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  1. PFF

    POWER SUPPLY ENDURANCE TEST

    We have a small power supply (45 watts, 3.75A at 12VDC) want to know how long it will last. Any idea what would be the quickest way to determine this...not withstanding the manufactures word on it. Could load it down and run the heck out of it. Heat it up etc. Ideas? Thanks
  2. PFF

    Testing power supply

    Hey Guys, Got a question about a switching supply I'm testing. The environment it will be used in is typically at 158 degrees F. So I'm testing it in an oven with a load on it to pull max power non stop. How long do I need to test it to determine if these will work for our needs? I could run it...
  3. PFF

    power supply load changes

    Hi, I'm testing a switching supply that's 45watts at 12 vdc. I put it on a series of power resistors to test it. Set the resistors to 3.2 ohms. After running for a while the resistors got real hot. I turned it off and checked the resistance. It had dropped to .4 ohms due to the heat. How can I...
  4. PFF

    torque

    Hey Guys, Been asked to measure torque on a small electric motor. Any suggestions of some sort of fixture I could throw together to do the job? I'd like to be able to measure the torque at different levels of temperature, current and voltage fluctuations. Thought of using sensors etc. but...
  5. PFF

    What would I need to get into QC?

    Hi Guys, got a bit of a problem. Just about to turn 60 and am finishing a BSEE. A while back finished a AAS in EET. Before that I worked 34 years as a statistician. Have BS and MS in mathematics and statistics. I retired, went back to school in the EE area because I love EE and hoped to work in...
  6. PFF

    Is there any chance

    I'm finishing an EE degree soon at 60 years old. I retired early so that I could go back to school and finish the EE degree I started a long time ago. Have graduate degree in mathematics and 34 years experience as a statistician. At any rate I've been trying to find a job, any job, in the EE...
  7. PFF

    can't find a job

    Hi All, I'm a statistician (age 59) who retired early to return to school to finish engineering degree. Went to an ABET school finished an AAS in EE. Been looking for a job for 15 months. No one will hire me. Is it the economy? My age? Lack of experience? Have I wasted my time pursuing my...
  8. PFF

    main rotor blade failures

    If you are not aware the FAA has issued a sweeping airworthiness directive that requires the retirement of all R22 main rotor blades on or before thier tenth birthday. Normally, it is fatigue cycles or time in service that determines retirement. This directive is very suspicious. I've researched...
  9. PFF

    Complete the Phd or go for MSE?

    I'm currently enrolled in an hybrid Phd. It's an Industrial Engineering program through Colorado State University. Some courses are taught via internet others have parts of the course taught on campus. I'm also admitted to an MSE program at a highly rated engineering school were I live. This...

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