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Recent content by hfavey

  1. hfavey

    Getting my LED's to light up from stepper interface board!!!

    To make sure your wiring is correct, try the following: -Wire your LED the same as our latest sch. -short pin 12 to gnd externally with an extra wire (this is safe, no damage possible). The LED should turn on. If not, reverse the LED. Does it turn on? The transistor in the board will do the...
  2. hfavey

    Lab for radiation pattern measurement

    Hi all, If you don't have in-house facility for radiation pattern measurement, where do you send your antennas to have one measured? I'm on the west coast. Any place to recommend?? Thanks in advance. Hugues
  3. hfavey

    Getting my LED's to light up from stepper interface board!!!

    LED always off? Are you sure about the orientation of the LED? In case of doubt, just wire it the opposite way, you cannot damage anything. If you have a voltmeter handy, can you just measure the voltage on that pin with nothing connect to it for the two cases, no fault and fault. You then...
  4. hfavey

    Getting my LED's to light up from stepper interface board!!!

    I agree with pebe last message. To me the correct connection would be as follow: VDD (24V) | R = 2.2K (for 10mA current in the LED) | - V LED, be careful of the orientation | | pin 12 ---
  5. hfavey

    Getting my LED's to light up from stepper interface board!!!

    I'm trying right now to understand the datasheet. There's this business with the supplies of the opto, but I don't think it's related. Another thing, though: when you connect relays to electronic like here, you need to connect a diode to catch the flyback voltage of the coil when it re-opens...
  6. hfavey

    Getting my LED's to light up from stepper interface board!!!

    Your chip is powered from 2 power supplies, one 5V for the logic and one 24V to power the motor. In your first sketch, current will always flow from 24V to 5V supply through an internal ESD protection diode inside the chip. When the fault comes off, the transistor will activate, bypassing the...
  7. hfavey

    Setup for radiation pattern measurement

    Hi, I'm trying to put in place a setup to measure radiation pattern of 2.4GHz antenna. Right now I've got a turntable controlled by a motion controller and a network analyzer (Agilent 8753ES) all controlled by a Labview VI that we wrote. The vi is turning the table, making an acquisition of S21...
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