A Car Bass Booster is an audio device, which amplifies the low frequency bass within the audio spectrum. It is a dedicated stereo device, which operates in a similar manner to an audio equaliser.
General-purpose equalisers are often not effective at boosting very low frequencies, and therefore many electronics enthusiasts make their own circuit to achieve this purpose.
This circuit utilises the LM1036N IC, which provides treble, balance, volume, and bass, controls. It also has a “Loudness” switch, which provides an additional boost.
An advantage of this circuit is that you will not need to use dual ganged potentiometers, normally required in other stereo boost circuits. Hence, together with minimal external components, this circuit is simple and cheap for constructors.
As you can see from the circuit diagram, the IC provides a single bias voltage of 5.4 V from pin 17 for the potentiometers. The volume range is 75 dB, tone control at 15 dB, and channel separation at 75 dB.
The circuit has a very high signal to noise ratio of 80 dB making this circuit ideal for high quality sound. If you want that unique clean high-bass sound then this circuit can provide it.
This is the display of the boost response graph, when the capacitors at pin 3 and pin18 are of value 0.01 µF and capacitors at pin 6 and pin 15 of value 0.22 µF.
The blue curve shows the boost gain achieved with the potentiometer control, while the red curve shows the boost gain using the loudness compensation switch.