Accurate Bass Tone Control


Posted on Feb 6, 2014

A difficult problem in the design of conventional stereo tone controls is obtaining synchronous travel of the potentiometers. Even a slight error in synchrony can cause phase and amplitude differences between the two channels. Moreover, linear potentiometers are often used in such controls, and these give rise to unequal performance by human heari


Accurate Bass Tone Control
Click here to download the full size of the above Circuit.

ng. Special potentiometers that counter these difficulties are normally hard to obtain in retail shops. A good alternative is a control based on a rotary switch and a discrete potential divider. The problem with this that for good tone control more than six steps are needed, and switches for this are also not readily available. Fortunately, electronic circuits can remove these difficulties. The analogue selectors used may be driven by mechanical switches, standard logic circuit or a microcontroller. The selectors used in the present circuit are Type SSM2404 versions from Analogue Devices, which switch noiselessly. Each IC contains four selectors, so that a total of eight are used. The step size is 1. 25 dB at 20 Hz with a maximum of 10dB. The circuit can be mirrored with S1, which means that a selection may be made of amplification or attenuation of bass frequencies. The user can choose between attenuation only and extending the range by dividing R9. The control can be bridged by switch S2. To prevent the output impedance of the circuit having too much effect on the operation of the circuit, the output impedance must be ‰¤ 10 . Resistor R1 2 protects the circuit against too small a load. At maximum bass amplification at Ui n = 1 V r. m. s. , the THD+N <0. 001% for a frequency range of 20 Hz to 20kHz and and a bandwidth of 80kHz. The circuit draws a current of about 10 mA.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Simple Peak Detector Circuit schematic with explanation
    Simplest Piezo Driver Circuit Explained
    Solid state voltage indicator with high voltage cutout
    lfr using 555 timer
    sound via light
    Schematic Diagram DCF77 Preamplifier circuit and explanation
    250mW audio amplifier
    AH1751-P HALL EFFECT LATCH
    Analog circuit enforces slow servo response
    Car Battery Charger Circuit
    Transparent Mode XBee Projects for Model Railroading
    A Scriptable Thermometer
    Norton high voltage inverting amplifier



    Top