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Recent content by 8060A

  1. 8060A

    negative to positive level shifting

    An excellent way to do this voltage translation is to use an HC4053 device. This will translate three lines. Basically you connect Vcc to +5, Vee to -5 and of course gnd to gnd. Your 0-5V logic controls the analog switch control inputs (usually labeled A, B, and C). Then hook the X inputs to GND...
  2. 8060A

    JFET Symmetry

    dau, You did not mention how you are controlling the J309. N Chan JFETs as switches will have varying on resistance from device to device and also the threshold of devices varies as well. Leakage current could also contribute to the difference. When using J309s, I usually pinch them off with at...
  3. 8060A

    Where to buy strain relief?

    For completeness, I like this website that markets the very well made Hummel line from Germany. http://www.sealconusa.com/ Strain reliefs and all kinds of glands.
  4. 8060A

    Sampling Rates for Tensiometer/Strain Gage

    I am a scale designer and work with mechanical engineers in the design of precision load cells. What gdechaine is asking for I believe is how to attach strain gages directly to the armature of the piston. The placement of gages for accurate measurement is an art. When the structure gages must be...
  5. 8060A

    wide temperature alphanumeric displays

    It's quite common to heat LCDs at low temperature. Minco makes a transparent heater that is self regulating. Or you can use a low cost thermostat to turn on the heater at low temperatures. National LM26 is a good choice. I've also used 1 watt surface mount resistors as a heater mounted...
  6. 8060A

    build a millivolt generator

    Actually, you can make a highly accurate millivolt source using matched thin film resistors in a kelvin - varley divider configuration. I have designed and built many millivolt sources of various complexity and resolutions. It can be done with only a 6.5 digit multimeter for matching resistors...
  7. 8060A

    LED for NVIS A

    I'm designing a device with two LED annunciators that must be NVIS A compatible. This device is not in a cockpit and does not require intensity matching. Does anyone know which frequency of LED best meets the requirement. A GAP LED is 555nm, which I think is ideal. However, these are dim by...
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