Audio Circuits - Power Amplifiers S-Z

Audio Circuits: Power Amplifiers Page 5
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Audio Power Amplifiers: # A-G H-O P-R S-Z
Last Updated on: Monday, October 03, 2011 06:07 PM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

SCMS killer circuit - This circuit was invented by Dr. Horst Ludwig from Germany and published in September 1992 in "Stereoplay", a German Hifi magazine. It's an additional board that should work with all DAT decks that have a Sony CXD2601 signal processor IC inside (many Sony DAT-decks and the Pioneer D500). It was tested by Dr. Horst Ludwig.... (Circuit design added 7/06)

Simple Amplifier - (electronic circuit added 7/03)

Simple AV Audio/Video Wireless Transmitter - (electronic circuit added 4/05)

Simple Current Feedback Power Amplifier - 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 …. (circuit added 9/04)

Simple One IC Stage Mic Preamp - AS017 Jenson Transformer Application Note (app note 7/02)

Single Chip 50 Watt/8 Ohm Power Amplifier - Uses National Semiconductor LM3876 Power IC. Voltage gain is 27dB. Voltage gain is 27dB as shown, but this can be changed by using a different value resistor for the feedback path (R3, currently 22k, between pins 3 and 9).... (added 10/05)

Single Chip 50 Watt/8 Ohm Power Amplifier sound.ad - Uses LM3876 HiFi amplifier IC from National Semiconductor (added 4/02)

Single Ended Class A2 Sv81110 Stereo Amp - (diagram added 6/03)

Single Stage Low-Noise IC Mic Preamp - AS018 Jenson Transformer Application Note (app note 6/07)

Single Stage Mic Preamp with Two DC Servos - AS019 Jenson Transformer Application Note (app note 6/07)

Small Amplifier Circuit - Uses many amplifier ICs, from feWatt-Watts to200-Watt (added 4/02)

Small audio amplifiers - Making small, inexpensive, simple 1-Watt audio amplifiers that produce high quality sound. [Manfred Mornhinweg]

Small bench Amplifier ideal for testing audio stages in circuits - (electronic circuit added 2/07)

Soft Start Circuit for Power Amps - Designed for (large) toroidal transformers, limit the inrush current to a sensible value. (diagram added 6/03)

Soft Switching Amplifier with Tone Controls - Built around an LM380, this amplifier includes tone controls and electronic "soft switching". The soft switching circuitry ensures power is built up gradually eliminating the dc thump….(schematic / Circuit design added 9/02)

Spatial Distortion Reduction Headphone Amp - (diagram added 6/03)

Speaker Microphone Circuit - This circuit takes an ordinary loudspeaker and allows it to be used in reverse, as a microphone…. [Andy Collison]

Stereo jack adds no-cost power/logic control - 04/15/99 Issue of EDN Many battery-powered devices use peripherals that require only two conductors to complete their interfaces. You can use stereo phone jacks and monaural plugs to perform power- or logic-control functions in addition to completing their required I/O connections. Monaural plugs short-circuit the ring and sleeve of stereo jacks. You can place the ring connector, normally considered a redundant ground return, into....Page includes several designs. Scroll to find this one.... [Design Idea by Gary O’Neil, IBM Microelectronics, Research Triangle Park, NC]

Stereo Line Driver - Power Amp Stereo Line Driver,This preamplifier has a low output impedance, and is designed to drive long cables, allowing you to listen to a remote music source without having to buy expensive screened cables. The very low output… (added 4/02)

Stereo Tube Amplifier (Aaron Cake) - The circuit is simple, yet is capable of excellent performance. I designed it specifically for use as an amplifier for the digital sound card in my computer. Audio input can be from any two-channel line level device such as a television, CD player....(circuit added 7/02)

Stereo-amplifier IC's outputs drive multiple loads 11/21/05 EDN-Design Ideas Reference provides constant bias voltage regardless of supply-voltage variations. [Design Idea by Jean-Jacques Avenel, Maxim Integrated Products, Lesigny, France]

Stereovahvistin 2 x 220W RMS - This is a building plan for an audio amplifier with2 x220-Watt output power. Text is in Finnish. (added 4/02)

Subwoofer Equaliser - 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....(added 7/03)

Synchronous oscillator converts audio video to FM - 07/22/99 EDN-Design Ideas The synchronous oscillator (SO) and the coherent phase-locked synchronous oscillator (CPSO) are universal multifunctional networks that track, synchronize, and amplify as much as 80 dB; improve SNR by as much as 70 dB; and modulate AM, FM, and FSK signals.... [Design Idea by Vasil Uzunoglu, Synchtrack, Gaithersburg, MD]

TDA2030 8 Watt Amplifier - Although the TDA2030 can deliver 20 watts of output power, I deliberately reduced the output power to about 8 watts to supply 10 watt speakers. Input sensitivity is 200mV. Higher input levels naturally will give greater output, but no distortion should be heard.... (schematic added 6/07) [Andy Collison]

Thermofan to Keep Your Amp Cool - (diagram added 6/03)

Thermostat for 1KW Space Heater SCR controlled - Here is a simple thermostat circuit that can be used to control a relay and supply power to a small space heater through the relay contacts. The relay contacts should be rated above the current requirements for the heater. Temperature changes are detected by a (1.7K @ 70F) thermistor....(added 10/05)

Three Transistor Audio Amp 50 Milliwatt - Here is a little audio amplifier similar to what you might find in a small transistor radio. (added 4/02)

Touch Switch - A touch switch is a switch that is turned on and off by touching a wire contact, instead of flicking a lever like a regular switch. Touch switches have no mechanical parts to wear out, so they last a lot longer than regular switches. Touch switches can be used in places where regular switches would not last, such as wet or very dusty areas.... [Aaron Cake's design]

TPA3001d1EVM Evaluation Module - The TPA3001D1 is a 20-W mono Class-D audio power amplifier designed for 12V to 18V applications with a 4to 8-Ohm minimum speaker impedance. The efficient Class-D operation reduces solution size and cost by eliminating the need for heat sinks. In addition, integrated gain settings and surface mount packaging also....(added 3/05)

TPA3007d1 Evaluation Module - The TPA3001D1 is a 20-W mono Class-D audio power amplifier designed for 12V to 18V applications with a 4to 8-Ohm minimum speaker impedance. The efficient Class-D operation reduces solution size and cost by eliminating the need for heat sinks.... (added 3/05)

Tube Amplifier Kit - The amplifier kit uses two 11MS8 tubes per channel. The two DC blocking capacitors and the four coupling capacitors are metallized polyester, while Samsung aluminum electrolytic capacitors are used to filter the solid-state power supply. ….(design added 11/08)

Tube Amplifiers - (schematic / Circuit design added 9/02)

Tube Microphone Preamp Generic Input Stage - AS020 Jenson Transformer Application Note (app note 6/07)

Two JT-115K-E used in Symmetrical Mic Input Stage - AS047 Jenson Transformer Application Note (app note 6/07)

Two Watt Amplifier - Low distortion amplifier using discrete components (added 5/02)

Voltage Controlled Amplifier - In truth this, like many (most) VCAs is really a current controlled amplifier but there is really not too much difference since if you want to turn a CCA into a VCA you simply feed the current input from a voltage via a voltage to current converter (a.k.a. 'resistor')....(electronic circuit added 7/03)

Weighting Filter for Audio Measurements - For noise measurements. Ideal for use with the AC Millivoltmeter above (circuit / schematic design added 6/06)

Audio Power Amplifiers: # A-G H-O P-R S-Z