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Audio Circuits:  Level, Tone and Balance Circuits
Audio Circuits -- Main Page

Automatic Level Tone Balance:  #'s - A      B - H      I - R      S - Z

 

Last Updated: November 30, 2017 07:38 AM




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

1:4 BALUN -  Ham RadioBALUN, TUNERSSchematic __ Designed by Guy Roels ON6MU

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)

1750Hz & 82.5Hz PiLoTtone generator with PIC12 IC -  My Radio amateur callsign is OZ2CPU.  I like to use Atmel AVR Atmega PIC16 PIC16F876 PIC16F84.  Most electronics easy made for the novice and something is for the more experienced. __ Designed by Thomas Scherrer OZ2CPU

2 Watt Amplifier -  A 2 Watt audio amplifier made from discrete components.  This was one of the earliest circuits that I ever designed and built, in Spring 1982.  At that time I had only an analogue meter and a calculator to work with.  Although not perfect, this amplifier does have a wide frequency response, low harmonic distortion about 3%, __ Designed by Andy Collison

2 Watt Amplifier -  An audio amplifier made from discrete components with 2 Watts audio power into an 8 ohm load.  Carlos has used this amplifier on his AM radio for many years. __ Designed by Carlos Feldman

3 Band Equalizer -  Using a single op-amp this easy to make equalizer offers three ranges, low frequency, mid frequency, and high.  With component values shown there is approximately +/-20dB of boost or cut at frequencies of 50Hz, 1kHz and 10kHz.  Supply voltage may be anything from 6 to 30 Volts.  Maximum boost 20dB is only realized with maximum supply voltage __ Designed by Andy Collison

300 Watt Subwoofer Power Amplifier -  There are some important updates to this project, as shown below.  Recent testing has shown that with the new ON Semi transistors it is possible to obtain a lot more power than previously.  The original design was very conservative, and was initially intended to use 2SA1492 and 2SC3856 transistors   (rated at 130W)with 200W   (or 230W) devices, some of the original comments and warnings have been amended to suit. __ Designed by Rod Elliott  ESP

555 Timer MonoStable using Pushbutton The two circuits above illustrate using the 555 timer to close a relay for a predetermined amount of time by pressing a momentary N/O push button.  The circuit on the left can be used for long time periods where the push button can be pressed and released before the end of the timing period.  For shorter periods, a capacitor can be used to isolate the switch __ Designed by Bill Bowden

7 band graphic eqalizer -  Audio graphic equalizers are very common as commercial products (for Hi-fi, car audio and stage use) but circuits for them are very rarely published.  I didn't design this one but it's really very simple.  The details shown are for a 7 band but the principle can be extended to almost any number of bandsif you can find accurate enough components. __ Designed by Richard Torrens

A Better Volume Control -  A volume control using a linear pot that is much better than most log pots __ Designed by Rod Elliott  ESP

A High-Quality DAB+/FM Tuner, Pt.1 -  We know you've been waiting for it and after more than a year in development, we are delighted to present this world-first high performance DAB+/FM stereo tuner design.  It has all the bells and whistles of DAB+ in a sleek pro-quality case, with all features accessible by remote control. __ SiliconChip

A High-Quality DAB+/FM Tuner, Pt.2 -  Last month, we introduced our new DAB+/FM Stereo Tuner and gave the circuit details.  This month, we show you how to assemble the two PC boards and install them into a low-profile steel case. __ SiliconChip

A High-Quality DAB+/FM Tuner, Pt.3 -  In this month's final part, we explain how to use the DAB+/FM Stereo Tuner and describe the menu system.  We also show you how you can upgrade the firmware if necessary and describe various features of the tuner in detail. __ SiliconChip

Accomodating Offset IF Filters -  Digitally synthesized FM tuners normally use ceramic IF filters centered at 10.7 MHz. But the characteristics of individual filters vary. Murata specifies filter center frequency as 10.67 to 10.73 MHz. Outlier filters may make a tuner more susceptible to interference on one side of channel center than the other. __ Designed by Brian Beezley K6STI

Active Subwoofer & Controller -  Designed to operate a sub-woofer driver below its resonant frequency __ Designed by Rod Elliott  ESP

An Inexpensive Tone Encoder -  Figure 1 illustrates an easy circuit that can be constructed with mostly Radio Shack parts on any general purpose circuit board.  The only rigid requirement is that capacitor C1 be stable over a wide temperature range.  Use only Mylar, Polyester or Metal film for capacitor C1.  The frequency is determined by the following formula: FREQUENCY = 1/R1C1The specified values should allow any tone between 100 to 300 Hz.  Increase R1 or add another resistor in series with R1 for lower tone frequencies __ Designed by Radio Amateur Society of Norwich

Audio Graphic Equaliser -  Audio graphic equalizers are very common as commercial products (for Hi-fi, car audio and stage use) but circuits for them are very rarely published.  I didn't design this one but it's really very simple.  The details shown are for a 7 band but the principle can be extended to almost any number of bandsif you can find accurate enough components. __ Designed by Richard Torrens

Audio Level Indicator -  Audio Amplifier output relay delay __ Designed by Tomi Engdahl

Audio Level Meter -  Audio levels can be monitored using a small panel meter with this circuit built from discrete components.  The circuit has a flat frequency response from about 20Hz to well over 50Khz.  Input sensitivity is 100mV for a full scale deflection on a 100uA meter.  Built on two common emitter amplifiers, the first stage has a preset resistor which may be adjusted for a FSD.  The last stage is biased to operate at roughly half the supply voltage for maximum ac voltage swing.  Audio frequencies are passed through the 10u dc blocking capacitor and the full wave bridge rectifier converts the signal to a varying dc voltage __ Designed by Andy Collison

Audio Tone Controls -  Many people at one time or other, regardless of their interest in electronics, have adjusted these controls to suit their preference.  Whether its to boost the bass of their favorite CD, cut the noise / static on a talk radio station or compensate for poor loud speaker response, they've reached for the treble and bass tone controls. 

Automatic Loudness Control -  Simple add-on module Switchable "Control-flat" option __ Contact: Flavio Dellepiane, fladello @ tin.it

AVC Automatic Volume Control -  AVC The featured circuit controls a volume line automatically.  It delivers an output voltage of approximately 4 volts peak to peak.  This voltage remains relatively constant by input voltages ranging from several hundred milivolts to serveral volts.  This electronic circuit is not highly recommended for Hi-Fi __ Designed by Popescu Marian


Automatic Level Tone Balance:  #'s - A      B - H      I - R      S - Z


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