Baxandall Tone Control Circuit
This active Baxandall tone and bass control circuit has 12 dB boost and cut for frequencies less than 50 Hz, and greater than 15 kHz. It operates on a single rail supply; however, the non-inverting input requires biasing at ½ Vcc using a potential divider network. For the operational amplifier IC you could use the cheaply available NJM4558.
Component List
| Qty | Type | Value |
| 3 | Resistor | 10 kΩ |
| 1 | Resistor | 3.3 kΩ |
| 2 | Resistor | 2 × 56 kΩ |
| 2 | Potentiometer | 50 kΩ |
| 2 | Capacitor | 33 nF |
| 2 | Capacitor | 3.3 nF |
| 2 | Electrolytic Cap | 1 µF |
| 1 | IC | NJM4558 |
This circuit will also require a 1 MΩ resistor in parallel with 39 pF capacitor connected between the output pin and the inverting input of the operational op-amp.