Tag Archives: LM1875
I built my first amplifier LM1875 in 1992. It was above all the enthusiasm of the amplifier 47 Labs Gaincard and the abundance of copies of itself that followed. I built when I was a student, and given the total expenditure, which was a pretty decent amp.
The circuit shown in the figure, is base the LM1875 chip which has a soft, low distortion (0.015%) when the current is the style of the team is small enough, popular DIY chip amp. Power transistor control output with a more powerful sound warm and soft on the Toshiba power transistor 2SA1943, 2SC5200 (VCM = 180 V, 12 A = ICM, PCM ? 120W, fT = 30 MHz).
TDA2030, LM1875 Active 2.1-Speakers Microlab A6331 Circuit Diagram and PCB layout for Mod Hi-Fi Systems
Design set is made in a similar style, which will place the subwoofer, blending in with the speakers, even on the desktop. Speaker dimensions are relatively small and are 12 × 20 × 16 inches. The body is made of columns made of cardboard, wall thickness is 9 mm. You can use TDA2030 or LM1875 main chip power amplifier satellite and subwoofer. The pre-amp and low pass filter very popular op-amp TL072 or NE5532. You can replace with more low noise op-amp OPA series.
This project uses two chips mono amplifier, the LM1875 from National Semiconductor. This is probably the easiest chip to operate and easier to build from the minimalism Gainclone amplifier. It will be powered by a separate power supply.
LM1875 is pin-compatible replacement and direct chip-like ST Microelectronics, namely the TDA2030, TDA2040 TDA2050, and. It is understood, however, a little better in sound quality compared to the TDA.