GC Version LM1875 Parallel Power Amplifier Board 45W 60W PCB Empty board Bare Board

• The GG version is the full name of Gaincard. It is a very good-sounding LM1875 circuit that has been optimized through repeated comparison and verification. It has a wide frequency band, is delicate, durable, and has a stable midpoint. If you have never played LM1875, it is recommended to buy it and try it. , if the user who has bought the LM1875 can buy it as an upgrade.

  The principle is that the voltage of the two input terminals of the inverting amplifier circuit is always 0, and does not change with the input signal. The input voltage of the transistor (FET) at the input terminal of the amplifier is constant, and the bias state always maintains a suitable operating point.
  Generally speaking, the single output of LM8175 is 4A current, which is the official indicator, low drive sensitivity, and heavy-duty speakers. It is useless to use BTL, and the driving force will not be enough. With 4-way output, the driving current can be doubled to 16A current. , so that the sound field is better, the medium and low frequencies are fuller, and the power is also improved. One channel is output by 4 pieces of LM1875, the quiescent current is 4 times higher than that of a single chip, the current of the whole board is about 0.5A, and it is pure Class A state at medium and small volume. , the vocals are very delicate, natural, full, more comfortable than 1969 Class A, and can be successful without tedious debugging

  Product Highlights:

  Adopt good sound CG circuit structure, the midpoint is stable, 4 parallel X2 small class A output

  PCB size "185MMX98MM board is double-layer PCB
  Large electrolytic capacitor diameter 30mm
  The spacing before the two chips is 22mm

  Power supply range: AC12-AC22X2
  Output power: 45W-8 ohms 60W 4 ohms (5W under pure class A)
  Impedance range: 1-8 ohms
  Frequency response: 10HZ-40KHZ
  Radiator size 200*40*62
  Recommended transformer (recommended to choose 18V)