Using the 7490 counter to make the crossover

High frequency probe high frequency line can be customized other specifications

Photocoupler

The analog crossover is a circuit device in the speaker that separates the input analog audio signal into different parts such as treble, midrange, and bass, and then sends them to the corresponding high, medium, and woofer units for playback. The reason for this is that no single speaker can perfectly reproduce the full frequency of the sound. The frequency divider is to distinguish the sound signals of different frequency bands, respectively give amplification, and then send them to the speakers of the corresponding frequency bands for playback. In high quality sound reproduction, electronic crossover processing is required.
This circuit selection is based on the 7490, which is a binary counter.