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  1. jrcfg

    CMOS...floating inputs

    I have read many times in various forums that allowing an input to float is a bad idea...that unused inputs should be pulled up or down.  I always do just that as a result.  Just so I know.... why, specifically, is it a bad idea to float a CMOS input?? And feel free to get technical.... ;D
  2. jrcfg

    ADC output

    Hey all you electronics guru's, I have a qestion about analog to digital converters....I think I have the concept right but would like someone with more experience to let me know...I have an anolog input that varies from ~2.173V to 2.803V (an accelerometer). I have a 10 bit ADC. My voltage...
  3. jrcfg

    Newbie question about transistor Hfe

    Hi all...if a transistor is biased with a +5V, 0.2mA and is switching a +14V source to a load drawing 20mA, then my Hfe is 100. Correct? What happens if the load draws more current...say 40 mA...does the bias current stay the same and only the ratio (Hfe) change to 200? I guess what I'm...
  4. jrcfg

    Cutting PCB's

    Does anyone have any suggestions on a "good" way to cut PCB's...I have tried jig saws, tin snips, dremel tool with cutting wheel...none give a good, clean, straight cut...would a router bit in the dremel work? Thanks.
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