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Recent content by jeremys

  1. J

    Driving LED from sound card

    modulation Hi - the modulation was just to be able to get low frequency waves through the sound card. I think the specs say they only output down to 20 Hz. I'll just give an LED a go and see whether it works before trying anything more complex. Thanks! It was a white LED BTW. The experiment...
  2. J

    Driving LED from sound card

    PS Here is the envelope detector circuit http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/RadCom/part9/page2.html
  3. J

    Driving LED from sound card

    Hi - I haven't done any electronics for a decade or two, so sorry if I look stupid. I working on a science experiment which requires a the brightness of an LED to be modulated with a waveform up to around 100-150 Hz, but down to low frequencies, maybe 1 Hz. The frequency needs to be...
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