This simple tone control can be used in may audio applications. It can
be added to amplifers, used as a stand alone control module, or even
built into new and exciting instruments. It’s one IC construction makes
it a very compact circuit, as only a few support components are
required. Plus, it does not use a dual power supply. This means that the
circuit will run from 9V to 15V (although the bass will be a little
weak at 9V). The circuit is by Robert Barg and originally appeared in
the Think Tank column of the May 1998 issue of Popular Electronics.
|C1, C3, C5, C7, C15, C16||6||2.2uf Electrolytic Capacitor|
|C2, C6||2||0.05uF Ceramic Disc Capacitor|
|C4||1||0.22uF Disc Capacitor|
|C8, C10||2||0.015uF Ceramic Disc Capacitor|
|C9||1||100uF Electrolytic Capacitor|
|C11, C12, C13, C14||4||0.1uF Ceramic Disc Capacitor|
|R1, R4||2||10K 1/4W Resistor|
|R2, R5||2||33K 1/4W Resistor|
|R3, R6||2||4.7K 1/4W Resistor|
|R7||1||2.2K 1/4W Resistor|
|R8, R9, R10, R11||4||50K Linear Pot|
|U1||1||TDA1524A Tone Control IC|
|J1, J2, J3, J4||4||RCA Jacks||Other connectors of your choice|
|MISC||1||Board, Wire, Knobs, 18 Pin Socket|
- S1 is a contour control. Volume is controlled by R11. Balance
is controlled by R10. R9 and R8 control bass and treble, respectivly.
- J1 is the left input, J4 is the right input. J2 is the left output, J3 is the right output.
- The circuit is designed to accept line level or mic level
inputs. if you are going to be using a stronger signal, a voltage
divider will be necessary to cut it down to proper levels.
- You can, of course, skip J1-J4 if you plan to integrate this circuit into another.