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Thread: Presslab I have a problem... again...

  1. #1
    Variable Bitrate
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    Post Presslab I have a problem... again...

    Presslab (or anyone who knows a bit 'bout electronics) I have a question concerning D1 in your schematic, the BYV32E, this component looks like a transistor, right (has three pins)? so how do I connect this? I haven's got a clue, try using my multimeter to make sence of this part but...

    ohw forgot :
    the 1.5KE27CA Diode has no polarity is this correct? it doesn't matter how I solder this in?

    tnx

    [ 11-15-2001: Message edited by: marsjell ]
    If at first you don't succeed.........
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    for info on t6369c LCD or Presslab's powersupply check:
    http://www.namms.tk <=updated!!

  2. #2
    Retired Admin Aaron Cake's Avatar
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    Cool

    For the transistor, get a databook from the manufacturer, or check their website. It will have all the pinout info, and is just a generally useful thing to have.

    Diodes are polar. That's sort of the point of the device . The line on the diode case matches the line the arrow points to in the schematic.

    I think I have diode info at http://www.aaroncake.net/electronics/schem.htm
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  3. #3
    Variable Bitrate
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    The line on the diode case matches the line the arrow
    that's the point, this 1.5KE27CA doesn't, it has absolutly no indicator.

    The BYV32E is a diode, but it looks like a transistor, it has three pins, after finding a datasheet it's a comp. with two diodes in it. problem is that I don't know whether to use just 2 pins (so 1 diode) or use this thing like 2 diodes in parallel, 2 anodes and 1 kathode
    If at first you don't succeed.........
    destroy all evidence you tried

    for info on t6369c LCD or Presslab's powersupply check:
    http://www.namms.tk <=updated!!

  4. #4
    Retired Admin Aaron Cake's Avatar
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    Cool

    Originally posted by marsjell:
    <STRONG>
    that's the point, this 1.5KE27CA doesn't, it has absolutly no indicator.
    </STRONG>
    Hm, that would be a problem. You will need to use a multimeter with a diode test function to figure out which end is which.
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  5. #5
    Variable Bitrate
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    You will need to use a multimeter with a diode test function to figure out which end is which
    uhm that doesn't work... tried that but either way it (mmeter) gives the same result, being the same like when you connect a diode the "wrong" way
    If at first you don't succeed.........
    destroy all evidence you tried

    for info on t6369c LCD or Presslab's powersupply check:
    http://www.namms.tk <=updated!!

  6. #6
    Raw Wave Rob Withey's Avatar
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    Hate to say it folks, but the 1.5KE27CA isn't a diode. :-)
    http://www.fairchildsemi.com/pf/1./1.5KE27CA.html

    Well, actually it's a bit like a Zener, but with a fast reaction time, no forward conduction, and an ability to dump a huge amount of current (so not even much like a Zener after all).


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    Rob

    [ 11-16-2001: Message edited by: Rob Withey ]
    Old Systems retired due to new car
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  7. #7
    FLAC Mastero's Avatar
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    What are we talking about here guys .. i knw some diode or etc.. but which circuit is this .. is there a spec... ??

    hello

    MAstero

  8. #8
    Variable Bitrate
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    Rob : I'm not much off an electronics man, I simply do what presslab has instructed me to do would you be so kind to see if the 1.5KE27CA makes any sense in his schematic?schematic, thanx.. ohw forgot that would be D3 in the schematic

    mastero: we're (atleast I am) talking about presslabs forwardconverter, modifying a standard ATX psu for incar use..http://www.mp3car.com/cgi-bin/ultima...c&f=9&t=000121

    [ 11-17-2001: Message edited by: marsjell ]

    [ 11-17-2001: Message edited by: marsjell ]
    If at first you don't succeed.........
    destroy all evidence you tried

    for info on t6369c LCD or Presslab's powersupply check:
    http://www.namms.tk <=updated!!

  9. #9
    Raw Wave Rob Withey's Avatar
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    D3 looks like a regular schottky diode to me (different from regular diodes because they have a very fast recovery time and a smaller forward bias voltage). You appear to be using a transient voltage suppressor in it's place (and a bi-directional one at that) - doesn't sound like a good idea to me.

    Now D2 on the other hand is a Zener type thing. You can get the transient voltage protection with the device you mention. With a bi-directional/non-polarised device such as you have, this would not give you protection against reversing the inputs - since the device cannot be forward biased, it wouldn't short when reversed and wouldn't blow a fuse.

    Hope that helps...


    Rob

    [ 11-17-2001: Message edited by: Rob Withey ]
    Old Systems retired due to new car
    New system at design/prototype stage on BeagleBoard.

  10. #10
    Variable Bitrate
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    oops my screwup, it was D2 in the schematic.. sorry anyways, so that would work fine, great. Now all I need to know how to connect the BYV32E.... D1 in the scheme...
    If at first you don't succeed.........
    destroy all evidence you tried

    for info on t6369c LCD or Presslab's powersupply check:
    http://www.namms.tk <=updated!!

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