Tone Control Circui...
 

Tone Control Circuit  

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Douglas Blake
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14/06/2019 11:05 am  

Here is a pretty basic Bass and Treble tone control circuit. This was originally designed using the ua741 op-amp, now updated to use the NE5532.

Tone Controls

The frequency response, with the tone controls centered or on bypass, is about -1db at 20hz and flat to 20khz.  The gain is unity, with the controls centered or on bypass. The controls can affect the usual + or - 12db curves centering on 800hz.

Please note: This is not a production circuit. The original worked just fine but the updates for the new op-amp may require a bit of tinkering to get it just right.

 


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JonnyAudio
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20/06/2019 2:18 pm  

Single rail supply line for tone control was designed in the days before op-amps were made & pnp transisters were not readily available to match npn, so they designed things to Quasi Complementary designs. NE5532/34 are design for split rail design, how much extra noise does the single rail design add when compared to a split rail (modern) design.


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Douglas Blake
(@douglas-blake)
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20/06/2019 5:26 pm  
Posted by: JonnyAudio

NE5532/34 are design for split rail design, how much extra noise does the single rail design add when compared to a split rail (modern) design.

Are you sure about that?  Do you see a ground pin anywhere on that chip?

 


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