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???
04/19/12 23:14
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 		 #187228 - Give it a try...
Responding to: ???'s previous message
Mahmood said:
Should there be a reason why PLL solution can't work below 10 Hz?

It can have to do with the customer's signal which loses shape at very low frequencies. A signal analysis "in the field" could help. Does your customer have a data logger?

Mahmood said:
Maybe I should use the 3 resistor method because I'm using single supply for the 4046. should I try it or go to uC solution?

Give it a try...

Kai Klaas

List of 52 messages in thread
TopicAuthorDate
frequency multiplier x 10            01/01/70 00:00      
   You need some specs first.            01/01/70 00:00      
      and even more questions for your tutor            01/01/70 00:00      
   Analog solution...            01/01/70 00:00      
      Input wave form            01/01/70 00:00      
      Too Bad...            01/01/70 00:00      
   have you considered a "rate multiplier"?            01/01/70 00:00      
   PCA?            01/01/70 00:00      
      PCA Yes            01/01/70 00:00      
   Update            01/01/70 00:00      
      2 i.c.s plus 6 R, C            01/01/70 00:00      
      4046 / 7490            01/01/70 00:00      
      I put my bet in the digital solution            01/01/70 00:00      
         digital solution            01/01/70 00:00      
            MCU / CPLD            01/01/70 00:00      
            Simple digital solution...            01/01/70 00:00      
               Engine too fast            01/01/70 00:00      
                  it could be made simpler            01/01/70 00:00      
                     cute            01/01/70 00:00      
               OR            01/01/70 00:00      
   Frequency Multipiler            01/01/70 00:00      
      Motivation?            01/01/70 00:00      
         Motivation ?????????            01/01/70 00:00      
            Motives            01/01/70 00:00      
               OK            01/01/70 00:00      
                  motivation guess            01/01/70 00:00      
                     I had the same feeling...            01/01/70 00:00      
                        and if you looked at any of his previous posts ...            01/01/70 00:00      
   A number of thins concern me ...            01/01/70 00:00      
      answers            01/01/70 00:00      
      Boring...            01/01/70 00:00      
         And in this case...            01/01/70 00:00      
            Yes ... but ...            01/01/70 00:00      
               Making what you need, from what you can get..            01/01/70 00:00      
                  slogans            01/01/70 00:00      
                  Is that what the display needs?            01/01/70 00:00      
                     10-700 Hz is expected output frequency - not input frequency            01/01/70 00:00      
                        I did make one mistake            01/01/70 00:00      
                           old rpm analog (or digital) display is what they have            01/01/70 00:00      
                              bursts...            01/01/70 00:00      
                                 See LM2917 for ancient tacho examples            01/01/70 00:00      
   PLL            01/01/70 00:00      
   More detail?            01/01/70 00:00      
      Yes, more details, please...            01/01/70 00:00      
         Details            01/01/70 00:00      
            This can have to do ...            01/01/70 00:00      
               sharp edges            01/01/70 00:00      
                  Which phase-detector?            01/01/70 00:00      
               re: this can have            01/01/70 00:00      
                  What I would do...            01/01/70 00:00      
                     Very Low Frequency            01/01/70 00:00      
                        Give it a try...            01/01/70 00:00      

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