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Audio Circuits:  Level, Tone and Balance Circuits   Page 1
Level Tone Balance:  #-G      H-S      T-Z

Last Updated on: Thursday, October 30, 2014 09:22 AM

 

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

"Tube" circuit provides linear tuning -  11/05/98 EDN-Design Ideas  Parallel LC circuits that you tune by changing capacitance have a nonlinear frequency-versus-voltage or frequency-versus-shaft-position characteristic. The frequency of an analog-tuned circuit is proportional to the reciprocal of the square root of the tuning capacitance. When you tune a bandwidth that is say, 5% or less of the center frequency, the frequency-versus-capacitance....File has many circuits, scroll to this one.... [Design Idea by Lyle Williams, Electronic Technical Services, New Orleans, LA]
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....(electronic design added 6/07)

3 Watt Amplifier -  A 2 Watt audio amplifier made from discrete components. Low distortion Amplifier using discrete components… [Design by Andy Collison]
30 Ddm to +30 Ddm Audio Level Meter -  circuit with balanced input and adjustable gain to drive needle type VU meter, uses special amplifier module from Op-Amp Labs (added 6/06)
300 Watt Subwoofer Power Amplifier -  (electronic circuit added 7/03)
31 Ddm to +30 Ddm Audio Level Meter -  circuit with balanced input and adjustable gain to drive needle type VU meter, uses special amplifier module from Op-Amp Labs (added 6/06)
555 Timer MonoStable Circuit 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.... [Bill Bowden's website]
A Better Volume Control -  A volume control using a linear pot that is much better than most log pots (added 05/06/07)
A Stereo Digital Volume Control based on the CS3310 -  The CS3310 is a complete stereo digital volume control designed specifically for audio systems. It features a 16-bit serial interface that controls two independent, lowdistortion audio channels. The CS3310 includes an array of well-matched resistors and a low noise active output stage....(data sheet added 07/07)
Active Subwoofer & Controller -  (electronic circuit added 7/03)
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/R1C1    The 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.... [Radio Amateur Society of Norwich]
AN011 Jitter Testing Procedures for Compliance with AT&T 62411 -  (app note added 6/07)
AN012 AT&T 62411 Design Considerations Jitter & Synchronization -  (app note added 6/07)
AN016 Jitter Attenuation Performance of the CS61575 & CS61575A -  (app note added 6/07)
AN543: Tone Generation -  Microchip Application Note Published 26-Aug-97  (app note added 2/06)
Audio Graphic Equaliser -  simple 7 band equalizer (added 4/02)
Audio Level Indicator -  Audio Amplifier output relay delay (added 6/06)
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....(schematic design added 01/2010)
Audio level meter VU Meter -  This circuit uses just one IC and a very few number of external components. It displays  audio level in terms of 10 LEDs. The input voltage can vary from 12V to 20V, but suggested voltage is 12V. The LM3915 is a monolithic integrated circuit that senses analog voltage levels and drives ten LEDs providing a logarithmic 3 dB/step analog display. LED current drive....(added 9/06)
Audio Tone Control -  designed by Aaron Cake (circuit added 7/02)
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. The ni....(circuit diagram added 02/09)
Automatic Loudness Control -  Simple add-on module Switchable "Control-flat" option  (added 3/05)
Baxandall Tone Control Circuit -  by Ramon Vargas 8-11-04
Beetle Mk III -  This project is based on our most stable FM transmitter. It has a number of features, with a volume control to adjust the input level and a small, neat box to make it easier to attach to a guitar. The volume control is positioned at the end and when turned up fully, the transmitter provides fuzz (distortion).  (design added 08/08/08)
Better Volume Control -  how to create a log pot that is better than the "real" thing (Electronic Schematic / circuit added 4/02)
Build a simple, soft-action muting switch -  14-Oct-04 Issue of EDN  The circuit in Figure 1 adds a soft muting switch with power-up/power-down muting to a line-level audio circuit. R4, C1, and JFET Q1 quietly ground a signal in 100 to 200 msec when you close S1 or release it when you open S1. Potentiometer R2, set to twice Q1's cutoff voltage, makes the on/off transition times roughly equal.... [Design Idea by John Firestone, Bremerhaven, Germany]
Calibrating the Current Offset Bias (COB) Register for the DS278x Family of Fuel Gauges -  Maxim App Note 4188  -- 3/10/2008  --  (app note add 5/08)
Delay Unit For Surround Sound -  The Mitsubishi M65830 Digital Delay IC has been discontinued (for reasons beyond my comprehension), and so far a suitable replacement device has not been found.  This means (of course) that you will be unable to build this delay circuit. I have left the project in place as reference, and the overall connection schematic is still valid if (when?) a replacement for the M65830 is located. The project will be updated at that time. In the meantime, just ignore the delay circuit.... (schematic / Circuit design added 9/02)
Designing with the LMC835 Digital Controlled Graphic Equalizer -  National Semiconductor Application Note 04-Nov-1995 (app note added 4/02)
Digital Delay Unit For Surround Sound -  The Mitsubishi M65830 Digital Delay IC has been discontinued (for reasons beyond my comprehension), and so far a suitable replacement device has not been found.  This means (of course) that you will be unable to build this delay circuit. I have left the project in place as reference, and the overall connection schematic is still valid if (when?) a replacement for the M65830 is located. The project will be updated at that time. In the meantime, just ignore the delay circuit.... (schematic / Circuit design added 9/02)
Digital 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…(circuit added 6/07)
Digital volume control (Aaron Cake) -  based on DS1669 Digital Pot IC (added 8/03)
Digital volume control has log taper -  11-Apr-02 Issue of EDN  Digital potentiometers provide a compact and convenient way to attenuate audio-amplifier signals. However, most such potentiometers suffer from at least one flaw  a nonlogarithmic step increment. To avoid this problem, a user must usually step the potentiometer in a nonlinear sequence to simulate a logarithmic taper.... [Design Idea by Doug Farrar, Los Altos, CA]
Digital-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 reverse (volume decrease) operation of both channels.….(design added 08/08)
Dual Channel Digital Volume Control -  (electronic Circuit / Schematic added 10/04)
Easy Parametric & Graphic Eq's Plus Peaks & Notches -  (electronic circuit added 8/02)
Expandable Graphic Equaliser -  The project described in this article is a constant Q, fully expandable graphic equaliser.  Where most "conventional" graphic EQ circuits have a Q that is dependent on the setting of the pot, this one maintains the same Q at all settings. This is achieved....(electronic design added 6/07)
Generating Tone using Pdo -  Toshiba 870X Series Application Note  (added 2/06)
Guitar Control -  CaStand-alone, 9V battery powered unit .  Three-level input selector, three-band tone control  (added 3/05)
 
 

Level Tone Balance:  #-G      H-S      T-Z



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