Feedback on 555 Monostable Multivibrator

Discussion in 'Feedback and Suggestions' started by allenpitts, Jun 5, 2011.

  1. allenpitts

    Thread Starter Active Member

    Feb 26, 2011
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  2. Wendy

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    Mar 24, 2008
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  3. Wendy

    Moderator

    Mar 24, 2008
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    OK, found it.

    The red jumper wire is a switch. Its function was described in the text, it is there to show why the conditioner is needed. You have to remember that I won't junk up the schematic with switches unless I have to, when a simple piece of wire will do. This is a tutorial, meant to teach the sublties of this circuit.

    Timing starts when the jumper is put into the circuit. With the conditioner (position A) it will proceed normally and time out. When it bypasses the conditioner and illegal condition occurs and the timer will stay high even after it has timed out. This is basically repeating what the text (Instructions) said.

    You can just touch the jumper to point A and ground and get a normal timing operation. With the conditioner, you can leave it connected. On point B, touching the jumper will also start the timing. Where it goes wrong (and is explained with a show and tell) is if the jumper stayes in place.

    This is a non retriggerable monostable, as opposed to a retriggerable type.
     
    Last edited: Jun 6, 2011
  4. allenpitts

    Thread Starter Active Member

    Feb 26, 2011
    77
    7
    Which LED was supposed to come on for three seconds, the green or the red?
     
  5. Wendy

    Moderator

    Mar 24, 2008
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    One stays on, the other stays off, they flip.
     
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