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Power supply

Discussion in 'Electronic Basics' started by John Griffin, Dec 12, 2005.

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  1. John Griffin

    John Griffin Guest

    Something I would like to find: A regulated nine volt power supply
    that has an adapter that fits in the battery compartment and
    provides exactly the same power as a nine volt lithium battery
    without enriching the energizer bunny folks. Is there such a

    I can make the battery compartment insert if I can get the right
    power on a pair of wires or terminals, but I'd rather find the
    package if it exists.

    (Yes, I know about recharging, and yes, I forget to do it.)
  2. Bob Monsen

    Bob Monsen Guest

    <hates polluting the environment with used primary batteries>

    You can buy battery snaps that connect to a standard 9V battery terminal.
    By connecting this to a regulated 9V AC adapter, you have your result.

    The regulated wall-adapter is easy. Here is the first one I found with

    Or, you could simply build one yourself using a non-regulated 12V

    You will need to build the interface between them, such as it is.

    I have a logitech wireless keyboard that eats batteries like popcorn. It
    doesn't work on rechargeable AA batteries, probably due to some voltage
    requirement (primary cells are >1.5V when new, whereas secondary cells
    are nominal 1.2V). So, I bought a surplus 8.4V liion battery, built a
    little regulator circuit, and two cells + the regulator fit into a cute
    little box hanging off the keyboard. However, even with this, it still
    sucked (just not batteries) so I gave up using it. It would lose
    synchronization with the mothership, and you had to take the batteries
    out, hold down the keys for 30 seconds, put the batteries back in, hold
    the button on the mothership pod for 15 seconds, and push the button on
    the back of the keyboard (as documented on the logitech site... sigh).
    This would happen once a day. My belief was that the microcontroller
    running the keyboard was locking up. Junk.

    Bob Monsen

    The abrupt change from rapport of water ritual to a situation in which
    a newly won water brother might possibly be considering withdrawal or
    discorporation would have thrown him into panic had he not been
    consciously suppressing such disturbance. But he decided that if it
    died now he must die at once also he could not grok it in any other
    wise, not after the giving of water.
  3. Jasen Betts

    Jasen Betts Guest

    I've not seen one - which is odd because regulated 9v power supplies are
    easily found, and the battery terminals aren't hard to get either.
    you may have to that's the route I went.

  4. John Griffin

    John Griffin Guest

    Thanks for the reply!

    I have a feeling that the companies that make those batteries
    have tied up all applicable patents and aggressively pursue in
    court anyone who tries to make such a thing.
  5. John Griffin

    John Griffin Guest

    Thank you! Both of those links were just what I needed, even
    though I hope to find the stuff locally.
    Not me...I'm a klutz. I have no idea how that would work.
    Thanks for that...I've had good performance from a wireless
    mouse, and I've been thinking about getting one of those
    keyboards. I won't!
  6. Rich Grise

    Rich Grise Guest

    These are designed to snap onto a battery, and provide power to the
    circuit. If you're going to connect one of these to a power supply,
    be sure and reverse the red and black leads, because they'll be
    wrong. In other words, the negative of the supply should go to
    the red lead of the battery snap, because that snap will snap
    into the one with the black lead on the equipment side.

    Good Luck!
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