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Amplifier Schematics - Power Circuits

1.5 W Power Amplifier type class-C - This project will explain the basic function of a class-C transmitter. I will explain how to dimension a transmitter and the purpose of the different components. I will also explain how you can build a 1.5W PA transmitter. The project will include PCB, components.

1.5kW Power Amplifier - Just the thing for those for whom no amount of power is enough

10 Watt Power Amplifier - Simple Class A Amplifiers

100W Audio Amplifier - This is an exceptionally well designed amplifier, with a lot of power reserve, high fidelity, low distortion, good S/N ratio, high sensitivity, low consumption and full protection

100W Guitar Amplifier Mk II - The original of the unit above. Retained for posterity, and has speaker box details

100W RMS Amplifier - This is a 100 watt basic power amp that was designed to be (relatively) easy to build at a reasonable cost. It has better performance (read: musical quality) than  standard STK module amps that are used in practically every mass market stereo receiver manufactured today. When I originally built this thing, it was because I needed a 100 WPC amp and..

12 Watt Valve Guitar Amp

2.8 GHz prescaler keeps cost down - EDN-Design Ideas

20 Watt Class a Power Amplifier

20 Watt GaAs-FET Power on 2.3 GHz

20 Watt Power Amplifier - The LM1875 is a monolithic power amplifier offering very low distortion and high quality performance for consumer audio applications..

20 Watt Power Amplifier (Randy Linscott) - This IC chip was designed specifically for use in power boosting applications in automobiles. It is self protecting against short circuits and thermal problems. In the bridge configuration shown it will deliver 20 watts of power into a 2 ohm speaker operating at 14.4 volts.

20 Watt/Channel Stereo Power Amplifier - Based on the versatile LM1875 from National Semiconductor

2304 & 3456 MHz Power Amplifiers

27MHz toy car Transmitter

30 Watt Power Amplifier - Ultra-Low distortion30-Watt Power Amplifier

300 Watt Subwoofer Power Amplifier

4 In/1 Out Summing Power Amplifier

45W HEXFET Power Amplifier  - An ideal solution to make a good, low cost power amplifier…

4W Amplifier - I have recently included a page about AF amplifers for use with Homebrew rigs. In this I mentioned that I may include a practical one-watt circuit, complete with PCB foil and layout. Here it is, but I have taken the liberty of engineering it to provide 4-watts of AF output and with a frequency response almost suitable for Hi-Fi applications..

55 Watt Originally 75W Power Amplifier

60 Watt into 8 Ohms Power Amplifier - A simple amp to build, uses commonly available parts and is stable and reliable

60 Watt Power Amplifier

60-100W Hi-Fi Power Amp - 100W into 4 or 8 ohms.  Has excellent performance, and is easy to build.

60W Class-A Power Amp - circuit is on last page.  There is one amplifier configuration that is universally accepted as the ideal for audio use: Class A operation. Many early amplifiers operated in Class A

65W HEXFET Power Amplifier  - A medium power amplifier that is characterized by a lot of good sound quality, but simultaneously is very simple in the construction. Him uses, enough time in my active loudspeakers. In his output stage exist the very good FET transistors, technology HEXFET

A High-Efficiency 400 Watt 13.56 MHz RF Power Amplifier - Application Note Microsemi formerly Advanced Power APT9501

A Simple Capacitance Multiplier Power Supply For Class-A Amplifiers - A basic circuit is provided in the article, but it is assumed that the builder knows all the pitfalls. The supplied schematic is in fact for a capacitance multiplier filter (not a regulator), but is somewhat lacking (I feel) and can be improved dramatically..

Ampli MOSFET - DIY high power MOSFET amplifier200 Wrms 8 ohms -350 Wrms4 ohms

AN-211: The Alexander Current-Feedback Audio Power Amplifier - AN-211 Analog Devices Application Notes

AN-36 LX5506M High Gain, High Efficiency Power Amplifier Also see LX5506 & LX5506B - Application Note Microsemi 1701

AN-60-009  High IP3, wide band, balanced linear power Amplifier HELA-10 - Application Note MiniCircuits.com

AN-60-033  Enhanced Linearity in the HELA-10 Power Amplifier - Application Note MiniCircuits.com

AN-673: 2-Way Multiplexed LCD Drive & Low Cost A/D-Converter using V/F Techniques with COP8 MicroControllers - National Semiconductor Application Note

AN794: Power Considerations for the TC4864 Audio Power Amplifier - Microchip Application Note Published 18-Jul-01

AN808: Using the TC1142 for Biasing a GaAs Power Amplifier - Microchip Application Note Published 12-Nov-02

Apex-AN19 Stability for Power Amplifiers - 11/2004, AN19UREVC : 1369 Kb (Apex App Note added 08/08/08)

Apex-AN20 Bridge Mode Operation of Power Amplifiers - 11/2004, AN20UREVD : 288 Kb

Apex-AN21 Single Supply Operation of Power Amplifiers - 1/1998, AN21UREVB : 372 Kb

Apex-AN28 Proper Analog Wiring of Power Amplifiers - 2/1998, AN28UREVB : 126 Kb

Bridge Mode Operation of Power Amplifiers Apex-AN20 - Apex App Note

Capacitance Multiplier Power Supply for Class-A Amplifiers - Extremely low ripple supply with less power dissipation than a regulator

Current Feedback Amp - The amplifier shown here was previously incorrectly referred to as 'El-Cheapo'. Thanks to a reader who had a copy of the original 1964 article, it was immediately obvious that my recollection was flawed in the extreme…

Dancing lights (Seiichi Inoue) - started this project with the idea to build a simple single-ended tube amplifier. I didn't have any experience with the construction of tube amps so I was looking for a beginner's project. Such a project should be simple (for easy debugging) and it should

Dual Phantom Power Pre-Amp
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