phototransistor

Discussion in 'The Projects Forum' started by bwaley, Jun 17, 2008.

  1. bwaley

    Thread Starter Member

    Jun 1, 2008
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    0
    I have a three pin phototransistor and have designed a circuit using a two pin(i.e without the base) how can I do the connection this being the only availlable phototransistor as of now?
    Help me identify the pins( hint it has a tag).
     
  2. hgmjr

    Moderator

    Jan 28, 2005
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    Can you supply us with a part number for your phototransistor?

    hgmjr
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The tag is the flag on a TO-18 can that identifies the emitter lead. The next closest lead is the base, and is not usually used with a phototransistor. The remaining lead is the collector. Base current is pretty weenie, so use a large resistor in the collector current for a good signal swing - something like 47 - 100K.
     
  4. bwaley

    Thread Starter Member

    Jun 1, 2008
    27
    0
    further , should I connect the base or leave hanging?
     
  5. beenthere

    Retired Moderator

    Apr 20, 2004
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    Leave the base unconnected.
     
  6. hgmjr

    Moderator

    Jan 28, 2005
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    If you can provide a part number it would make it easier to provide more assistance.

    hgmjr
     
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