Audio Amplifiers

Car Amplifiers:

1. Large capacitor charge "controllers" (Car Audio)
2. Switch-mode Power Supply for a Tube Car Amplifier
3. Inside Story: Audison LR604XR amplifier (Car Audio)

Power Amplifiers:

1. The DPA 220 schematic
2. The DPA 440 schematic
3. The DPA 880 schematic
4. Two Transistors Audio Amplifier
5. 10 Watt Audio Amplifier
6. 20 Watt Power Amplifier
7. 22 Watt Stereo Amplifier
8. 25 Watt MosFet Audio Amplifier
9. 50 Watt Amplifier
10. 55W (Originally 75W) Power Amplifier
11. 300W Subwoofer Power Amplifier
12. Updated 60-100W Hi-Fi Power Amplifier
13. 22 Watt Audio Amplifier
14. 18 Watt Audio Amplifier
15. 10 Watt Mini Audio Amplifier
16. Amplifier 2x30W with STK465
17. Mini-box 2W Amplifier
18. Motorola Hi-Fi power amplifier
19. 60W Bass Amplifier
20. 100W Audio Amplifier
21. 2 Watt Audio Amplifier
22. 8 Watt Amplifier
23. Quadraphonic Amplifier
24. 15 Watt Amplifier
25. Class-A//AB Amplifier 100W 4ohm

Tube Amplifiers:

1. Stereo Tube Amplifier
2. Kitchen DHT 28.11.2004. IT-coupled 6C45P-6B4G PP amplifier. Fixed bias on both stages
3. Mamont I - transformerless tube power amplifier (based on Atma-Sphere M60)
4. Single-ended driver for a Circlotron OTL
5. Baby of Camel: All-directly-Heated Pushpull Amp - Spy Photos
6. Klauskorrektor I: First phono stage
7. Klauskorrektor II
8. Tube opamps: Photos of an antique analogue computer unit (Soviet, naturally!)

Other Amplifiers:

1. Guitar Amplifier
2. 60W Guitar Amplifier
3. Portable Headphone Amplifier
4. Low impedance microphone amplifier
5. Low pass filter - Subwoofer
6. Portable Mixer
7. Phono Preamplifier
8. 3 Line Mixer
9. FET Audio Mixer
10. Audio Line Driver
11. The Big-E Stereo Parabolic Microphone
12. Stereo Audio Isolator
13. Guitar Reverb Effect Version 2
14. Guitar Reverb Pedal
15. Headphone Amplifier
16. Voice-Over Circuit

Miscellaneous:

1. Audio Indicator
2. Voltage Controlled Panner
3. Panner Waveform Generator
4. Audio VU Meter
5. Audio Level Meter
6. The Audio / Video Distribution Amplifier
7. VU Stereo Meter
8. Stereo Mixer
9. Personal Stereo Amplifier
10. Underwater microphone

Articles:

1. Klausmobile Tube Tester
2. Battery heaters in a tube amplifier: A simple battery switch with undervoltage protection
3. Inside Story: Audio Refinement Complete integrated amplifier
4. Tip: Breadboarding chassis idea
5. AN12: Monitoring AC heater currents in tube amplifier
6. AN13: Delay timers, Power-on sequencing using TL431 in comparator mode
7. MTX250 Car Amplifier: Autoformer Switch-Mode Power Supply