Diagram for Reference

Simple Tone Control specifically designed for the 3 - 5 Watt Class-A audio amplifiers. Traditional Bass, Treble Controls and DC 24V power supply. 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.

Simple Tone Control Circuit Diagram

Parts

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_____10µF 63V Electrolytic Capacitors (See Notes)
C2______________47nF 63V Polyester Capacitor
C3_______________1nF 63V Polyester Capacitor (See Notes)
C6_____________220µF 35V Electrolytic Capacitor
Q1____________BC550 45V 100mA NPN Low noise High gain NPN Transistor

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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