Music fax A1 preamplifier improved line output + super bass electronic crossover line output
Add a subwoofer crossover signal output on the basis of ordinary stereo, and push the subwoofer box to realize the 2.1 function. Stereo left and right channel pre-stage signal input, the crossover point is about 80HZ to 120Hz, compensating for the music low frequency signal to make up for the bass boost effect. This small board looks inconspicuous, but the effect will be impressive and will not be removed once it is used.
Music fax A1 preamplifier board improved version, a good sound board. A generation of famous British music fax A1 famous, senior enthusiasts did not know. This preamp uses the pre-stage original line of the music fax A1, so the effect is very good, the sound field is wide, the dynamic is large, the resolution is high, the warmth is thick, the sound is not modified, and the charm is enduring.
The output of the pre-stage sound is good, the circuit is simple and can make a good sound, who knows who!
This line is added to the primary buffer on the original basis, the signal flow is; amplification ------ volume control ------ buffer ------ left and right channel output --------- - Subwoofer output, the lifting effect is remarkable. It can be equipped with ALPS 16 or 27 blue shell potentiometer.
Exquisite FR4 double-sided fiberglass board, board size 94 × 47mm. Imported RC components, Nissan KOA 1/4W high-precision metal film resistors, US NE5532 three, US NE5534 two, gold-plated IC socket for easy upgrade, Japan ELNA electrolysis, high-quality terminals. Gold-plated hole eight-foot assembly is easy to upgrade, ±15V DC power supply.
You can also adjust the tone by changing the different dual op amps according to your preferences. Upgrade directly to high-end op amps.
Board features:
1, the famous machine line improvement, DC amplification, super bass signal combination, unique design.
2, the line layout is compact and reasonable, exquisite, beautiful and elegant
3, PCB printed with various component parameters and wiring identification, when the component is installed, the number can be seated
4, free of debugging, the component is installed correctly, it will sound good.
LG194B 27 type blue shell into potentiometer
LG194B Nissan ALPS 16 potentiometer
Can also be ordered on request
Note: The NE5532/NE5534 op amp is a second-hand disassemble. The components on the finished board are different according to the assembly batch. The color of the resistor and the brand of the capacitor will be different. The components and parameters on the board are the ones that are received! The op amp is a second-hand disassembled machine, and the finished board inspection is normally sold.