Application circuit of TEA0665

fEA0665N is the third generation of professional-grade Dolby B|(II) noise reduction integrated circuit produced by Philips . The circuit has
extremely low harmonic distortion (0.08 桡L Dolby C) and excellent signal-to-noise ratio (S gate, = 76dB--Dolby C), with
the fewest external components among similar circuits. The circuit includes a Luo preamplifier and a composite filter buffer, a noise reduction processing error analysis circuit,
a spectrum offset and an anti-saturation circuit to enable tape playback The modulation distortion and transient distortion caused by adding the noise reducer to the system
are minimized, and the residual noise of the tape during playback is extremely low. The circuit provides two output ports with different levels, which can be adjusted according to
the input of the power amplifier circuit. The sensitivity can be flexibly selected and is very convenient to use. Its application circuit is shown in Figure 5-8. The electrical performance
parameters are shown in Table 5-5.
    When TEA0665N is used in conjunction with TDA1602A, it can easily solve the Dolby level interface Problem. In
the past, when the recording circuits and Dolby circuits produced by various manufacturers were used together, complex debugging processes were often required to achieve
the effect of the circuit, such as the Dolby series of Dolby BC noise reduction circuits introduced earlier. This is difficult to accomplish under amateur conditions
. If the TE A0665 circuit is used, a complete set of high-fidelity speakers with Dolby BC noise reduction and
professional-level electroacoustic indicators can be formed without complicated debugging. Tape recording and playback system. Due to the use of Dolby C and the full use of the
excellent recording performance of 'I'DA1602A (presettable ALC and low-distortion recording bias magnetic oscillation circuit),
the dynamic range and dynamic range when recording CD programs are The signal-to-noise ratio is far superior to ordinary recording and playback circuits, and the copied tape is almost the same as the original CD program.