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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:

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. 

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 I’m 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 I’m 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


Power Audio Amplifiers:  #E        FM        N - S        TZ 


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