Dr_Doggy
Well-Known Member
thanks to all the help iv had, I have recently completed my "roger the robot" running on my cable box remote,
https://www.electro-tech-online.com/members/dr_doggy-albums-roger-robot.html
and more recently i have added a small prototype coilgun to it, which the robot has full control of (when commanded by the remote). I have also programmed in a lockout code so the charger cannot falsely activate.
Originally i used the re-load servo to also act as a fire mechanism, but found that inefficient since the discharge blows out and shortens the contacts, so my next plan is/was to use an s4055p SCR instead, however i read that scr directly to the uC is bad idea, and have found that it sometimes works but struggles, so i tried a 9V, which now fires ok, however now i think i have run in to a problem where the scr has fuzed in a closed state.
Im charging 2x 1000uf450v capacitors to about 3-4 hundred volts, and discharging through a very small coil as seen in the photos. My ammo are #6 3/4long machine screws with the heads cut off. and travel about 20-30ft.
but how should i finish this circuit off? am i overloading the SCR's? would 2 work? maybe a larger coil? also how would I wire in a transistor to trigger from the 9v battery(if thats the best way)?
(plan C is to use a camera flash tube, good idea?)
https://www.electro-tech-online.com/members/dr_doggy-albums-roger-robot.html
and more recently i have added a small prototype coilgun to it, which the robot has full control of (when commanded by the remote). I have also programmed in a lockout code so the charger cannot falsely activate.
Originally i used the re-load servo to also act as a fire mechanism, but found that inefficient since the discharge blows out and shortens the contacts, so my next plan is/was to use an s4055p SCR instead, however i read that scr directly to the uC is bad idea, and have found that it sometimes works but struggles, so i tried a 9V, which now fires ok, however now i think i have run in to a problem where the scr has fuzed in a closed state.
Im charging 2x 1000uf450v capacitors to about 3-4 hundred volts, and discharging through a very small coil as seen in the photos. My ammo are #6 3/4long machine screws with the heads cut off. and travel about 20-30ft.
but how should i finish this circuit off? am i overloading the SCR's? would 2 work? maybe a larger coil? also how would I wire in a transistor to trigger from the 9v battery(if thats the best way)?
(plan C is to use a camera flash tube, good idea?)
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