Identify coil?

Discussion in 'Electronics Resources' started by spinnaker, Dec 30, 2010.

  1. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    4,884
    1,005
    I have several small coils. They are red, a little under .25 in diameter and a little over ,25 in height.

    They have a number

    99800
    2534
    -24J

    Anyway to determine the value of these coils barring using an inductance meter?
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,346
    Hello,

    Can you post a picture of the coils?

    Bertus
     
  3. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    4,884
    1,005
    I plan to salvage them

    [​IMG]
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,346
    spinnaker likes this.
  5. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    4,884
    1,005
  6. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,346
  7. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    4,884
    1,005
  8. maxpower097

    Well-Known Member

    Feb 20, 2009
    795
    388
    ....................................................................
     
    Last edited: Jan 16, 2011
  9. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    Metal can 2N2222 transistor there, an old circuit. I'd suggest not saving the electrolytic caps.
     
  10. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    4,884
    1,005

    Yeah was not planning on it. These are the leftovers of an old energy management system.

    The operator interface software ran on a PDP 11/34 originally. I rewrote the software to run on a PDP 11/34. We were able to unplug the 11/34 amd plug in the PC. Pretty cool.
     
  11. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    Hallmark of a good hardware design!

    I'm guessing that rewriting the 11/34 code to run on a 11/34 wasn't too much of a task. :p

    (I know you meant PC, I mess up a lot and gotta slow down with posts)
     
  12. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
    4,884
    1,005

    It was tough. Hard part was talking to the FIDs (Field Interface Device) which had the binary inputs and outputs and analog I/O.

    The documentation for the protocol pretty much sucked. I had to first right a serial data analyzer that I placed in line with the 34 and the FID. I could then watch the protocol. Between that and the lousy documentation I was able to develop an API.

    I had multiple terminals and the ability for the user to plug in their own formulas to be able to interpret analog data in different ways (temperature, pressure, humidity etc.).

    One site they were in a real bind. They had no more space in their security office for a fire panel for a new tower (fire panels needed to be all hard wired direct to the sensors (no computer) ). A fire panel is about the size of a phone booth. A 11/34 is about the size of a phone booth. We unplugged the 304 and rolled it out the door and plugged in a brand new 75MHZ state of the are PC. :)
     
Loading...