DIY raises Jiruidong Fang Zhizi the acoustic quality of 6 dish CD

The former outfit acoustics of ZZ is the RC826 that Xi Menzi VDO manufactures. The buy before using what the pine falls core of 6 dish machine, tone IC is TDA7342, have output of the two buy before the road. The sound of this machine contains the common fault —— of cheap lead plane to explain force is small, in high frequency and coarse, low frequency strength is insufficient, overall acoustic quality says than what control 1000 yuan this lead plane should be differred a lot of. But, the foundation of this machine is good still, through small it is OK to transform give out those who be equivalent to 1500 yuan of level to say the acoustic quality effect of this lead plane.

Good, tear open from the car first deplane child: The aperture that inserts acoustics face edition and casing of peach wood adornment with credit card is played the part of gently can take draw a frame round of peach wood adornment, fold the 4 Luo silk of fixed lead plane with M10 sleeve fall to be able to accuse leader from which the stage is dialed, the antenna that folds lead plane backside and join outlet take out lead plane. Next ordinal tear open next lead plane to control machine of installing plate, fluctuation to build (lever with the penknife directly) , in front core of edition, machine (the left and right sides secures Luo silk twice each) , main circuit board came out with respect to dew.

The main circuit that this is VDO RC826 board:

An intermediate the biggest IC is CPU, another square is smaller is tone IC——TDA7342, outlet of lower part white is used at the join with machine core (D/A changeover is finished in machine core interior) , the I/V that what be surrounded by 7 capacitance on the side is CD signal changes IC——JRC4558, right be frequency enlarge and power source part.

The electric principle of TDA7342 pursues:

Lower part is 4 frequency input, — of selector of course news source " lotus root adds up to capacitance C10, C11— " Jing Yin controls — " wait for loudness to control — " bass adjusts — " tall tone rectifies — " volume adjusts output to for the four tones of classical Chinese phonetics.

Among them the 5th, 10, 11 feet are CD frequency originally the input uses (inside buy I/V change-over circuit) , but actually this left a car to carry phone function to use all the way (the lead plane of QR of form a complete set does not have this function) , what CD input uses is the 6th, 12 feet, and the buy outside I/V change-over circuit (put with double carry JRC4558 electroanalysises with 6 the composition such as capacitance is corresponding circuit) .