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First project ever. Where do i begin? - Page 2 — Parallax Forums

First project ever. Where do i begin?

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  • cavelambcavelamb Posts: 720
    edited 2012-02-11 09:30
    Leon wrote: »
    It won't work very well. :)

    Actually, it won't work at all...

    I'm posting this as a starting point - because I doubt this will work in this case,
    but it should be a lot closer to it. The problem here is that the coil voltage is +12v,
    while the base s being driven at only +3V. I'm WAY to long out of date to offer a fix.

    But at least we aren't putting high volts on the Prop's output pin!
    Solenoid.jpg
    922 x 805 - 93K
  • annonymousannonymous Posts: 14
    edited 2012-02-12 19:44
    Leon you were right. It is not working at all =( Here's a video. http://www.youtube.com/watch?v=2_bhktQOEpY&feature=youtube_gdata_player
  • kwinnkwinn Posts: 8,697
    edited 2012-02-12 20:15
    cavelamb wrote: »
    Actually, it won't work at all...

    I'm posting this as a starting point - because I doubt this will work in this case,
    but it should be a lot closer to it. The problem here is that the coil voltage is +12v,
    while the base s being driven at only +3V. I'm WAY to long out of date to offer a fix.

    But at least we aren't putting high volts on the Prop's output pin!
    Solenoid.jpg

    The circuit in this post should work just fine if +V is the same as the relay coil voltage and the transistor gain is high enough to provide the current the coil requires to operate. The resistor between P16 and the base could also be reduced somewhat to increase current if required.
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