Bass and Treble Control using BC148

In this active bass and treble circuit, only one BC148 transistor per channel is required, and as you can see, the Baxandall type network is within the feedback loop. The range of control extends from -22 dB to +19.5 dB at 30 Hz, and -19 dB to 19.5 dB at 20 kHz. When the variable resistors are in the central position, the gain is 0.91. The input and output impedances are 40 kΩ and 180 Ω respectively.

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