I personally like RCS's Low Cost Head End Initiator. It has a No Fire of
1.5Amps, 1.125 watts for 5 minutes, Min fire of 3 amps for 5 seconds and an
all fire current of greater than 5 amps for 100 milliseconds This is on the
heavier side of things, but I am very confident that some electrostatic
discharge isn't going to set it off. However, I would perhaps go slightly
under this just a bit as it is a bit limiting in the electronics it works
with.
On Tue, Jan 5, 2021 at 1:39 PM JAMES ROSSON <jmrosson@xxxxxxx> wrote:
Only two standards I remember from my initiator research: Military, and
Pyrotechnics.
Off my top of head: Pyrotechnics display firing systems tend to be
designed around a 300ma no-fire, and 600-750ma all fire 12v specifications
for "low power" electric matches. High power electric matches, required
1A/1OHM all fire.
There was a study in journal "Selected Pyrotechnic Publications of K.L.
and B.J. Kosanke":
Studies of Electric Match Sensitiveness, you might find interesting.
NASA standard initiator uses: 1A/1W no-fire and 3.5A all fire, with 1.0
ohm bridge wire.
In my studies, the NASA standard is quasi-defacto electrical standard for
missile and space applications regardless of initiator design or program
(though you can find small missile exceptions).
Last but not least:
The lowly blasting cap is generally 1.5-2 ohms and has 1A per cap
requirement for all fire.
PS -Don't forget about coupled RF voltage initiation.
Hope this helps.
Jim Rosson
On January 5, 2021 at 2:47 PM Dr Edward Jones <RocketPioneer@xxxxxxxxx>wrote:
Are there 'best practices' or usual standards for NO-fire and
SURE-fire power for amateur solid rockets? I'm developing some
atypical bridgewires. Thanks.
Edward in Socorro