Dual VR Conditioner Board V2.1


Dual VR v2.1 Board

Like the dual VR board V2.0 that it replaces, this is a small board with surface mount components that is sold fully assembled. It has two VR differential inputs, two 0-5V square wave outputs, and the power supply connections (ground and either 5V or 12V depending on the version). The V2.1 board still has the same circuit as the V2.0 but has a new form factor. It is smaller and the pads are placed such that they fit a DIP8 pattern. So you can use a DIP8 socket or solder it directly to a proto area or a perforated board. It still has the two mounting holes so you can still solder wires directly to the board.

It also now comes in two versions: the internal and the external versions. The internal version is for those who want to use it in the ECU case and it doesn't have the on-board voltage regulator and needs to be powered by a 5V source. The external version has an on-board voltage regulator and can therefore be powered by a 12V source from the car. However you still need to put it in some sort of enclosure to protect it from the environment.

The thread discussing the board can be found here.

This is the fully populated board. You can see the power supply circuit on the bottom which is populated for the external version; this is not populated for the internal version. The 2 mounting holes can be used to mount the board inside the ECU case or any other case when used outside the ECU.

Dual VR v2.1 Populated Board

Dual VR v2.1 Populated Board (bottom)

The solder pads on each side of the board are for connecting wires or pin headers. The bottom also has labels for each pad to indicate its function. The V+ pad is for either 5V or 12V depending if the board is an internal version (5V) or an external version (12V) and GND is used to connect the board to the power supply ground. The VR1+ and VR1- pads are used to connect the first VR sensor and the Out1 pad is the 0-5V square wave signal generated from the input. The VR2+ and VR2- pads are used to connect the second VR sensor and the Out2 pad is the 0-5V square wave signal generated from the input.

Note that the 12V connection for the external version can be to any supply that provides more than about 5.5V.

The board can also be used with Hall or opto sensors. In that case, the sensor is connected to VR+ only and VR- is left floating (not connected to anything). If the sensor does not generate a voltage (open drain output), a pull up resistor will be needed. The board can be used with either a 5V or a 12V input signal regardless of whether the board is an internal or external version.


The assembled boards are available at US$40 per board for the 5V (internal) version and US$50 per board for the 12V (external version) plus shipping. Shipping for up to 2 boards is US$4.50 in North America and US$7.50 in Europe. This is for regular mail from Canada in a bubble envelop which means there is no tracking, no insurance and no guarantee on the delivery time.
Please note that regular mail service to the US has been quite irregular. The delivery time has been from less than 2 weeks to more than 4 weeks. If this is not acceptable, you can request Xpresspost service which will speed up delivery. Contact me for details and price.

Dual VR V2.1 Board 5V (internal) version US$40 plus shipping

Dual VR V2.1 Board 12V (external) version US$50 plus shipping
12V version not available due to global component shortage

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You can contact me through PM on the forum where my user name is jbelanger, at the msextra forum where my user name is racingmini_mtl or by email.