High quality exponential VCAAmplifiersApr 17, 2004Status-1 vote up vote down
Selection of Integrated Circuit Audio AmplifiersAmplifiers Status-1 vote up vote down
Potpourri of Transistor Audio Amplifier CircuitsAmplifiers Status0 vote up vote down
16 Watt audio amplifier using pair of 8 watt LM383 audio amplifier chipsAmplifiersJan 26, 2001Status0 vote up vote down
8 watt amplifier circuit diagramAmplifiersJan 26, 2001Status0 vote up vote down
Magnetic cartridge amplifierAmplifiersJan 26, 2001Status1 vote up vote down
Speech Amplifier BoxAmplifiers Status0 vote up vote down
Mini-MosFet Audio AmplifierAmplifiersMar 05, 2009Status-2 vote up vote down
Low power audio amplifier circuit based on LM386AmplifiersJan 29, 2010Status-1 vote up vote down
Two 9v battery-powered amps based on the LM386. Schematic and PCB/perfboard layouts.Amplifiers Status-1 vote up vote down
Ruby is an "enhanced" version of the Little Gem battery-powered amplifier (LM386 based design)AmplifiersSep 30, 2009Status-1 vote up vote down
Low power audio amplifier using BC109C along with BD679 and BD680 Darlington pairsAmplifiers Status-1 vote up vote down
10 watt audio power amplifier using discrete transistors (includes PCB layout)Amplifiers Status1 vote up vote down
Hammonator Organ to Guitar Amp Conversion (tube amplifier)AmplifiersSep 07, 2009Status-1 vote up vote down
Five Tube Stereo AmplifierAmplifiersSep 13, 2006Status0 vote up vote down
2W Audio Amplifier using BD139 and BD140 transistorsAmplifiersJan 26, 2001Status-1 vote up vote down
Peak reading audio level meter using CA3140 opampAmplifiersJan 26, 2001Status1 vote up vote down
TDA2030 8 Watt amplifierAmplifiersJan 26, 2001Status-2 vote up vote down
Collection of eight audio amplifier circuit diagramsAmplifiersJul 05, 2015Status-4 vote up vote down