High quality stereo HI-FI combo amplifier 01

(1) The following pictures of the head amplifier
    are all two-channel three-dimensional structures, and only one of the channels is shown. The reason why NE5532 has the reputation of the king of op amps
. Thanks to its low noise and high slew rate. Considering that many audiophiles who are new to the audio industry still use tapes as signal sources. More
importantly, tapes are rich in content, updated quickly, and are cheap. Therefore, it makes sense to make a head amplifier. The head amplifier made of NE5532 is the same
as that of ordinary radio cassette players. (Compared with the A3161.TA7668 head amplifier, you can find
the excellence of NEsS32. After replacing the ordinary head amplifier alone, you can find that the amplifier is quiet when there is no signal. When the sound sounds,
it is like throwing a ball into a calm pond. A few stones can greatly improve the clarity of speech and music; the bass is rich and thick, the treble is slender and pleasant
, and has the effect of high-end sound. The detailed circuit is shown in Figure 5-77. In addition, it is best to pay attention when using this head amplifier. You can replace
it with a dual-contour, wide-response DM62 magnetic head, and the effect will be more
obvious. It has music details that ordinary magnetic heads cannot distinguish. 6
When making, pay attention to the shielded wire between the magnetic head and the amplifier
, and it should be as short as possible and enough. Just use it.
It is best to shield the prepared head amplifier with an aluminum box to prevent interference. 9 If you make your own circuit board, be sure to separate
the input and output signal lines. 6