ElectroDynamics Inc
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    EDR-103 Glow Drivers
      Single Cylinders & Twins
    EDR-105 Battery Monitor
    EDR-106 Pro Servo Reverser
EDR-107ADP Kill Switch
    EDR-108 Pow'R Back'R
    EDR-111 Pow'r Bus Pro
    EDR-117 LiteSys
    EDR-122+ Servo-Slo Plus
    EDR-124 BatMon Lite
    EDR-125 Gear Mg'R
    EDR-126 Gear Saver
    EDR-201 Current Probe
    EDR-203 ServoCiser
    EDR-206 Turbine Driver
    EDR-207L NanoTest
      Buffer-Amplifier Interface

    EDR-102 One-Clik
    EDR-103P Glowlite II
    EDR-107ADP Kill Switch
    SANYO eneloop Packs
    EDR-207L NanoTest
      A123 Tester

Ultra Switch II

    ED-Nano A123 Packs
    SANYO eneloop Packs
    Receiver Packs
    Transmitter Packs


    Switch Harnesses
    Amplifying Buffers
    Charge Cords

Festo Fittings


Heat Shrink Tubing

Ultra Precision Valves

Web Specials

Tech Talk

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Pow'R Bus Pro
EDR-111 Pow'R Bus Pro
Glitch-proof that Radio!

Welcome to
Worry-Free Performance
of your Giant-Size aircraft, Jets and Helicopters!

  • Separated Power Busses isolate servo noise and loads from the Rx!
  • Protects the Rx from stalled servos and power line transients!
  • Optically-Isolated and Amplified Control Signal to servos.
  • Worry-Free operation with many large servos driving heavy loads!
  • As practiced in professional aerospace applications:
    • Uses separate batteries to power the Rx and the flight control servos. Batteries may be of different voltage and capacity:
      • Small & Light for Rx,
      • Big and Hefty for maximum power to servos!
  • Compatible with NiCd, NiMH (4 or 5-cells) and Lithium (with voltage regulator) batteries

EDR-111 Pow'R Bus Pro

Pow'r Bus Pro -- $79.95

Complete with all wiring and connectors, ready-to-go!

Frequently Asked Questions

  1. What is Optical Isolation? What is the difference from an optically-isolated and non-optically isolated power bus systems?

    Optical isolation is true and total electrical isolation.
    There is no wiring or conductors shared between the Rx and the servos. [Non-optically-isolated systems use a common electrical ground between the servos and the Rx.]

    The benefits of optical isolation are:

    1. Superior radio interference rejection.
      There is no possibility of conducted interference propagating along a common ground. This is so effective, our EDR-111 and its derivative are employed on NASA research UAV's, and several other University Aerospace department research projects.

    2. Ability to charge both Rx and servo batteries simultaneously from one multi-output charger, or two DC field chargers using the same 12V field battery.

      A common ground often confuses chargers so that one or both batteries does not get a full charge, or worse, damage to the charger or batteries can occur. With a non-optically-isolated system, you have to physically disconnect (i.e., unplug) at least one of batteries before charging, or charge them one-at-a-time. With our EDR-111 there is no such inconvenience or possibility of damage due to "senior moment" error.

  2. Do you make a larger power backer? I'm using a 10-channel radio.

    We do not at this time. However:

    1. Each channel on the Pow'R Back'R is capable of driving up multiple servos thru Y-harnesses (several of our Aerospace flight test customers have used it this way).
      So, for instance, a dual elevator or aileron setup need only use one channel. The EDR-111 is also compatible with "Matchboxes" or "Servo Synchronizers", so than one channel can drive a "Matchbox", which then matches/mixes and drives multiple servos (on a giant-size aerobatic airplane aileron, for example).

    2. You can always add a second Pow'R Back'R in an installation that requires more than 6 channels.
  3. What is the maximum load current the EDR-111 can carry?

    The EDR-111 has a continuous current (all channels combined) capacity of 12 Amps, and a 10-second pulse load capacity of more than 30 Amps.
    For comparison:
    • Standard (26AWG) cable commonly used in RC systems has a max. current capacity of 4 Amps
    • Heavy-Duty (22AWG) cable max. current capacity is 8 Amps.
    • Connector pins on standard servos and batteries are rated at 3 Amps max.
  4. What size batteries can be used with the EDR-111?

    You can use either 4.8V or 6V batteries on the EDR-111.
    There is no limit on the capacity of the batteries.

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Orders: 1-800-337-1638; Info: (734) 422-5420; Fax: (734) 422-5338
31091 Schoolcraft Road; GAZ Commercial Center; Livonia, MI 48150