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Amplifiers - Audio Circuits / Schematics

1 Watt 2.3 GHz RF Amplifier Using a MRF2001:

1 Watt 2.45 GHz Linear Amplifier:

10 Watt Power Amplifier: Simple Class A Amplifiers

100 Watt Amp Circuit:

100 Watt Guitar Amplifier #2:

100 Watt Guitar Amplifier Mk2:

100 Watt RMS Amplifier: This is a100-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 the 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 a100 WPC amp and didnt want to spend any money. So I designed around parts I had in the shop.

15 Watt Amplifier:

16 Watt Amplifier:

2 Watt Amplifier 2: Low distortion amplifier using discrete components

2 Wire Remote Microphone Amplifier: uses special amplifier module from Op-Amp Labs

2.3 GHz Power Amplifiers:

20 Watt GaAaFET Power on 2.3 GHz:

200 Watt Amplifier:

22 Watt Audio Amplifier: Simple stereo amplifier based on TDA1554

2304 and 3456 MHz Power Amplifiers:

3 Band Equalizer:

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

300 Watt Subwoofer Power Amplifier:

50 Watt 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 :

8 Watt Amplifier:

8 Watt Audio Amp Based on LM383:

80 Watt Amplifier #2: Uses the LM12 chip

Active Subwoofer & Controller:

Audio Amp Output Power Limiter:

Audio Amplifier Circuits:

Audio Amplifier Output Relay Delay:

Audio Compressor: A circuit for a single-channel audio compressor using a JFET to control the gain of a virtual earth amplifier.

Balanced Low Noise Microphone Preamp: very low noise, close to the theoretical minimum, high hum rejection and variable gain with a single rotary pot, similar to that used in many professional grade mixing desks

BiDirectional 2.4 GHz One Watt Amplifier:

BiDirectional 900Mhz One Watt Amplifier:

Binaural MICs:

Boundary Layer Dish Microphone: ideas for a directional microphone assembly.

Computer Microphone: adapting electret microphone to soundcards with dynamic microphone inputs

Condenser Microphone hookup:

Crest Audio LT Series LT100, LT1500 & LT2000 Schematic Set: A commercial Class D Amplifier, complete schematics in PDF format.

Death of Zen (DoZ)  a New ClassPower Amp:

Dual JT MB C Microphone Combining Circuit: connect two microphones to1-microph1-input

Dynamic Microphone Amplifier:

Dynamic Microphone to Electret Microphone Input:

ECM Mic Preamplifier:

el Cheapo a Really Simple Power Amplifier:

Electret Microphone Connection: how to connect electret microphone

Electret Microphone Powering:

HeadBanger Headphone Amp:

Headphone Amplifier #1:

Headphone Monitor Amp:

Hi Fi Class D Audio Power Amplifier: The purpose of this site is to share a pulse-width modulating Class D audio power amplifier design with the world, in order to involve people that have an interest in this kind of technology. This is in effect an "open source project", i.e. the design is open and free, and those that have the interest and ability, are encouraged to feed back into the project.

HiFi Headphone Amplifier:

Interfacing Microphones to Computer Sound Cards:

Leach Amp 120 Watt Power Amplifier: Latest update of the "Low Tim Amplifier", Claimed to be a very good sounding design

Leach SuperAmp: 270-Watt Double Barreled Amplifier published in Audio magazine

Lidström Improved ZEN I Class a FET Amplifier:

line Level Signal to Microphone Input Adapter:

Low Noise Balanced Microphone Preamp: very low noise, close to the theoretical minimum, high hum rejection and variable gain with a single rotary pot, similar to that used in many professional grade mixing desks

Low Power Audio Amplifier Based on LM386:

Making a Rugged, Connectorized Microphone From a Panasonic Microphone Capsule:

Micro Spy With FETs:

Micro Spy With TTL:

Micro Spy With USW:

Microphone Mixer: Designed for3-dynamic microphones

Microphone Polarity Tester:

Microphone Preamp: Very simple two transistor circuit

MIDI Passthrough Circuit:

Mike Pads & Other Small Gadgets: Includes Active Direct Box circuit

Modification of Panasonic Backelectret Capacitor Microphone (WM GOAT DigiKey P9967 ND): This drawing describes the conventional hookup and option where FET is connected as source follower with3 wires to preamp.

MOSFET Power Amp: DIY high power MOSFET amplifier200 Wrms 8 ohms -350 Wrms4 ohms

Octave Screamer:

One Watt 2.3 GHz RF Amplifier Using a MRF2001:

One Watt 2.45 GHz Linear Amplifier:

One Watt Class C Amplifier:

Parametric & Subwoofer Equalizer:

Power Amp Schematic:

Quadraphonic Amplifier: This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card.

Quick & Dirty Audio Amplifiers: For those of you who like to experiment with audio and would like a "quick and dirty" amplifier that frees you from having to figure out the biasing resistors, this article has two for you and they run off 9 Volts too!.1-uses an Op-Amp and the other used a transistor.

Radio Shack Pressure Zone Microphone (PZM) Modifications:

SCMS killer Circuit:

Single Chip 50 Watt / 8 Ohm Power Amplifier: Uses LM3876 Hi-Fi amplifier IC from National Semiconductor

SoftStart Circuit for Power Amps:

Sony C 37Condenser Microphone: information with circuit diagram

Spatial Distortion Reduction Headphone Amp:

Subwoofer Equaliser:

Subwoofer Equalizer: The Linkwitz transform circuit is a hugely flexible way to equalize the bottom end of a sealed loudspeaker enclosure. A speaker that is corrected using this method is flat from below resonance to the upper limit of the selected driver. The low frequency roll off point is determined by the parameters of the transform circuit. Should the enclosure size be too small and cause a lump in the response before roll off, this is also corrected. A conventional active crossover network is then used to divide the subwoofer signal from the main channel signals. Note that there is also a separate spreadsheet calculator available for calculating component values for different situations not handled by the original circuit.

TDA2030 8 Watt Amplifier:

Theory & Construction of Mic "Splitters":

ThermoFan To Keep Your Amp Cool:

Three Band Equalizer:

Tube Amplifier: The unit is powered directly from the 120 volt AC line, with no power transformers. Filaments are wired in series, with the total adding up to 117 volts (35 + 35 + 35 + 12). The 35W4 forms a half-wave rectifier, which is filtered by a three-stage RC network. The B+ for the output stage plates and screens are taken from the second capacitor, and the B+ for the preamp and phase inverter from the third capacitor in the filter.  

Two Watt Amplifier: Low distortion amplifier using discrete components

Two Wire Remote Microphone Amplifier: uses special amplifier module from Op-Amp Labs

Vacuum Tube Microphone Preamp : from January1997 EQ Column, includes phantom power supply

Variable Amplifier Impedance: idea of being able to vary the output impedance of a power amplifier

Voice Over Circuit: Switches automatically from sound source to microph1-when enough sound comes in from microphone.

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