The question comes up on the forums:
"How do I make my own launch controller?"
From Wayne Hill's Rocketry Blog HERE
I saw the Make Magazine LaunchIt Controller HERE
Your lead lines clip on speaker terminals.
For continuity, this one has a LED light and buzzer.
John Baichtal designed it and adds:
"If you don't have access to a laser, don't fret! You can totally use a commercial project enclosure (Jameco P/N 18906 is somewhat similar in size) or plastic storage box, or even a cardboard box instead."
A cardboard box wouldn't be my first choice. I'd prefer an metal case like the old Centuri Professional controllers. There seem to be plenty available online.
Still, this DIY controller is a fun project for LPR launching.
I know very little about electronics, be sure this one wouldn't prematurely fire a low current igniter like the Quest Q2G2. The controller has the LED continuity light so it should be OK.
DESIGNED FOR USE WITH THE QUEST 9V LAUNCH CONTROLLER - Please note that since they are very low current igniters (150mA No - Fire current), some model rocket launch controllers can set them off during continuity tests. Be sure to test your model rocket launch controller, by connecting an igniter to your controller before inserting it into the model rocket engine to make sure it does not prematurely activate when you insert your safety key and/or when you perform a continuity check.
ReplyDeleteTECHNICAL SPECIFICATIONS: No-Fire Current = 150mA, All-Fire Current = 350mA
So at the clips ...set your Volt Ohm meter to mah....connect to each lead and check the mah draw when the controller is testing the continuity.....do this with fresh batteries....If over the no fire current of the Q2....do not use it!