Cheap and easy speed controllers

[glen]

yes you use 2 microswitches that actuate before pushing in the trigger in place of the mechanical switch. one micro for foward direction one for reverse

the drill triggers current limit at ~15amps and are full variable speed. BUT they are very fiddly to make.

the work well and even if you do blow out the fet which is unlikely you can still use it as a full on off power switch.

ill let aaron chide in here on how to make them and post a photo because my versions are only half built but be warned they are damn tricky to make

yes you use 2 microswitches that actuate before pushing in the trigger in place of the mechanical switch. one micro for foward direction one for reverse

the drill triggers current limit at ~15amps and are full variable speed. BUT they are very fiddly to make.

they work well and even if you do blow out the fet which is unlikely you can still use it as a full on off power switch.

ill let aaron chide in here on how to make them and post a photo because my versions are only half built but be warned they are damn tricky to make

My team mate Andrew was the genius behind using the XU1 variable speed drill triggers for controllers. We didnt actually realise that they were 15amp current limited till we stall tested a set and noticed it wouldnt feed ore then 15-17amps at most.

Something inside the little trigger cuts back the postive voltage to limit current, was quite interesting to play with. Andrew now builds them to fit inside the drill battery case for easy of mounting

[RogueTwoRobots]

Cool, thanx for the replies, Ill see what I can do with mine then (probably melt them into oblivion or something )

Regards
Jamie

[trig]

ive just made my own speedcontroller cost bout £90 (bout 3xs the amount u wanted to spend lenny) and that was with some of the bits already owned. building speed controllers are hard and very time consuming mine was all surface mount tests ya patence tho :P. i now probably have the most complicated speed controller ever in my featherbot :P gotta big up somthing bout me feather.

triggy