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type of diode/protection

Discussion in 'General Electronics Discussion' started by david watters, Nov 5, 2015.

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  1. david watters

    david watters

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    Nov 5, 2015
    im trying to figure out what type of diode or type of protection to use for my setup. im switching my sons baby swing over to dc power with a wall wart and a buck converter and that works great so far but my wife also wants to keep the ability to use the batteries. what can i use on the battery pack to keep it safe in case she forgets to unplug the adapter lol.

    edit: its all running on 6 volts
     
  2. davenn

    davenn Moderator

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    Sep 5, 2009
    Hi David
    welcome to EP :)

    6V and what current ?
     
  3. david watters

    david watters

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    Nov 5, 2015
    thank you i cant believe i havent found this forum before

    4 d cells worth lol one second and ill get a measurement
    the meter set at 10amp i get spikes up to .6 but sits at .02 once up to speed
     
    Last edited: Nov 5, 2015
  4. hevans1944

    hevans1944 Hop - AC8NS

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    Jun 21, 2012
    Perhaps you could wire in a simple DPDT toggle switch with a center-off position (ON-OFF-ON). Common terminals wired to swing motor, contact terminals wired to battery pack on one side and to wall wart supply on the other side.
     
  5. david watters

    david watters

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    Nov 5, 2015
    ya thats my plan if i cant figure out some other way to auto switch it lol
     
  6. AnalogKid

    AnalogKid

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    Jun 10, 2015
    A SPDT relay with a 6 Vdc coil. Power the coil off whichever source you want to power things when both sources are connected (we'll call it the primary). When the primary source is removed, the relay will drop out and whatever is connected to the NC contact will run things until the primary comes back.

    NC - secondary power source
    NO - primary power source
    Common - output to device.

    ak
     
  7. hevans1944

    hevans1944 Hop - AC8NS

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    Jun 21, 2012
    I suppose a rectifier diode (1N400x family) inserted in series with each supply, with the anode of each diode on the positive terminal and the cathodes tied together and connected to the swing motor would also work... at the expense of one diode forward drop (about 0.7 volts) decreasing the voltage to the motor.
    That's why I suggested the mechanical switch: no losses. But if you want automagical switching try the diodes.
     
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