Adding a subwoofer to a color TV

The turning frequency of the low-pass filter is 100Hz, and the attenuation characteristic is
{8d f3/()ct. The operational amplifier uses a NE5534 single operational amplifier, as
shown in Figure 9-25. The subwoofer amplifier circuit adopts Fool
1 produced by Dahua Electronics Factory 7 j. The power under the 30v DC power supply is greater than 30W (8fl), as
shown in Figure 9-26. No external components. So the success rate is high, as a subwoofer
circuit f. The suitable c box should be divided into A. S. W subwoofer, the sound box structure
is shown in Figure (j-27 (unit mm)), equipped with Feile YD10-25 04 type
(10 inches, 80) sacral resonance rubber-rim speakers, and the cabinet is made of 20mm medium
density fiberboard , the inner frog is covered with 3 0mm thick polyester cotton.
    The audio signal can be taken out from the audio output terminal tAUf)l() OLTT) of the color TV, and the subwoofer is
connected to the color TV. Turn it on and listen, the low frequency is rich and full. The intensity is greatly increased, and its effect is comparable to that of imported large-screen color TV sets
.