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Audio Circuits:  Power Amplifiers
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Audio  Power Amplifiers:  #E        FM        N - S        TZ 

Last Updated: December 25, 2017 01:44 PM


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12AX7 Valve Audio Preamplifier -  And we swore we would never do another valve audio project.  Who was it that said "bottles" were dead? __ SiliconChip

14Watt Audio Amplifier + pre-amp & tone control -  This is the schematic diagram of 14 watt power audio amplifier included the pre-amp circuit and tone control circuit.  I think this is complete audio system, just need an input and output   (speaker)

2 MHz Bandwidth PIN Photodiode Preamp with Dark Current Compensation  -  The EVAL-CN0272-SDPZ board contains the circuit to be evaluated, as described in this note, and the SDP-B controller board is used with the CN0272 Evaluation Software to capture the data from the EVAL-CN0272-SDPZ circuit board.  Equipment Needed The following equipment is needed:, Bullet text, Getting Started Load the evaluation software by placing the CN0272 evaluation software into the CD drive of the PC.  Using My Computer, locate the drive that contains the evaluation software.  Launch the evaluation software and connect the USB cable from the PC to the Mini-USB connector on the SDP-B board. __ Analog Devices from the Lab

2-Channel Guitar Preamplifier, Pt 1 -  Each channel has bass, mid and treble controls and there's an optional digital reverberation unit as well. __ SiliconChip

2-Channel Guitar Preamplifier, Pt 2 -  Add life to your music with this easy-to-build digital reverberation board.  It uses two digital delay chips to give realistic effects. __ SiliconChip

2-channel Guitar Preamplifier, Pt 3 -  Pt.3: Building the preamps and reverb module into a metal rack case __ SiliconChip

2-wire remote sensor preamp -  01/13/14  EDN-Design Ideas Locally condition and amplify a distant sensor using only a two-wire connection for both power and signalThis Design Idea implements a remote sensor preamp   (e.g., for a piezoelectric transducer) which transfers both signal and power over a single wire pair or coax__ Circuit Design by Vladimir Rentyuk

450MHz-800MHz UHF Preamplifier -  This circuit is designed to work at UHF frequencies in the range 450-800MHz.  It has a gain of around 10dB and is suitable for boosting weak TV signals __ Designed by Andy Collison

A 12AX7 Valve Audio Preamplifier -  And we swore we would never do another valve audio project.  Who was it that said "bottles" were dead? __ SiliconChip

Altec 1564A Preamp Power Supply -  Schematic only

Altec 428B Microphone Preamplifier schematic -  Schematic only

An RIAA Preamplifier for Magnetic Cartridges -  Many modern amplifiers lack phono inputs.  This preamplifier solves that problem. __ SiliconChip

Antenna & RF preamp for weather satellites -  All the details for a simple turnstile/reflector antenna plus an RF preamp that mounts up on the mast to really drag on those satellite images. __ SiliconChip

API 321 mic preamp schematic -  Schematic only, no circuit description __ Designed by Alan Garren

Audio Preamplifier -  A 2 stage audio pre-amplifier with very good performance.  This preamplifier has two direct-coupled common emitter stages and uses series-voltage feedback.  The circuit has high input impedance, low output impedance, voltage gain can be set independently and has low noise levels and good signal noise ratio. __ Designed by Andy Collison

Audio Pre-Amplifier -  Circuit Only __ Designed by Tony van Roon  VA3AVR

Audio PreAmplifier (Reconnsworld) -  This is a very easy circuit to buildall parts can be found at the local electronics shopno matter how worthless it (the local shop,) usually is. __ Designed by Andy Wilson

Automatic Charger for Battery Operated Hi-Fi Preamps -  For those who want the cleanest possible DC for sensitive preamps, battery power is ideal.  At last, remembering to turn the charger back on is no longer a problem!  This project is one for the experimenter, but as shown will work extremely well.  The sensing circuit can be made so sensitive that a load of only 2.5mA is enough for the circuit to detect, and disconnect the charger. __ Designed by Rod Elliott  ESP

Balanced Mic Preamp for PCs & MP3 Players -  Want to connect a professional microphone with balanced outputs to the line input of your PC's soundcard or an MP3 player, for high-quality voice recordings? This microphone preamp circuit lets you do just that.  It features a balanced input, has a clipping indicator LED and can be powered from a USB port or from an external DC source. __ SiliconChip

Balanced Microphone Preamp -  As I said in my cheapo digital audio project document, I was going to build a microphone preamp to attach a Behringer ECM8000 measurement microphone to line input of my minidisc deck.  After scanning the web to see if similar projects existed, I basically found three kindsones that used transformers   (ie.  pretty expensive to start with) and some even followed those with tubes and another transformer   (damn expensive). __ Designed by Madis Kaal

Balanced Microphone Preamp  -  Rugged design includes a 3-band equaliser.  It also features balanced and unbalanced outputs, and can drive a stereo or guitar amplifier. __ SiliconChip

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

Band 2 PreAmplifier -  This is a VHF amplifier for the Band 2 Radio Spectrum tuning approximately 88108 Mhz. __ Designed by Andy Collison

Bass/Treble Tone Control-Op Amp -  another bass and treble boost tone control giving better performance using a single op-amp __ Contact: P. Townshend EduTek Ltd

Bride of Zen -  The Bride of Zen   (BOZ), designed by Nelson Pass and described in The Audio Amateur, 1994, is a very simple line-level preamplifier which contains only a single medium-power MOSFET per channel   (see the schematic on this page).  Mr.  Pass has given a very lucid account of the design philosophy.  Building instructions including the lay-out for a printed circuit board can be downloaded from Passlabs.  According to mr.  Pass, the variable resistor P102 should be adjusted in such a way that the voltage drop over resistor R108   (in the absence of an input signal) is 4 Volts.  However, in my own homebuilt BOZ I found this to be incorrect.  The preamp sounded good using a cassette deck or an FM tuner as the signal sources.  However, using a CD player a nasty form of distortion occurred during crescendos. __ Designed by Aren van Waarde

Build a good GaAs FET preamp for 2 meters, 222MHz or 440MHz -  This circuit will work on 2 meters, 220 or 440 Mc.   Some part values are different for the 3 bands, however general layout and construction are similar. __ Designed by Kevin K. Custer  W3KKC

Build this magnetic cartridge preamplifier -  Do you have an old turntable but no RIAA inputs on your preamplifier? If so, you need this preamplifier for playback and for converting them to CD or MP3 format. __ SiliconChip

Carbon Mike Preamp BPF-W6GXN -  Schematic only __ Designed by va3iul

Computer Microphone -  This circuit was submitted by Lazar Pancic from Yugoslavia.  The sound card for a PC generally has a microphone input, speaker output and sometimes line inputs and outputs.  The mic input is designed for dynamic microphones only in impedance range of 200 to 600 ohms.  Lazar has adapted the sound card to use a common electret microphone using this circuit __ Designed by Andy Collison

Condenser Mic Preamplifier -  This is a very simple preamplifier circuit for condenser microphone.  This mic preamplifier also can be used for dynamic microphone.

Dual Mike Preamp power supply Gerber -  Gerber Zip file for project __ Contact: info @ forsselltech . com

Dual Transformerless Class a Discrete Mike Preamp -  Uses JMP-1 Modules __ Contact: info @ forsselltech . com

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

Dynamic Mike Preamplifier for IC-706-W5RK -  Schematic only __ Designed by va3iul

Electret MIC Amplifier -  The Elecraft XG2 is a crystal oscillator with accurate 1 V and 50 V output levels.  It's
ideal for receiver test and alignment.  The 1-V output can be used to measure a receiver's
sensitivity, while the 50-V output is useful for S-meter calibration.  Switch-selected
output frequencies of 3579, 7040, and 14060 kHz provide convenient test signals on 80,
40, and 20 meters; harmonics of these frequencies can be used for measurements on
higher bands __ Designed by Andy Wilson

Electret Mic Booster -  NOTE : Must register on this site __ Designed by Published in Elecktor July/Aug, 2010

Electric Guitar Preamplifier -  This is a circuit for a guitar preamplifier that can capture mechanical vibrations (any standard guitar pickup) and then convert them into an electrical signal.  The signal is then amplified by an audio amplifier. __ Electronics Projects for You

A/au-preamps.htm

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

A/au-preamps.htm

Neumann U67 microphone preamp power supply -  Schematic only

Optical and/or Magnetic Preamplifier-Using Models 350P & 365P  -  No description, just schematicOpAmps Lab Inc is the manufactor ofAmplifiers (Video / Audio / Distribution / Microphone / Equalization / Line / VCA / Power), Switchers (Routing / Assign / Matrix), Mult (Press) (Network-Feed) Boxes, Audio Transformers, Oscillators, Power-Supplies, Custom Sub-Systems. __ Application OpAmps Lab Inc.

Pencil Tube Phono Preamp -  Pencil tubes have always fascinated me.  They were the last thermionic devices to be developed, together with nuvistors, and were built to rigid, military specifications.  In my own circle of relatives and friends, I never encountered a commercial audio product using subminiature valves, but I have always wondered what a preamp with such devices would sound like.  Now I know.  A pencil tube phono preamp has been added to the audio chain in my attic. __ Designed by Aren van Waarde

Phono Preamp Valve -  tube design

Phono Preamps for All -  Various circuits for moving coil and moving magnet pickups __ Designed by Rod Elliott  ESP

Phono RIAA Preamp -  Very high quality moving magnet phono preamp, few circuits will better this one. __ Designed by Rod Elliott  ESP

Portable Microphone Preamplifier -  This circuit is mainly intended to provide common home stereo amplifiers with a microphone input.  The battery supply is a good compromise: in this manner the input circuit is free from mains low frequency hum pick-up and connection to the amplifier is more simple, due to the absence of mains cable and power supply __ Contact: Flavio Dellepiane, fladello @ tin.it

Preamp/ Crossover Muting -  Muting circuit suitable for all line-level applications. __ Designed by Rod Elliott  ESP

Pre-Amplifier -  For those who might wish to 'save' to their computer hard-drive a digital copy of their own vinyl record collection, I have redrawn my 1975 vinyl pre-amplifier circuit.  It remains __ Designed by Graham Maynard

PreAmplifier for Microphone or Guitar Use -  suitable for guitar or microphone use __ Designed by Bob Blick

Preamplifier Power Supply -  Uses External AC Adapter.  Safe and effective, low noise and no hum! (PCB replaced by P05A) __ Designed by Rod Elliott  ESP

RCA BA-1A two-stage preamp schematic -  Schematic

RCA BA-21A preamplifier schematic -  Schematic

RCA BA-31A preamplifier schematic -  Schematic

RF Preamplifier -  Input needs only several mWatts (e.  g.  BF900) -> 300 mWatts OUT.  This schematic is a often used buffer.  It's easy to build, clean and cheap.  When you want even more power, you can replace the 2N2219a by a 2N4427 or 2N3553.  You can lower the output by adding a little resistor (10.47 Ohm 1/2W) in the emitter line of the 2N2219a. 

RIAA Equalized Stereo Phono Preamp -  This riaa Pre-Amp is the perfect solution to getting a signal off of your old turntable and into your mixing board.  Whether you want to grab a couple of loops from a 70s LP record or just archive your record collection you need an riaa compensated pre-amp to do it. __ Designed by John Simonton

Simple Antenna Preamplifier for AM Radios -  AM radios are still used for capturing transmissions from long distances (DX reception).  But AM radios normally require long (10-30m) outdoor antennae.  That is easy if you live in a village __ Electronics Projects for You

Simple Circuit Audio preamplifier -  This is a very easy circuit to buildall parts can be found at the local electronics shopno matter how worthless it (the local shop,) usually is. __ Designed by Andy Wilson

Simple Circuit Balanced Mic Preamp -  This is a "utilitarian" preamp.  Although not intended where lowest noise is needed, it is still quiet enough for most applications, and will almost certainly be all that's needed for adding a microphone input to an amplifier or powered speaker __ Designed by Rod Elliott  ESP

Simple Circuit High Quality Hi-Fi Preamp -  As it says, simple, high quality preamp.  Has all the facilities normally expected __ Designed by Rod Elliott  ESP

Simple Circuit microphone preAmplifier #3 -  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 __ Designed by Tomi Engdahl

Simple Circuit Pre-Amp with One Transistor -  This is a very simple pre-amp circuit which use a transistor as a active component to boost the input signal.  Its simplicity makes this circuit easy to built and inexpensive.  The microphone used in this circuit is electret type which is very sensitive detecting the sound around its. 

Simple Circuit Stereo Electret Microphone PreAmplifier -  The leftmost 10k resistor supplies plug-in-power to the electret, forming part of the FET amplifier in the electret capsule.  This could be anything from 2k to 10k, the higher the better the stereo separation (another mic derives bias from the same rail).  Apparently higher values also lower distortion, and the best bias power circuits involve actually breaking a trace on the electret capsule to allow the use of both a drain & source resistor, but Im not going that far. 

Simple RF Preamp -  I built this RF preamp from junkbox parts. The common-gate circuit provides an input return loss of > 18 dB from 88 to 108 MHz. The corresponding mismatch loss is < 0.07 dB. I could not find a recommended source impedance for lowest noise figure. I went for a good match instead since input mismatch loss directly degrades the noise figure. __ Designed by Brian Beezley K6STI

Simple Transistor Audio PreAmplifier -  This easy circuit provides good gain to week audio signals.    Use it in front of an RF oscillator to make an RF transmitter that is very sensitive to sound. __ Designed by Tony van Roon  VA3AVR

Single IC Audio Preamplifier -  Circuit only, no description is included. __ Designed by Tony van Roon  VA3AVR

Sound Blaster Microphone PreAmplifier -  Dynamic microphones can be connected to SoundBlaster if a suitable microphone preamplifier is built which can amplify the signal levels from dynamic microphones so much that they give enough level for SoundBlaster.  This amplification can be quite easily done using simple single transistor microphone preamplifier circuit __ Designed by Tomi Engdahl

Stereo Electret Microphone PreAmplifier The leftmost 10k resistor supplies plug-in-power to the electret, forming part of the FET amplifier in the electret capsule.  This could be anything from 2k to 10k, the higher the better the stereo separation (another mic derives bias from the same rail).  Apparently higher values also lower distortion, and the best bias power circuits involve actually breaking a trace on the electret capsule to allow the use of both a drain & source resistor, but Im not going that far. 

Stereo Line Driver -  A stereo line driver for feeding long cables or buffering an audio source. __ Designed by Andy Collison

Stereo PreAmplifier -  Simple circuitry suitable for moving-magnet cartridges.  Passive high-frequency equalization __ Contact: Flavio Dellepiane, fladello @ tin.it

Studio Series Stereo Preamplifier -  Designed for the audio perfectionist, this superb preamplifier uses the latest high-performanceop amps for ultra-low noise and distortion __ SiliconChip

Studio Series Stereo Preamplifier -  Installing The Modules In A Case __ SiliconChip

SW RF Pre-Amplifier -  A radio frequency amplifier to boost SW reception.  Frequency range approximately 5 to 20 MHz. __ Designed by Andy Collison

A/au-preamps.htm Page 4

Thermistor Preamp -  (spice design) __ Designed by Rick 

Transistor Audio PreAmplifier -  This easy circuit provides good gain to week audio signals.    Use it in front of an RF oscillator to make an RF transmitter that is very sensitive to sound. __ Designed by Tony van Roon  VA3AVR

Transistor Preamp -  A versatile, High Gain design.  Can be Frequency compensatated for Various applications, including Dynamic Microphones, Tape and Phono Applications.  Shown are Values for a Flat & RIAA response, but many others can be created. __ Designed by G.L. Chemelec

Transistorized Microphone Preamplifier with Band Pass Filter -  Introduction The signal from most of the microphones should be amplified before to be send to the interconnection cables.In order to reduce the noise of the amplifier the bandwidth of the signals __ Electronics Projects for You

Tube Line Driver/Preamp -  Published in Glass Audio #2/1993 __ Contact: info @ forsselltech . com

Tube Microphone Preamp -  This preamp design started out as a conventional three stage cascade with feedback RIAA equalization.  I decided on 6SL7's running into 6SN7's.  I figured it would be a good match (electrically and asthetically) for my 2A3 Amp.  After thinking it through I thought I might just try passive RIAA.  (Even a better matchno feedback!!!) I noticed a neat RIAA preamp circuit in the back of the RCA Tube Manual RC-19 that used a single 7025 per channel __ Designed by Bob Danielak

Two transistor audio preamplifier with volume control -  Circuit Only

Two-wire remote sensor preamp -  01/13/14  EDN-Design Ideas Locally condition and amplify a distant sensor using only a two-wire connection for both power and signalThis Design Idea implements a remote sensor preamp   (e.g., for a piezoelectric transducer) which transfers both signal and power over a single wire pair or coax__ Circuit Design by Vladimir Rentyuk

UHF TV PreAmplifier -  This circuit is designed to work at UHF frequencies in the range 450-800MHz.  It has a gain of around 10dB and is suitable for boosting weak TV signals __ Designed by Andy Collison

UHF-TV Preamplifier -  Circuit only

UHF-TV Preamplifier -  Circuit only

Ultrasonic Preamp with AGC -  The next circuit shows how an ordinary diode can be used as a variable resistance element to incorporate automatic gain control. __ Designed by Richard Torrens

Universal Pre-Amp -  This is the universal pre amplifier circuit diagram that can be used for common input such us microphone, cd player, tape recorder or other electronic circuit which require pre-amp.

Universal Preamp/ Mixer -  A small and versatile mixer and preamp, suitable for many uses __ Designed by Rod Elliott  ESP

Utrasonic Preamp with Twin T Tuning -  The last circuit is an ultrasonic preamp with a twin T feedback to make it highly tuned. __ Designed by Richard Torrens

Vacuum Tube Microphone Preamp/Direct Box Project -  from January1997 EQ Column, includes phantom power supply

Very Good Transistor Preamp -  A versatile, High Gain design.  Can be Frequency compensatated for Various applications, including Dynamic Microphones, Tape and Phono Applications.  Shown are Values for a Flat & RIAA response, but many others can be created. __ Designed by G.L. Chemelec

Vinyl Pre-Amplifier -  This is Vinyl Pre-amplifier circuit.  This circuit will make your audio system have a great audio performance.

Zen Revisited Power Amplifier (SE MOSFET) -  SE power amplifier with just one active device (MOSFET) per channelUsed in the Attic __ Designed by Aren van Waarde

 

Power Audio Amplifiers:  #E        FM        N - S        TZ 


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