Tone Control

Tone Control

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..

 

Schematic


 

Parts:


 

Part

Total Qty.

Description

Substitutions

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   S1 1 SPST Switch   J1, J2, J3, J4 4 RCA Jacks Other connectors of your choice MISC 1 Board, Wire, Knobs, 18 Pin Socket  

 

Notes:

1. S1 is a contour control. Volume is controlled by R11. Balance is controlled by R10. R9 and R8 control bass and treble, respectivly.

2. J1 is the left input, J4 is the right input. J2 is the left output, J3 is the right output.

3. 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.

4. You can, of course, skip J1-J4 if you plan to integrate this circuit into another.






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