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RE: [softrock40] A SoftRock 6 for 40/20 = harmonic/bandpass sampling

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  • Bill Tracey
    Cash, Thanks for the tip -- picked up a few 74ac04 s from the local electronics surplus parts place and will give it a try. Regards, Bill
    Message 1 of 10 , Apr 26 5:05 PM
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      Cash,

      Thanks for the tip -- picked up a few 74ac04's from the local electronics
      surplus parts place and will give it a try.

      Regards,

      Bill

      At 09:08 AM 4/26/2006, S. Cash Olsen wrote:
      >Bill,
      >
      >Let me share a trick with you. Use a modist size resistor from input to
      >output of the cmos inverter. I would suggest 10K ohms, this biases the
      >gate into the linear region. AC couple the signal source, it's output
      >must swing the input far enough to approximate output saturation. More
      >is ok up to the limit of the input specifications of the chip. Follow
      >this stage with another stage of the same device operated in normal
      >digital mode, some times paralled to drive a 50 ohm load. I suggest the
      >74AC04. I know it works, with a 10K resistor the resonant frequency is
      >about 74MHz.
      >
      >Cash Olsen, KD5SSJ
      >
      >Kits to build Scotty's Spectrum Analyzer
      ><http://www.zianet.com/erg>http://www.zianet.com/erg
      >Scotty's Spectrum Analyzer website
      ><http://users4.ev1.net/%7Ewsprowls/>http://users4.ev1.net/%7Ewsprowls/
      >Yahoo Builders Group
      ><http://groups.yahoo.com/group/spectrumanalyzer/>http://groups.yahoo.com/group/spectrumanalyzer/
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