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Recent content by elisemark

  1. E

    LabView Data Acquisition for vendors other than NI

    ask the manufacturer if they have developped a labview library for that specific device , you need the dlls files
  2. E

    [SOLVED] Trim pot unable to remove DC offset

    Hi all, I have a simple circuit , where I take a signal and remove the DC offset with a trim pot prior to Amplifying signal through an active RC filter (TL081) . Now I can adjust the pot and get the signal close to 0 removing the offset but then after few sec the signal goes higher and...
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    [SOLVED] 4538 Monostable multivibrator F/V converter

    Again thanks for your feedback , yes for demodulation I was thinking of the 4046 but if there is any other method that is simpler I would like to try those . I know I could even use just the 4046 for the whole thing and not need another F/V ic but the loop filter design did not work well for me...
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    [SOLVED] 4538 Monostable multivibrator F/V converter

    Thanks for your input. looks like applying a scmitt trigger may work better and easier than the other methods. how about using a frequency divider such as 4040 IC in order to bring the signal in a proper range that the 4538 series can handle ? for demodulation is PLL ICs the best way to do it ?
  5. E

    [SOLVED] 4538 Monostable multivibrator F/V converter

    Thanks KJ6EAD , from the document you pointed to the maximum input signal is determined by the time constant so in this case it is 10 KHz because Fmax=1/tau=1/(0.001uF*10Kohms) =10Khz . help me understand one more thing , it looks like the input must be a square wave and in my case I have a...
  6. E

    [SOLVED] 4538 Monostable multivibrator F/V converter

    anyone has a working example in which the 4538Monostable was used for frequency to voltage conversion ?
  7. E

    [SOLVED] Frequency to Voltage conversion using Monostable Multivibrator

    anyone has any schematic on how to design the F/V converter circuit given my oscillator resonnating at 800Khz using the 4538 monostable ? also can the LM331 work at such high frequencies ?
  8. E

    [SOLVED] CD4046 VCO design, PLL parameters and it did work

    Re: CD4046 VCO design Problems Thanks IanP , the documentation you pointed to is very helpful
  9. E

    [SOLVED] CD4046 VCO design, PLL parameters and it did work

    VCO frequency problem in my circuit design I am sending an oscillator output signal into a CD4046 PLL, the oscillator frequency is around 850KHz, now I calculated all the PLL parameters well and it did work for a while then now I have a nice square wave(@310KHz free running) as soon as I...
  10. E

    [SOLVED] VCO frequency problem

    in my circuit design I am sending an oscillator output signal into a CD4046 PLL, the oscillator frequency is around 850KHz, now I calculated all the PLL parameters well and it did work for a while then now I have a nice square wave(@310KHz free running) as soon as I connect the oscillator signal...
  11. E

    [SOLVED] Colpitts oscillator problem

    Thanks all for your great feedback .
  12. E

    [SOLVED] Colpitts oscillator problem

    thanks RcinFLA, the coil size I is fixed and can only vary between 4 and 6uH . Now Fc on the hand I can be flexible let say i change Fc to 200Khz and I calculate new C2 and C3 ( I will make them equal) and remove C1 will the oscillator start ? What if I want a higher frequency such as 1.5MHz...
  13. E

    [SOLVED] Colpitts oscillator problem

    Any idea why the attached Colpitts oscillator won't start ? I built the oscillator circuit and I get a flat signal with an offset close to the input voltage (5V). thanks
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    [SOLVED] Frequency to Voltage conversion using Monostable Multivibrator

    thansk FvM for the Cd4046 as far as the VCO I have C4 set to 470pf and R at pin 11 set at 10K (correction my Fc=850Khz) this should work.
  15. E

    [SOLVED] Frequency to Voltage conversion using Monostable Multivibrator

    I have an LC resonnator /oscillator at 800Khz and the frequency is changing as the coil length changes. I need to output a dc signal that is varying as function of my signal frequency change . I tried PLL with Cd4046 with no luck . anyone has any idea how to achieve this with a HEF4538B or...
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