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Thanks for the help!

Discussion in 'Electronic Basics' started by Thomas A. Horsley, Mar 26, 2005.

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  1. Just thought the folks who helped me out in this group might be interested
    to know that (I think :) I'm finally finished with my cell phone ring
    notifier gadget - made the last tweak a few days ago, and as near as I can
    tell, it is now working flawlessly:

    http://home.att.net/~Tom.Horsley/markII/markII.html

    The only unknown at this point is how long the battery will last...
    --email: icbm: Delray Beach, FL |
    <URL:http://home.att.net/~Tom.Horsley> Free Software and Politics <<==+
     

  2. Assuming I've read your schematics for the Mark II correctly, it appears you
    are using an LM555C (instead of LMC555) and it is your main power hog.
    Since the LM555C uses something kind of around 5mA of supply current, this
    would suggest a battery life of around 120 hours (assuming 9V alkaline
    battery rated about 600mAh capacity) of use when the circuit is actively
    powered. Fortunately for you the 555 comes in a CMOS flavor which has
    dramatically lower power consumption, is pin compatible, and is otherwise
    quite similar to the bipolar LM555C. The LMC555 has a typical current
    consumption more on the order of 120uA.

    http://cache.national.com/ds/LM/LMC555.pdf
     
  3. Assuming I've read your schematics for the Mark II correctly, it appears you
    Actually, I am using the CMOS 555, I probably just neglected to change
    the label in the schematic. According to my multi-meter the whole thing
    draws 0.3mA while just sitting around waiting for the phone to ring.
    --email: icbm: Delray Beach, FL |
    <URL:http://home.att.net/~Tom.Horsley> Free Software and Politics <<==+
     

  4. Oh great. In that case it sounds like you are in business. Battery life
    should be quite decent.
     
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