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Recent content by Ald

  1. A

    Count sine wave frequency

    The processor, MC68HC12, does have an A/D, but it is my understanding is that it requires 0-5Vdc, that's why I have to do some signal conditioning to convert either frequency or Vpp from the tachometer to match the A/D channel. If there is an easier way I'm all for it.
  2. A

    Count sine wave frequency

    My original plan was to take the 36.3 Vpp divide it down then rectify and scale it to produce 5vdc full scale that would go to the ADC of the processor. Depending on the rpm of the motor I'm measuring the output would be 0-5vdc, corresponding 0-900rpm. The problem with this is I have to figure...
  3. A

    Count sine wave frequency

    A lot of good ideas, the peak-to-peak amplitude is 36.3 Vpp, the problem is the amplitude of the signal of the tachometer also varies with the speed the tachometer is measuring, 0-36.3 Vpp.
  4. A

    Count sine wave frequency

    I need to design a circuit that will count the frequency of a sine wave only, from 0 to 900 Hz. I do not need a display, I will have to take the count and scale it and convert it to 5vdc max for output to a micro processor. Right now my concern is the counter. The input signal is from a tachometer.
  5. A

    74LS90 act like 4017 counter

    Great thanks for the help
  6. A

    74LS90 act like 4017 counter

    Thanks much I'll give it a try
  7. A

    74LS90 act like 4017 counter

    This is what I have at the moment.
  8. A

    74LS90 act like 4017 counter

    Hi I am doing a simulation and I don't have a model for the 4017 only the ls90, so I'm trying to work around. I can't even get the LS90 to count in BCD at the moment
  9. A

    74LS90 act like 4017 counter

    How can I configure a 74Ls90 to act like a 4017 decade counter. I don't want BCD out want one single pulse per clock, I only need to count to 4.
  10. A

    4017 Decade counter model

    Can anyone tell me where I can get a 4017 decade counter model for use with the B 2 Logic sw simulator?
  11. A

    Tail Light Sequencer

    How can I modify the circuit to create a right turn signal (of course would mirror it for the left turn signal). Using only three LEDs. To show the turning direction, by turning on three LEDs in sequence (no lights; inner light; inner two lights; all three lights; repeat). There is also an...
  12. A

    Calc Max peak to peak output swing

    What part of the circuit would you like me to make clearer, when I open it, it looks clear. Did you double click on it? Good question on the level of distortion, I don't have figure. Is there a starting calculation that I can use that should get me close to some level of visual distortion? Thanks
  13. A

    Calc Max peak to peak output swing

    Attached is a bipolar op amp I designed, how do I calculate the max peak-to-peak output swing and the max input voltage that can be applied without any distortion.
  14. A

    DAC accuracy

    I've run an experiment on an active filter. I am using the NI Elvis prototyping board. The frequency response is taken with the NI Bode analyzer and I saved the output data in a text file. The Bode analyzer amplitude spec is give as 12 or 16 bits, how do I calculate the amplitude error using the...
  15. A

    Current limiting resistor for led on 7408 gate output

    Thanks a lot for your help, you've taught me a lot.
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