Xilinx PQ160 FPGA production is a very prepared for project XC95144-you can run the test, the test card. Printed circuit board drawing on input and output connections single circuit hard Crystal 5v regulated to 7805 and passive components. Xilinx XC95144-PQ160 Development Board schematic and pcb printed circuit drawings have been prepared with the proteus, in addition to the test program, isis, ares files..
Source: radiokot.ru/start/mcu_fpga/xilinx/02/
FILE DOWNLOAD LINK LIST (in TXT format): LINKS-18769.zip
Published: 2012/04/26 Tags: avr development board
dsPIC30F2020 Digital Class D Subwoofer Amplifier TC4427A MCP6022
Nowadays, a home cinema system is present is almost every household. Their price range is very wide – from $100 to tens of thousands of dollars. Usually, the subwoofer of a low or middle end system is small so it needs to be with ported design to achieve reasonable response in low frequencies. For movies this seems to be allright, because the subwoofer is used for effects. For playing music, though, the ported design is a problem – it has greater total harmonic distortions (THD) and group time delay than the closed box.
To have good bass response in a relatively small closed box subwoofer, speaker driver is usually pushed to its limits where it has high THD. In this project one very interesting approach is used for reduce the distortions of the speaker and also to extend its bass response. A dual coil speaker driver is used but only one of the coils is connected to the power amplifier – the other is used for electromotive feedback. This method is not new, but is difficult to implement in pure analogue world because of the many parameters that have to be tuned. For easier experimenting and tuning, a dsPIC30F2020 device is used. It not only implements a Proportional-Integral-Derivative controller for the feedback, but with its powerful SMPS controller and ADC drives a ClassD amplifier for the subwoofer! This type of amplifier, called also “digital” amplifier uses pulse-width modulation (PWM) to drive power transistors in switching mod