DavidEQ 4 Posted August 7, 2011 Author Share Posted August 7, 2011 Sine or square wave output, David? A simple NCO (numerically controlled oscillator) might work but generating a 4 kHz sine wave from a 32 kHz loop would only provide eight (8) sine samples per cycle so a 4 kHz output would be a crude looking sine wave. Maybe I'm not really sure but I thought you could get a decent sine wave out up to 40% or so of the sample (nco/dds) rate if I have a good low pass filter on the output. It works for radio. I checked and the highest tone I really need to make is 3400 hz and I have simulated 4khz or so (its a littler higher I lowered the series resistors to make the oupt at 3400 a little higher) in a design program using a quad op amp. The simulation shows a low level ~2khz spur with no input I have to look into however. The whole project looks like it would be easier with a TMS32 chip, they have a built in DAC. more IO pins and about the same price at Mouser. http://hackaday.com/2011/08/03/an-arm-dev-board-you-can-make-at-home/ Quote Link to post Share on other sites
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