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Audio Circuits:  Power Amplifiers
Audio Circuits -- Main Page

Audio  Power Amplifiers:  #E        FM        N - S        TZ 

Last Updated: June 02, 2021 01:44 PM


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

FM Band Preamplifier -  Here is a high performance RF amplifier for the FM band which can be successfully built without any special test equipment.  The grounded-gate configuration is inherently stable without any neutralization if reasonably good layout techniques are employed.  The output transformer is designed to resonate with the FET's drain capacitance at about 92 MHz giving the amplifier the highest gain at the low end of the band where the weaker stations operate.  No tuning capacitor is needed as long as the transformer is built precisely as described __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Garage Sale Preamps -  At garage sales I find wideband cable-TV amplifiers like this one. They work fine as a preamp for less sensitive FM tuners. The internal power supply with captive line cord is convenient, although it precludes mounting the amplifier outdoors at the antenna. This particular amplifier had 13.7 dB of gain in the FM band and a surprisingly high third-order input intercept (IIP3) of 135 dBf. Saturated output was 136 dBf (40 mW). Return loss was 14.5 dB input and 12 dB output. __ Designed by Brian Beezley K6STI

Guitar Pre Amplifier using TL072 -  The following diagram is the circuit diagram of guitar pre-amplifier.  The circuit built using dual op-amp circuit which is already included in IC TL072

Headphone Amplifier -  In the fall of 2001, I have built one of the Stor designs: a single-ended class A headphone amplifier with only three transistors per channel: one BC109 (voltage amplifier with local negative feedback) and two 2N3055s (modulated current source).  At first, I thought that this circuit could hardly sound good.  However, simulations indicated low THD.  Moreover, the harmonic spectrum was nice: mainly second and relatively few and weak higher-order components.  A tube-like spectrum, in my opinion a good thing ! This encouraged me to give the circuit a try __ Designed by Aren van Waarde

HI FI Preamp -  It has an exceptionally fast high frequency response, as demonstrated by applying an 100kHz squarewave to the input. __ Designed by Graham Maynard

Hi-Fi Preamp -  Another preamp, but this one has tone controls, and all pots are PCB mounted __ Designed by Rod Elliott  ESP

Hi-Fi Preamp -  Designed to bring multichannel operation and microprocessor convenience to the hi-fi while maintaining high audio quality.  This uses the PGA2310 to control the gain of 6 channels and was my first project to use a PIC. __ Designed by Mark Hennessy

High quality audio preamplifier (OPA2134) -  An audiophile quality preamp, with full switching and programmable gain __ Designed by Rod Elliott  ESP

High-Performance Microphone Preamplifier -  Some recording devices, especially computer sound cards, have poor sound quality or insufficient gain when used with certain microphones.  This tiny module provides a line level output from an unbalanced or balanced microphone and has very low noise and distortion.  It runs off 5-20V DC, consuming just 6mA. __ SiliconChip

IC tone control preamplifier using single 741 opamp -  Schematic only, no circuit description

JFET Double Balanced Mike Preamp -  Based on a Design by Graeme Cohen AES Preprint #2106 __ Contact: info @ forsselltech . com

JFET Mike Preamp using Jensen JE16 Input Transformer -  Schematic Only __ Contact: info @ forsselltech . com

LM358 Preamp -  Another very simple audio preamp to build.  all parts should be available at your very local electronics shop. __ Designed by Andy Wilson

Low impedance microphone Amplifier -  The circuit is a microphone amplifier for use with low impedance (~200 ohm) microphones.  It will work with stabilized voltages between 6-30VDC.  If you don't build the impedance adapter part with T1, you get a micamp for higher impedance microphones. __ Designed by Peter Jakab

Low Noise Balanced Microphone Preamp -  A discrete front end makes this balanced microphone preamp very quiet __ Designed by Rod Elliott  ESP

Low Noise Microphone PreAmplifier -  This is a design for a low noise microphone preamplifier, which is ideally suited to low impedance (600 Ohm nominal) microphones.  One limitation is that it is not balanced, which is not a problem in a home recording environment, but will allow the mic lead (and case) to pick up noise with long cable runs or in a hostile environment. __ Designed by Rod Elliott  ESP

Low Noise Stereo Preamplifier based NE5533 -  This is the circuit diagram for low noise stereo preamplifier based on NE5533 operational amplifier.  The circuit uses 2 pieces of NE5533 since there is only 2 op-amp circuits inside NE5533.  This circuit is featured volume level, right/left balancing and loudness level adjustment.  It will be easy to build this circuit since the components used in this circuit is not much and easy to find at electronic store.

Low Voltage Microphone Preamplifier -  This is a low voltage microphone preamplifier circuit with a 1.5V power supply.  The reference, with a 500 kHz unity-gain bandwidth, is used as a preamplifier with a gain of 100.  Its output is fed through a gain-control potentiometer to the op amp, which is connected for a gain of 10.  The combination gives a 60 dB gain with a __ Designed by Popescu Marian

Low voltage microphone preamplifier using LM10 -  Circuit Only

Low Voltage PreAmplifier -  A low voltage preamplifier optimized for 3 Volt operation. __ Designed by Andy Collison

Magentic phono cartridge phono preamp -  Gotta stack of 'old' vinyl LPs sitting around that you'd like to play through your computer sound card or record to your new CDR-W but don't have a stereo pre-amp to do it? Then build this magnetic pre-amp with RIAA curve play back (equalization) .  Make sure to use shielded wire for all your connections as well as a 9 volts battery to eliminate any AC(Hum) noise.  This is a very sensitive amplifier and will output up to 350mv at 1khz for 5mv input from a magnetic cartridge. __ Designed by © Laurier Gendron, Burnaby, B.C., Canada

Masthead Preamp -  I have received several requests for a masthead preamplifier for use in the VHF spectrum.  The power and switching circuitry may be made independant of the frequency so here I have presented two versions of a circuit I used whilst living in England.  My first circuit is a simple preamplifier showing the power arangements for conveying DC to the amplifier via the coaxial cable.  The second circuit is a small modification so the antenna can still be used for transmitting. __ Designed by Harry Lythall-SM0VPO

Medium Wave Active Antenna -  This circuit is designed to amplify the input from a telescopic whip antenna.  The preamplifier is designed to cover the medium waveband from about 550Khz to 1650Khz.  The tuning voltage is supplied via RV2, a 10k potentiometer connected to the 12 Volt power supply __ Designed by David Sayles

Microphone preamp for portable transceivers -  Schematic only, no circuit description __ Designed by Guy Roels ON6MU

Microphone Preamp MC-80 -  Schematic only __ Designed by va3iul

Microphone PreAmplifier -  This is a simple microphone preamplifier circuit which you can use between your microphone and stereo amplifier.  This circuit amplifier microphone suitable for use with normal home stereo amplifier line/CD/aux/tape inputs.  This microphone preamplifier can take both dynamic and electret microphone inputs (preamplifier provides power foe electret microphone elements).  The idea of this circuit is to keep the design as simple as possible __ Designed by Tomi Engdahl

Microphone Preamplifier -  A low noise pre-amplifier suitable for amplifying dynamic microphones with 200 to 600 ohm output impedance. __ Designed by Andy Collison

Microphone Preamplifier with Variable Gain LM358 -  Schematic only __ Designed by va3iul

Mike Preamplifier with Dynamic Compressor -  Schematic only __ Designed by va3iul

Minimalist Discrete Hi-Fi Preamp -  Note that the project described here has been superceeded by the new Revision A version.  The new circuit uses a dual supply, and does not include the power supply.  P05 is ideally suited for this new version.  A preamp designed for the minimalist, and having no frills at all is the design goal for this project.  It is designed as a preamp for the Death of Zen (DoZ) Class-A power amp (Project 36), and has very low levels of noise and distortion, in a minimum component count, fully discrete circuit. __ Designed by Rod Elliott  ESP

Mixer & Preamplifier for String Instruments -  Most of the small musical bands have up to four string instruments like guitars and violins.  The signal from the transducers of these instruments should be buffered and sometimes amplified before __ Electronics Projects for You

Modular Audio Preamplifier -  High Quality, Discrete Components Design.    Input and Tone Control Modules. __ Contact: Flavio Dellepiane, fladello @ tin.it

Modular Phono Preamplifier -  High Quality Moving Magnet Pick-up module; Two-stage Series/Shunt feedback RIAA equalization __ Contact: Flavio Dellepiane, fladello @ tin.it

Modular Preamplifier Control Center -  Volume and Loudness controls; CD and Aux inputs __ Contact: Flavio Dellepiane, fladello @ tin.it

Modular Preamplifier Switching Center -  Four high level inputs; Double Bar switching __ Contact: Flavio Dellepiane, fladello @ tin.it

Modular Preamplifier Tone Control -  Bass and Treble Controls; Traditional or shelving frequency adjustment __ Contact: Flavio Dellepiane, fladello @ tin.it

MOSFET-Based Preamplifier for FM Radio Dxing -  FM transmissions can be received within a range of 40 km.  If you are in fringe areas, you may get a very weak signal.  FM DXing refers to hearing distant stations __ Electronics Projects for You


Power Audio Amplifiers:  #E        FM        N - S        TZ 


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