View source for VR Conditioner

VR (Variable Reluctance) Conditioners take the semi-sinusoidal signal generated by VR sensors and outputs a (typically) 5v square wave that can be interpreted by modern ECUs. There are many variants, including hardware built into ECUs, add-in boards, and OEM standalone styles. These are not needed for Hall or Optical sensors as those generate square waves natively. 

== Discrete ==
"Discrete" conditioners generally use specific components to build-out a signal filter to generate the needed wave form.

=== uaEFI ===

==== mck1117 vr-interface ====
Built in "discrete" input. Based on the lm1815,  open source

https://github.com/mck1117/vr-interface/tree/master

== MAX9924/9926 ==
Many VR Sensors are based on the ICs created by Analog Devices / Maxim Integrated. 24 is single channel, 26 is dual channel. 

=== uaEFI ===
[[File:MAX9924 Diagram.png|thumb|MAX9924 Circuit Diagram]]Built in 'VR2/Hall' input

== "JDM" Conditioner ==
Typically contains special hardware to handle the "weird" signals of certain Japanese crank sensors common on Toyotas and Hondas. Based on lm393. 

== HEI 7/8 ==
THE HEI 7 OR 8 IGNINTION MODULES WERE MADE BY GM IN THE 90S AND ARE GODS OWN VR CONDITIONER. ALSO KNOWN AS SILVERBACK BANNANA OR JUST USE THIS ONE.

=== HEI 7 ===
Typical use is to use the 12v/ground, VR pins, and only the signal out to condition (Pin R) VR sensors, not the actual ignition modules. The HEI 7 uses spade terminals of ?? size.  

==== Pinout ====
[[File:HEI7 Wiring.png|thumb|Wiring/Circuit diagram for HEI7 ignition module]]

* B - Bypass Mode (used for dwell control, typically unused)
* R - Reference - 5v square wave, hall input on ECU
* E - Dwell control from ECU (typically unused)
* N - VR Sensor Negative - 
* P - VR Sensor Positive +
* + - 12v, Battery (And coil positive if using)
* C - Coil negative (typically unused)
* Ground - The unit is grounded through the mounting screw

==== Part Numbers ====
Reference part number is lx315 and can be found via many sources.

General Motors '''1976908'''

=== HEI 7 ===
Basically the same as the HEI 8 module, except has full connectors and one extra pin for the ground so it is not needed to ground via the mounting screw.

==== Pinout ====
[[File:HEI 8 Module Wiring.png|thumb|HEI 8 Module Wiring]]

* B - Bypass Mode (used for dwell control, typically unused)
* R - Reference - 5v square wave, hall input on ECU
* E - Dwell control from ECU (typically unused)
* N - VR Sensor Negative -
* P - VR Sensor Positive +
* + - 12v, Battery (And coil positive if using)
* C - Coil negative (typically unused)
* Ground - The unit is grounded through the mounting screw

==== Connectors ====
<small><sup>1</sup>/<sub>8</sub></small>" Spades for VR Sensor

The 4-wire connector to MegaSquirt-II can be bought as:

* ''GM:'' 12126487
* ''AC Delco:'' PT757
* ''Motormite:'' 85135
* ''PICO:'' 5602

The two lead connector for the small cap module is the same as the recommended CLT sensor connector:

* ''GM:'' 15306195
* ''AC Delco:'' PT1350
* ''Wells:'' 254
* ''NAPA:'' ECHTSC200
* ''Motormite:'' 85100 <small>(Autozone (PN 047131))</small>

== Speeduino Socket ==
Many modules follow the 'Speeduino' style of pin layout which is a DIP-8 socket format. 
[[File:Speeduino DIP8 VR Conditioner Pinout.png|thumb|Speeduino DIP8 VR Conditioner Pinout]]