Tone ControlCircuit

  
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P1_47K Log. Potentiometer (See Notes) P2, P3_47K Linear Potentiometers R1, R3, R5_4K7 1/4W Resistors R2_22K 1/4W Resistor R4_1M 1/4W Resistor R6_1K8 1/4W Resistor R7_560R 1/4W Resistor C1, C4, C5, C7_10 µF 63V Electrolytic Capacitors (See Notes) C2_47nF 63V Polyester Capacitor C3_1nF 63V Polyester Capacitor (See Notes) C6_220 µF 35V Electrolytic Capacit
Tone ControlCircuit - schematic

or Q1_BC550 45V 100mA NPN Low noise High gain NPN Transistor A Bass and Treble frequency control to be added to the 3 - 5W Class-A Amplifier was required by some audio enthusiasts. Therefore, this circuit has been designed keeping in mind the extreme simplicity of the amplifier circuit to which it should be linked and was carried out using as few as components possible. Q1 is the only active component forming a straightforward single-stage transistor amplifier with the tone control network in the ac feedback path. Taking this feedback from the split load of Q1 we obtain an ac stage gain of about 3: this can be useful to cope with low output voltage audio sources.



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