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Type: Posts; User: jasonc2

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  1. Closed: Re: request help on connecting computer to microcontroller(atmega8l)

    I did not look at your code in detail nor do I know if you are having other hardware issues but what stands out to me is your usage of fscanf to read a sequence of raw binary data coming in the port...
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    Closed: Estimating power supply AC load

    I have a 120VAC -> 24VDC power supply rated at 85% efficiency, and a 0.8W power dissipation with no load.

    The device it is powering draws 110mA max = 2.64W.

    I want to find a reasonable upper...
  3. Closed: Re: request help on connecting computer to microcontroller(atmega8l)

    Sscanf won't process the data until the terminator character (which you can specify) arrives on the line. Either make sure your device is sending the expected terminator character as necessary, or...
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    Closed: Terminal Block Color

    I need a rail-mount terminal block to run a local DC ground to one side of a number of relays, for use with a dry (ground/open) digital input module. One terminal to power supply ground, the rest to...
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    Closed: Re: I need the idea for data transfer

    Set up a lan with wifi access points?
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    Closed: Re: Schmitt Trigger Oscillator

    I wasn't paying attention again and missed your clear +-12 -> +- 18 comment. My comment was based on the assumption that you only wanted -18. It is clear to me now that you are intending to boost 24...
  7. Closed: Re: Fast Fourier Transform

    Kst can do that as well.
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    Closed: Re: I need the idea for data transfer

    A GSM modem, wifi on each end with an access point and use the internet, a satellite modem such as this one, smoke signals. Can you be more specific about your requirements?
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    Closed: Re: Schmitt Trigger Oscillator

    Why did you reverse the polarity of anything?

    Replacing 0 and +12 with -12 and 0 doesn't change any relative polarities, it just shifts the 0 point and subtracts 12 from the numbers you previously...
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    Closed: Re: Schmitt Trigger Oscillator

    Just a quick idea: If and only if you don't require a common 0V reference with the computer, just hook your ATX gnd to the +12 input of this circuit (unmodified), and your ATX -12 to the ground of...
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    Closed: Re: Small problem- bad thing

    I can't offer any advice about the power supply but check the fuse in your DMM, replace fuse if necessary. Details will be in the manual.
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    Closed: Re: Current Loop Transmitter Suggestions

    4mA - 20mA is pretty standard.

    How much current do you need? What signal frequencies are you dealing with? What line voltage drop / resistance are you expecting? You need to give more details.
    ...
  13. Closed: Re: Need Spice models for 4.7uF capacitor from Murata.

    If you can purchase from Kemet instead they have free software that generates models for all their capacitors (Kemet only, though): http://www.kemet.com/page/kemsoft

    You might be able to find some...
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    Closed: Re: Schmitt Trigger Oscillator

    I mixed up the circuits being referred to. Sorry about that.
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    Closed: Re: Discrete transistor multivibrator.

    I am referring to the maximum time step simulator option, which in multisim is the TMAX option described here: http://www.ni.com/white-paper/12774/en

    Try setting it to e.g. 1usec (1e-6).

    It is...
  16. Closed: Re: Fast Fourier Transform

    If you can export the oscilloscope reading to a file (e.g. CSV), check out kst2: http://kst-plot.kde.org/

    It's a great (and free) data visualization and plotting software. It's very easy to use.
    ...
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    Closed: Re: Discrete transistor multivibrator.

    That noise should not be there. Try reducing your maximum time step in multisim.
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    Closed: Re: Schmitt Trigger Oscillator

    LM741 min supply voltage is 10Vpp, a ±5V dual supply will be fine.



    Changing resistors will not adjust the duty cycle of the oscillators from post #3.



    You'll want a dual supply for the...
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    Closed: Re: Question about inductors

    TLN2026 is identified as an 11u inductor in a parts list here: http://www.electronica-pt.com/images/fbfiles/files/RP4303_PE_5_projector_.pdf

    Need more info about the others.
  20. Closed: Re: data trasfer from mobile bluetooth to bluetooth module in microcontroller kit

    What kind of phone and what microcontroller kit?
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    Closed: Re: Discrete transistor multivibrator.

    It should work, can you post your circuit? Also how are you determining that the signal is erratic and untidy?
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    Closed: Re: Schmitt Trigger Oscillator

    That symbol in the yellow image is not an op amp; it is a symbol for an inverting Schmitt trigger (the symbols can be inconsistent though).

    The part number 40106 in the other image is...
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    Closed: Re: Schmitt Trigger Oscillator

    What in ***'s name are you trying to do with that poor op amp?

    Things to try:
    - Sane pin connections.
    - Google image search for "Schmitt trigger oscillator".

    What are you basing this circuit...
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    Closed: Re: Power supply OR-ing subcircuit

    I guess I missed the 7W load part. I saw 15V somewhere and uA somewhere else.
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    Closed: Re: 12V to 18V 555 based boost converter circuit

    You do it the same way you boost a positive voltage. Run this:
    ...
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