Eddy current brake control

YourDyno can perform Eddy current brake control. The dyno below is a YourDyno controlled eddy brake dyno from JDM Dyno Systems.

Below is a more home made setup, also running YourDyno. 

If you have an old eddy current dyno, in many cases you can use your existing power supply. They are controlled using some analog signal or PWM signal. You may connect the power supply’s control signal directly to YourDyno, or at most need to make a small interface to YourDyno. For example, old Bosch eddy current dynos use a 0-10V analog signal. To control those, you just need a simple circuit that converts between a 0-5V signal to a 0-10V signal.

The Eddy current power supply

CAUTION! When working with Eddy current brake control, be aware that high voltages are generated. Take necessary precautions. 

In case you do not have a power supply, here are some options.

First make sure you know the power requirements for your brake. Dyno brakes are already wired with all coils in series, so you can see directly the voltage and current requirements from the spec. Brakes from trucks and buses are wired for either 12V or 24V and will need to be rewired so all coils shall be in series. This will equate to either 96V or 192V for most brakes (each coil is 12V normally). Check the spec to also find the current rating. 

By far the easiest and most straight forward is to use the YourDyno power supply. It is made specifically for YourDyno, has electrical noise filters and is rated for 30 Amps. It includes a Bluetooth module with support for status.

Connecting the power supply to YourDyno

Here is how to connect YourDyno instrument box to the YourDyno power supply. Similar connections apply for other brake supplies. The jumper inside the YourDyno box should be in the default position which is PWM. See this link if you are unsure if you have moved the jumper. 

The power supply is made to run from 220-240VAC and will deliver 0-192V DC. 

See also https://yourdyno.com/yourdyno-eddy-brake-power-supply/













Last updated byJostein on May 24, 2022


  1. Mark Loupis
    October 28, 2019 @ 9:34 pm

    hi just need a bit of help i have a old Mustang emission dyno and the power supply works with a 0-5v signal and there are 3 wires going to the board I-Con , I-Sig & I-Pow how is this wred do i just need 2 wires or use all 3


    • admin
      October 28, 2019 @ 9:54 pm

      I expect i-Con = 0V and I-Sig = signal and I-Pow should be unconnected. But can you post a picture? And better to start a topic in the forum, to see if different people can chip in.


    • Michael
      November 28, 2019 @ 4:30 am

      I also have an older Mustang dyno with the same type of power supply. In talking with the Mustang techs, I was told the signal isn’t 5v analog. It is a special digital 5v communication signal. I confirmed this with my own testing. So I bought the PWS3.2 listed above. Works great! I am using the PWM signal.


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