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Amplifiers: Audio Circuits
Amplifier -- Main Page          Audio Amplifiers Circuits -- Main Page

Audio Amplifiers:   #'s       A - D        E - M        N - R      S - U     
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Last Updated: October 18, 2017 05:03 AM

Circuits Designed by Dave Johnson, P.E. :
TV /VCR Remote Range Extender Circuit  -  I often get frustrated by how poor some infrared remotes in many new electronic devices operate.  I used to be able to turn on the TV from 30 feet away.  Now, it seems that I have to get within 15 feet.  To address this issue, I designed the circuit shown below.  The circuit taps into the TV remote’s existing infrared LED and drives 8 more efficient devices.  The result is a communications range some 4 to 5 times longer.   . . . Circuit by Dave Johnson P.E.-October 05, 2005

Video Signal Edge Enhancements  -  I designed this circuit many years ago, based on the claims that the technique would improve the quality of standard TV images.  The circuit adds information to the edges of the objects and was reported to bring out more detail.  After building and testing . . . Circuit by David A. Johnson P.E.-July 08, 2000


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


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

Vacuum Tube Opamp Circuit -  Published In Glass Audio #3/1995 __ Contact: info @ forsselltech . com

VamPower 100 Watt PA Amplifier -  The schematics on this page are actually of the VamPower 100 watt PA Head and have been kindly drawn and submitted by Andrew Higgins (many thanks indeed Andrew).  Though they are of the PA Head, the power supply, output stage and splitter are pretty much the same on most of the VamPower amps.  It's only the PA front-end pre-amp that differs. __ Designed by John Chambers

Variable Amplifier Impedance -  Figure 1 shows two amplifiers (shown as opamps) , with (a) being conventional voltage drive, and (b) is current drive.  The output impedances are in the order of zero ohms and infinite ohms in each case (this IS a theoretical discussion at the moment!).  The gain will appear to be exactly the same for each into an 8 ohm resistive load, __ Designed by Rod Elliott  ESP

Variable Amplifier Impedance -  This is a circuit where a microphone and preamp circuit   (voice circuit) have priority over any other audio signal.  You can think of this as a one way intercom, if the main amplifier is used for listening to music, then when the push to talk switch is pressed, the amplifier is switched to the voice signal. __ Designed by Andy Collison

Variable Bandwidth CW Filter -  As the sunspots return and DX propagation conditions to improve, the age old problem with QRM begins to show up on the amateur bands.  Fortunately, help is at hand.  The circuit in figure 1 is a variable bandwidth CW filter using two IC's.  The first IC is a 741 op amp used as an active filter and the second IC is a 386 audio amp IC.  This circuit connects to the headphone or speaker jack of your HF rig __ Designed by Radio Amateur Society of Norwich

Variable notch filter with both high & low pass filters -  A variable notch filter with both high and low pass filters. __ Designed by Andy Collison

Various tube crossovers -  You'll find here few ASCII schematics for Heath and Marantz tube crossovers.  They were given in L'Audiophile No 11 old sery July 1979 __ ?

VCA-Voltage Controlled Amplifier -  fantastic little circuit that can be configured as a vca, modulator and multiplier. __ Contact: P. Townshend EduTek Ltd

Versatile Audio Amplifier (Using the TBA810) -  You can build a versatile audio amplifier for your workbench or for any other of your audio projects.  with the TBA 810 IC (Integrated Circuit).  It can also be cross-referenced to an NTE1115.  You may view the data sheet of the IC HERE.  It has special characteristics that make it quite attractive for the home constructor.  From this IC, you will obtain different ranges of audio power, according with the supply voltages of your power source, as it is shown in the table below

Versatile FET booster engine. Schematic & perfboard/PCB layouts. -  A versatile FET booster engine. __ Contact: holler @ runoffgroove.Com

Version #2 of my active HiFi  speakers -  Featuring new electronics, some new drivers, and lots of musings about audio technology. __ Designed by Manfred Mornhinweg

Vibrato Unit for Guitar -  A reasonably simple circuit, with results similar to the Vox AC30 guitar amp __ Designed by G. Forrest Cook

Video Signal Edge Enhancements -  I designed this circuit many years ago, based on the claims that the technique would improve the quality of standard TV images.  The circuit adds information to the edges of the objects and was reported to bring out more detail.  After building and testing. . . Circuit by David A. Johnson P.E.-July, 2000

Vinyl 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

Visual metronome -  The Metronome is any device that produces a regulated audible and/or visual pulse, usually used to establish a steady beat, or tempo, measured in beats-per-minute (BPM) for the performance of musical compositions.  It is an invaluable practice tool for musicians that goes back hundreds of years 

VLF Whistler Reception -  "Natural Radio" is a fancy name for radio noise with natural origins, mainly lightning.  At first, you might think that listening to lightning crackles is pretty uninteresting but as it turns out, electromagnetic radiation from lightning can travel great distances and undergo strange modifications along the way __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Vocal zapper -  This low cost device can be used with any conventional stereo system to remove the lead vocal from most stereo tapes, CDs or records.  Plug in almost any dynamic microphone and you're ready to put your voice where the lead singer was. __ Designed by John Simonton

Vocal Zapper-How It Works -  All vocal eliminators start with the assumption that the lead vocal in a recording is in the center of the stereo fieldwhich means that it is equal amplitude and phase in both left and right channels.  Subtracting one channel from the other removes this highly correlated signal while leaving the uncorrelated signals in the channels unchanged.  Since kick drum and bass are often recorded at stereo center the time constant of C3 and R12 is chosen so that these signals are blocked from the non-inverting input so they pass to the final output without being zapp __ Designed by John Simonton

Voice Amplifier -  This is a very simple and low cost audio amplifier.  Small modification in this circuit can be done to use along with walkman and intercom etc.

Voice Message Recorder/ Player -  I designed this gadget mainly for use in industrial and perhaps automotive situations, where a warning or alarm condition can trigger a voice message.  This has the advantage that a person doesn't need to look at warning lights etc to instantly know what's happening.  The audio amplifier on the board can drive one or more speakers, and there's also a line level output which can feed a PA system or even a radio transmitter. __ Designed by Bob Barker, not the TV Host

Voice Recorder ISD2560 -  This project is based on ISD2560P IC which allows us to record 60 seconds voice and playback it with very high quality.  As shown in the schematic, we input the voice by using an electret microphone.  If a dynamic microphone is used, R2, R3, R4

Voice Recorder Module -  Here's an improved version of the very popular voice recorder design we published in May 2005.  It can now be set up easily to record two, four or eight different messages for random-access playback or a single message for 'tape mode' playback.  Also, it now provides cleaner and glitch-free line-level audio output suitable for feeding an amplifier or PA system.  It can be powered from any source of 9-14V DC. __ SiliconChip

Voice Scrambler/Descrambler -  This is a single-inversion voice scrambler/descrambler.  Though no longer useful for police scanners, it would be a fun project for a hobbyist.  It was designed for use on a 9-volt battery, but by changing resistor values proportionately, it could be adapte __ Designed by Andrew R. Morris

Voice-Over -  This is a circuit where a microphone and preamp circuit   (voice circuit) have priority over any other audio signal.  You can think of this as a one way intercom, if the main amplifier is used for listening to music, then when the push to talk switch is pressed, the amplifier is switched to the voice signal. __ Designed by Andy Collison

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') __ Designed by Richard Torrens

Voltage Controlled Mixer with Modulator -  Schematic only, no circuit description __ Designed by John Simonton

Voltage Controlled Panner -  pans audio left and right __ Designed by G. Forrest Cook

Voltage Controlled Panner -  This circuit is used to convert a mono audio signal into a stereo signal that can be panned between the left and right channel by a 0-10V control signal, it is intended for analog synthesizer systems.  The circuit is mainly here for historical reasons, a higher quality panner may be built with the National Semiconductor LM13700 dual transconductance amplifier set up as a pair of voltage controlled amplifiers. __ Designed by G. Forrest Cook

Voltage follower with 1G ohm input resistance -  This is a new implementation of the AVR DDS signal generator v2.0, already published in scienceprog.  com.  It is obvious that full credit for the original schematic and the firmware goes to its original creator.  Presented here is a different PCB that is compact, single sided with only through-hole components for easy construction. __ Designed by Vassilis Papanikolaouvpapanik @ gmail.com

Volume Control -  This circuit could be used for replacing your manual volume control in a stereo amplifier.  In this circuit, push-to-on switch S1 controls the forward (volume increase) operation of both channels while a similar switch S2 controls __ Designed by Aaron Cake

Volume Pedal Conversion -  Volume Pedal Conversion for Wah Pedals __ Designed by Guitar Effect RC Keen

VOX (voice operated relay) -  Schematic only __ Designed by va3iul

Vox AC30 Guitar Amplifier Simulator -  This project has been withdrawn at Stephan's request, as he has sold the rights for the AC30 Simulator to a manufacturer.  While its removal is obviously a loss for my site, I wish him well.  Sorry for any inconvenience. __ Designed by Rod Elliott  ESP

Vox AC-30 Top Boost adapted for use as a distortion stompbox -  The Vox AC-30 amp is considered by many to be the defining sound of the British Invasion during the 1960s.  The Top Boost circuitry provided crisp treble-laden overdrive that perfectly complemented the rich bass content.  The English Channel is a JFET-based distortion stompbox that uses the same basic architecture as that classic early '60s amp. __ Contact: holler @ runoffgroove.Com

VU & PPM Audio Metering -  A versatile and useful VU meter circuit, can also operate as a Peak Program Meter __ Designed by Rod Elliott  ESP

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Audio Amplifiers:   #'s       A - D        E - M        N - R      S - U        V _ Z

 


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