Active subwoofer circuit

Active subwoofer circuit

This is the circuit diagram of this active subwoofer.
    This circuit uses a four-op amplifier as the core to form an input buffer, a band-pass filter and an output driver. The input A circuit is
composed of a buffer (gain of 1) ICl-a, Rwang, R, R3, a mixer, and a voltage divider. device composition. The potentiometer is used to adjust the output of
the entire circuit . The op amp ICl-b and C2, C3.R5 and R together form a high-pass filter with 12dB per octave
. The cutoff frequency of this filter is l/2rrRC, which is about 34 ratio. R and R7 determine the gain and Q value of this filter. cl
and center form another high-pass filter with 6cB per octave, and its cut-off frequency is about 20HzoICl-cC4 and island,
island, and Rlo form a low-pass filter with 12dB per octave , and its low-pass cut-off frequency is 72Hz. The gain and
O value of this stage are composed of two filters, R and Rt2 setting ports, to form a band-pass filter. Its frequency range is 34Hz ~ 72Hz.
Signals below 20H are filtered out to prevent the speaker from being heard by human ears. Large vibration at less than the frequency causes overheating damage.