Custom Upgraded version of single channel 400W amplifier board 1943+5200 high-power rear stage PCB empty board

There is a place on the board labeled 2K and 330, which means that 2K adjustable resistors can be soldered here, or 330 ohm resistors can be soldered.

104 is the capacitor 104*6 is here there are 6 components welding 104 = 0.1uF capacitor, 221 is 220pF capacitor, 220 and 330 is the resistance unit is Europe 104 * 6 means that these six places are welding 0.1uF capacitor. OUT is the output. 104 represents a 0.1uF capacitor.

Capacitance withstand voltage is 50V

0.22 is 0.22R cement resistor

0.22 is 0.22R non-inductive cement resistor

10 and 68R are 1W watt resistor 0.22R is 2W watt, and 5W can be 1uF-10uF polyester capacitor and electrolytic capacitor can be welded, we use 4.7uF, electrolytic capacitor should pay attention to polarity, 4.7K large, with 2W and 5W will do