Circuit Schematic Audio Power Amplifier with TDA2050 / LM1875

AudioAmplifier. - Here is Circuit Schematic Audio Power Amplifier with TDA2050 / LM1875. In here we will show you the schematic of this power amplifier, component list and also the description about this schematic like in figure 1 below.

Circuit Schematic

Figure 1. Schematic Audio Power Amplifier with TDA2050 / LM1875
Component List

  • B1 KBU8M FBU4 
  • C1 100nF C050-024X044 
  • C2 100nF C050-024X044 
  • C3 1000uF E5-10,5 
  • C4 1000uF E5-10,5 
  • C6 2.2uF C050-075X075 
  • C7 220nF C050-030X075 
  • C8 22uF E3,5-8 
  • C9 100nF C050-024X044 
  • C10 100nF C050-024X044 
  • C11 1000uF E5-10,5 
  • C12 1000uF E5-10,5 
  • C13 4.7uF E2,5-6 
  • C14 2.2uF C050-075X075 
  • C15 220nF C050-030X075 
  • C16 22uF E3,5-8 
  • C17 4700uF E7,5-18 
  • C18 4700uF E7,5-18 
  • C19 47uF E2,5-7 
  • C20 22uF E3,5-8 
  • C21 22nF C050-025X075 
  • D5 1N4148 DO35-7 
  • D6 1N4004 DO41-10 
  • D7 BZX85C12V DO41Z10 
  • H1 MOUNT-PAD-ROUND3.0 3,0-PAD 
  • IC1 LM1875 T05D 
  • IC2 LM1875 T05D 
  • IC3 UPC1237 SOP8 
  • IN 6410-02 
  • IN1 6410-02 
  • J1 OUT1 AC2 
  • J2 OUT2 AC2 
  • J3 AC AC3 
  • JP1 JP1 
  • K1 G2R2 G2R2 
  • LED 6410-02 
  • LED2 LED5MM 
  • LED3 6410-02 
  • R1 1k 0207/2V 
  • R2 20k 0207/12 
  • R3 22k 0207/7 
  • R4 1M 0207/7 
  • R5 1R 0414V 
  • R6 1k 0207/2V 
  • R7 20k 0207/12 
  • R8 22k 0207/7 
  • R9 1M 0207/7 
  • R10 1R 0414V 
  • R11 2k2 0207/7 
  • R12 120k 0207/7 
  • R13 120k 0207/10 
  • R14 56k 0207/7 
  • R15 9k1 0207/7 
  • R16 10k 0207/7 
  • R17 92k 0207/10 
  • R18 330R 0207/10 
  • R19 68k 0207/7 
  • R20 3k9 0207/10 
  • R21 10k 0207/7 
  • T2 MPSA42 TO92-EBC


Circuit schematic like in figure 1 above is Audio Power Amplifier with TDA2050 / LM1875. This is not an ordinary project, but an attempt to make a PCB that is suitable for TDA2050 and LM1875 and has all the necessary circuitry on board - power supply, speaker protection, delayed turn-on and fast turn-off. This is achieved using the convenient uPC1237 IC.

TDA2050 and LM1875 are pin to pin compatible, the differences in their schematics are the values of a couple resistors and one capacitor. All this allows to make an universal circuit board, suitable for any of these two ICs.

It is 2x30W, but it depend of the power supply voltage and the impedance of the speakers connected to the output.

The Original Article : "Audio Power Amplifier with TDA2050"

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