We're using a single-cell LiPo, and using a FET to control. A
current-limiting resistor is gonna be in there!

By "connector" I mean the electrical connector on the board with which we
can attach leads to the igniter. I was thinking a JST connector or
something but there's probably a better way. Right now we're planning on
using accelerometer to control.

Point very well taken on testing!

Thanks Wilson!

On Thu, Nov 10, 2016 at 2:52 PM Wilson Alness <w...@wilsonalness.com> wrote:

> 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.
>
>
>
> Cheers,
>
> Wilson
>
>
>
> Wilson Alness
>
> www.wilsonalness.com
>
> w...@wilsonalness.com
>
> 503-901-6515 <(503)%20901-6515>
>
>
>
> *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?
>
>
>
> Thanks,
>
> Aaron
>
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