What sort of battery are you using, LiPo? If you’re using a FETS switch for 
your pyro outputs, you’ll need a resistor otherwise you’ll fuse them shut on 
power-up. As you might imagine this creates a very dangerous situation when you 
have charges hooked up.

Judging only off your demographics, your plans for current sound fine, but 
there are other factors to consider too like what voltage is required for your 
emtaches to fire. 3.3v is probably enough for many, but not all. What type of 
“connector” are you referring to? I’m also curious if you’re using barometric 
or accelerometer.

And test, test, test! I’ve seen far too many expensive lawndarts as a result of 
people flying homebrew recovery systems without testing them.


Wilson Alness

From: psas-team-boun...@lists.psas.pdx.edu 
[mailto:psas-team-boun...@lists.psas.pdx.edu] On Behalf Of Aaron Baker
Sent: Thursday, November 10, 2016 2:45 PM
To: psas-team
Subject: [PSAS] Question for amateur rocketers

I'm trying to design a firing circuit for use on an amateur rocket avionics 
board, for deployment of some kind of device during a flight. The primary use 
is probably parachute deployment, but I could imagine other uses like staging. 
I have a couple questions:

-What kind of current would be useful to have? I'm shooting for a couple 
hundred mA at 3.3 V, but that's just a guess. Need to know for my cap and 
transistor choices.
-What kind of connector would people expect to see in that context?

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