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  1. #26

    Join Date
    Nov 2010
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    ATHENS, GREECE
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    RE: RCEXL Opto Kill Switch Ignition vs. receiver Voltage Question

    Hi,
    i have the same issue with Frsky D8R II RX , the engine runs fine with the killswitch on but the tachometer keeps rebooting...........i ll try to put a signal booster on the throttle kill channel and see what happens......

  2. #27

    Join Date
    May 2003
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    Ocean Pines, MD
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    RE: RCEXL Opto Kill Switch Ignition vs. receiver Voltage Question

    I have read this thread, use 6 vdc Rx pack and 4.8 vdc ignition pack and do not use opto kill switches, but use a small servo operated switch that is very compact, cheap and totally isolated since it has no connection to either power source, other than the servo is driven by the Rx's 6 vdc. My switches are made using a reed relay, actuated by a very small (1/8" dia x 1/4") rare earth magnet glued in a servo wheel. The reed relay is epoxied in a short piece of soda straw after leads are attached. The whole affair is then glued to the top of a small servo. These tiny reed relays will typically switch 2 A or more and are very small ( 1 or 2 mm in dia) and are good for 100,000's of cycles, are very vibration tolerant AND they are cheap. Picture of a completed assembly below My radio allows setting a failsafe, so I set it to open the reed relay and disconnect ignition power if RX loses signal.

    I was considering using opto switches, but after reading this thread, I don't think so. My deal is very inexpensive and bulletproof. It also has the advantage of drawing no power when the RX is powered down, so it could be used as a shutdown switch for the ignition, but I have chosen to use a separate physical switch for that function.
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    Jim


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