All 2692 schematics are available on a single page here.

Audio power amplifier circuit diagrams / circuit schematics

• LM380 2.5 watt audio amplifier circuit
  
• Stereo audio amplifier based on TDA2822M
  
• 13.5 Watt Power Amplifier using a TL081 opamp and TIP125 / TIP120 power transistors
  
• Quadraphonic Amplifier based on pair of LM1877 devices
  
• DPA 880 amplifier schematic
  
• Class-A/AB Amplifier delivering 100W into a 4 ohm load
  
• 25 Watt MOSFET Audio Amplifier using IRF532 / IRF9532 hexfet transistors for output stage
  
• Easy to build DIY 50W amplifier based on ICL8063
  
• 20 Watt Audio Power Amplifier using TDA2005M
  
• 22 Watt Stereo Amplifier using TDA1554
  
• Two Transistors Audio Amplifier
  
• 10 Watt Audio Amplifier circuit diagram
  
• DPA 220 amplifier schematic
  
• Low impedance microphone amplifier
  
• DPA 440 amplifier schematic
  
• CMoy pocket headphone amplifier
  
• Headphone amplifier based on 12AX7 tubes
  
• 150W audio amplifier that's cheap to build using TIP142 / TIP147 Darlington power transistors
  
• Voice Amplifier
  
• Miniature audio amplifier
  
• 4 channel power amplifier with bi-amping and bridging options
  
• Amplifier based on LM4780 including a thermal shutdown feature
  
• Low Power Audio Amp Experiments
  
• More Discrete BJT, Low Power AF Amp Experiments
  
• Selection of Integrated Circuit Audio Amplifiers
  
• Potpourri of Transistor Audio Amplifier Circuits
  
• Build a good Audio Buffer Amplifier
  
• Speech Amplifier Box
  
• TDA2030 8 Watt amplifier
  
• 2W Audio Amplifier using BD139 and BD140 transistors
  
• 16 Watt audio amplifier using pair of 8 watt LM383 audio amplifier chips
  
• 8 watt amplifier circuit diagram
  
• HeadBanger Headphone Amp
  
• Audio amplifier output relay delay
  
• 100W RMS Amplifier circuit diagram
  
• Circuit diagram for 8 watt audio amp
  
• Headphone monitor amp
  
• Tube amplifier
  
• Spatial Distortion Reduction Headphone Amp
  
• High quality exponential VCA
  
• 50W audio power amplifier circuit diagram
  
• 25W MOSFET audio amplifier
  
• 50W audio amplifier using ICL8063
  
• Amplified ear for surveillance
  
• Five Tube Stereo Amplifier
  
• Mini-MosFet Audio Amplifier
  
• Low power audio amplifier using BC109C along with BD679 and BD680 Darlington pairs
  
• 10 watt audio power amplifier using discrete transistors (includes PCB layout)
  
• 22 Watt Audio Amplifier using TDA1554 two channel audio amp chip
  
• 50 Watt Amplifier circuit diagram
  
• Hammonator Organ to Guitar Amp Conversion (tube amplifier)
  
• Two 9v battery-powered amps based on the LM386. Schematic and PCB/perfboard layouts.
  
• Ruby is an "enhanced" version of the Little Gem battery-powered amplifier (LM386 based design)
  
• 110mW emitter follower audio power amplifier
  
• 30W ultra-low distortion audio power amplifier
  
• Simple Class A Amplifier - 10W audio output
  
• Low power audio amplifier circuit based on LM386
  
• Small audio amplifier based on LM386
  
• Simple 200W audio amplifier
  
• 360W RMS into 8 ohms or 550W RMS into 4 ohm audio power amplifier
  
• Crest Audio LT Series LT100, LT1500 and LT2000 Schematic Set - class D amplifier (PDF)
  
• Variable Amplifier Impedance
  
• Soft-Start Circuit For Power Amps
  
• Simple 0 to 24 dB Gain Amplifier and Balanced Line Driver (PDF)
  
• 20 dB Amplifier and High Current Balanced Line Driver
  
• 12 dB Amplifier and High Current Line Driver with DC Servo (PDF)
  
• Super Simple 3 Watt Audio Power Amplifier based on TDA1015
  
• H-Bridge Power Amp circuit diagram and SPICE simulation files
  
• Basic Audio Amplifier including a SPICE model
  
• 100W audio amplifier including PCB layout
  
• 10-30 watt stereo audio amplifier circuit
  
• 2W / 4W audio amplifier using pair of LA4100, LA4101 or LA4102 modules
  
• 30-Khz Bandwidth High Linearity Opto-Isolated Amplifier