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  • CHarge vs use battery

    From [email protected]@21:1/5 to All on Fri Mar 17 12:45:45 2023
    How do you use diodes and capapcitors to switch a 4v power supply
    so it continuously charges a battery when not being used.

    I have an hp2621a terminal which had a battery to keep nonvolatile settings
    (eg baud rate, parity &c). I want a chargeable battery to keep those settings going but to charge when I have the machine on.



    Decades ago someone posted how to have a bike generator charge a capcitor so that when you brake, you can power a back red light.


    --
    Vasos Panagiotopoulos panix.com/~vjp2/vasos.htm
    ---{Nothing herein constitutes advice. Everything fully disclaimed.}---

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  • From Peter W.@21:1/5 to All on Fri Mar 17 07:23:27 2023
    I have an hp2621a terminal which had a battery to keep nonvolatile settings (eg baud rate, parity &c). I want a chargeable battery to keep those settings going but to charge when I have the machine on.

    The issue that comes to mind is whether a/the power-supply would cause problems if connected to the terminal with or without the battery. If not, would an appropriate Zener diode do the trick?

    Peter Wieck
    Melrose Park, PA

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  • From [email protected]@21:1/5 to All on Fri Mar 17 19:13:44 2023
    In <[email protected]> by Peter W. <[email protected]> on Fri, 17 Mar 2023 10:23:27 we perused:
    I have an hp2621a terminal which had a battery to keep nonvolatile settings
    (eg baud rate, parity &c). I want a chargeable battery to keep those settings
    going but to charge when I have the machine on.

    *+-The issue that comes to mind is whether a/the power-supply would cause problems if connected to the terminal with or without the battery. If not, would an appropriate Zener diode do the trick?

    Thanks..

    THough I also realise I could get two batteries, use one, charge the other..

    But I suspect it will not fit exactly so I need to solder it

    --
    Vasos Panagiotopoulos panix.com/~vjp2/vasos.htm
    ---{Nothing herein constitutes advice. Everything fully disclaimed.}---

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Charles Lucas@21:1/5 to [email protected] on Sat Mar 18 10:41:02 2023
    On Friday, March 17, 2023 at 2:13:50 PM UTC-5, [email protected] wrote:
    In <[email protected]> by Peter W. <[email protected]> on Fri, 17 Mar 2023 10:23:27 we perused:
    I have an hp2621a terminal which had a battery to keep nonvolatile settings
    (eg baud rate, parity &c). I want a chargeable battery to keep those settings
    going but to charge when I have the machine on.

    *+-The issue that comes to mind is whether a/the power-supply would cause problems if connected to the terminal with or without the battery. If not, would an appropriate Zener diode do the trick?

    Thanks..

    THough I also realise I could get two batteries, use one, charge the other..

    But I suspect it will not fit exactly so I need to solder it
    --
    Vasos Panagiotopoulos panix.com/~vjp2/vasos.htm
    ---{Nothing herein constitutes advice. Everything fully disclaimed.}---

    Just another point, although it is basic- Be extremely careful when you do solder!
    HEAT from any source including soldering can create adverse conditions or effects. If you have multiple batteries, gang them in a wrap with the contact points
    exposed at either end (if the batteries are stacked) in order to minimize the points
    at which you solder. Also, solder momentarily in a relative sense. That way, you
    minimize contact time, still perform the task, and get an effective connection that
    will adhere in the process. Whatever you do, be extremely aware and be very careful. There is some risk involved in doing this and wear eye protection.

    Best wishes.


    Charles Lucas

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  • From HW@21:1/5 to [email protected] on Sun Mar 19 00:28:42 2023
    On Fri, 17 Mar 2023 12:45:45 -0000 (UTC),
    [email protected] wrote:

    How do you use diodes and capapcitors to switch a 4v power supply
    so it continuously charges a battery when not being used.

    First, you must specify what type of battery chemistry we are talking
    about. But I can't imagine doing it with just diodes and capacitors.

    keep nonvolatile settings

    Depending on your specific application, a super capacitor might be an
    option?

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