Yeah ,that's great ! I will try it tonight .
Geeetech use IRF3205 instead of IRLB8743PBF which bobc use in issueB , I checked the datasheet of two MOSFET .
[attachment 25923 3205.jpg]
For IRF3205 Vgs = 3.3V Ids is around 6A or less (see the picture above)
[attachment 25924 8743.jpg]
For IRL8743PBF Vgs = 3.3 Ids is around 20A or above
And I have check the current of my little j-head ,is 2A ,that mean THEORETICALLY direct driver is work for me with the geeetech board ... so ,good luck for me .....(:P)
BY the way I controll the heat bed with relay ,so direct driver is worked ...
Geeetech use IRF3205 instead of IRLB8743PBF which bobc use in issueB , I checked the datasheet of two MOSFET .
[attachment 25923 3205.jpg]
For IRF3205 Vgs = 3.3V Ids is around 6A or less (see the picture above)
[attachment 25924 8743.jpg]
For IRL8743PBF Vgs = 3.3 Ids is around 20A or above
And I have check the current of my little j-head ,is 2A ,that mean THEORETICALLY direct driver is work for me with the geeetech board ... so ,good luck for me .....(:P)
BY the way I controll the heat bed with relay ,so direct driver is worked ...