1) The design comes from the TDA1541 circuit of the 10th anniversary of the forum;
2) The latest upgrade in 2020, adding display module interface, USB, optical fiber, Bluetooth expansion interface;
2) This connection is only a semi-finished decoder board, not including SAA7220 and TDA1541.
3) PCB size: length 200x width 175;
4) The PCB board uses FR-4 military grade, 4-layer circuit, board thickness 2mm, immersion gold design, 20Z copper;
5) The digital part uses domestic 718 factory military resistance, 1% metal film, 50PPM;
6) Taiwan high-precision 15PPM is used around the power supply and analog part of the op amp, with an error of 0.1% metal film resistor
(You are not mistaken, it is one-thousandth, the error color circle is purple, brown is percent
Poor);
7) The film capacitors are mainly WIMA brand, some of which use Philips, Siemens, ERO;
8) The main electrolysis uses Ina ultra-low internal resistance aluminum electrolysis 5600uF, and the decoupling uses Panasonic FM series
220uF and Sanyo SP series 270uF,
9) All IC sockets use genuine Taiwan Linggong gold-plated round hole sockets;
10) The op amp uses the original imported authentic T I 5534+JRC5534DD;
(There are test instructions behind the matching reasons).
11) The board has been debugged, and the TDA1541 is plugged in to listen to the song for more than 2 hours;
After receiving, the buyer only needs to connect the power supply, plug in. SAA7220 and TDA1541 can be used normally.
If you need 7220 and 1541, please contact customer service.
12) Power requirements: dual AC13-15V + single AC7-9V