SPECIFICATIONS

The board size is 15CMX18CM, 2.0 thick, 2oz copper platinum.

 

 

 

The fire ox needs double 18-20 volts, single 12-15 volts, single 9-12 volts.

 

 

 

Input mode supports coaxial and optical fiber.

 

 

 

Select LES for input signal.

 

LES is a coaxial input or optical input switch, the default is coaxial input, short circuit is optical input.

 

 

 

Add two LEDs for coaxial and optical switching instructions, so that the input signal selection is clear at a glance.

 

 

 

 

 

  About 1541 board power supply voltage and debugging.

 

 

 

AC dual 20 volts rectified by MR756 or BY228 317 and 337 independently stabilized 15 volts to 18 volts for operational amplifier chips.

 

 

 

AC single 15 volts are rectified by MR756 or BY228. Three groups of 317 independent regulated positive 5 volts are supplied to CS8412, SAA7220, 1541 respectively.

 

 

 

AC single 12 volts are rectified by MR756 or BY228, and two sets of 337 independently stabilized negative 5 volts and negative 15 volts are supplied to 1541 respectively.

 

 

 

Q1 and Q2 adjust and stabilize 15V to 18V for operational amplifier

 

 

 

Q3 adjusts the voltage regulator positive 5 volts for CS8412

 

 

 

Q4 adjusts the voltage regulator positive 5 volts for TDA1541

 

 

 

Q5 adjusts the regulated negative 5 volts for TDA1541

 

 

 

Q6 adjusts and stabilizes negative 15 volts for TDA1541

 

 

 

Q7 adjusts the voltage regulator to 5 volts for SAA7220