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Speech256/boards/Digilent DE0/README.md
Niels Moseley 42ad37a956 Updated DAC lowpass filter in documentation
2017-10-26 17:57:09 +02:00

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Digilent DE0 board

  • Altera EP3C16F484C6 FPGA

The DAC output is the UART_TX pin. It really needs a 5kHz lowpass filter, otherwise you'll be deafened/greeted by a very loud 10kHz PWM carrier. Try two sections of a 1K ohm series resistor, followed by a 100nF capacitor to ground:



UART_TX pin ----RRRRR--------RRRRR---------o OUTPUT
                        |             |
                        C             C
                        C             C
                        C             C
                        |             |
                       GND           GND