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+
+# Versions of the Huvud Toolboard
+
+
+
+
+
+![Render of Huvud v.050](huvud05render.jpg)
+
+## 0.50
+
+Volume production about to start
+
++ Changed the power connector from a 2x1 Molex Micro-fit to a 2x2. The 2 extra pins are used for CAN bus. Allows one single connector back to klippy.
+* Removed the 4 pin CAN connector
+* Added ESD protection on the CAN bus
++ Test pads on the bottom for production testing
+
+
+# Prototypes
+
+![Pre production version](preversions.jpg)
+
+
+## 0.3
+
+First Version
+
+* 4.7k thermistor pullup
+* 0.100ohm sense resistor for the TMC2209
++ It works!!!
+- External 3.3V voltage regulator
+- No USB, has to be flashed with an ST-LINK
+- Very noisy thermistor signal (only seen when measuring, still works good in klipper)
+* No SMDs smaller than 0603
+
+
+## 0.4
+
++ USB
++ On board 3.3V voltage regulator 
++ 110ohm sense resistor
+
+## 0.41
+
+* 2.2k thermistor pullup to allow the use of PT1000 temperature proble
+* Smaller size. 42x42 mm with 31x31 mm screw pattern, matches NEMA 17.
+* Most small SMDs are 0402
+* Most connectors changed to JST-PH 2.0 mm
+* ESD protection on endstop and thermistor
+- Weak heater MOSFET (max 4A with no margins at all)
+- Forgot the pins for BOOT1, it's not possible to enter the bootloader
+
+
+## 0.44
+
++ Greatly reduced ripple on 3.3V by redesigning and changing to a different voltage regulator IC
++ Greatly reduced thermistor noise, proper filtering of VREF