Re: Launcher relay question

Bob Kaplow wrote: 
In article <11smde4tpf1g215@xxxxxxxxxxxxxxxxxx>, the notorious t-e-d <tdstr@xxxxxxxxxxxxxxx> writes:

Ok, I'm just about to start the build on a 12v relay launcher and I'm running into trouble. In particular the relay unit. I've checked damn everywhere locally and have not been able to locate a suitable 12v SPDT relay. Found plenty of 12v SPST relay units but no SPDT units. I've checked several auto stores and surplus stores to no avail. I ended up buying a 12v 30 amp SPST relay at rat shack and I have no doubt it'll work just fine but I'd *really* like the feature of a continuity check. 


I just took apart my old (late 80s?) relay box. It has such a relay. It's
labeled Auto Spec TW-3415. But a web search doesn't find any references.

I did a search on "RELAY 12V 30A SPDT" and got a LOT of hits, including
http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=330-070. I'd
start looking locally at car stereo shops, which is where I think mine came
from.

While my relay design uses a SPDT to drop the continuity check when I
launch, I don't see why it wouldn't work with a SPST relay that just
bypasses the piezo buzzer the same way the Questes launchers bypass the
light bulb when you launch.


Well what do I know....I found the EXACT same relay at a local electronics surplus store that a local flyer clued me in on. Too bad I didn't pick that relay when I was there earlier today :(

Regardless, a beeg fat thanx to all who posted on this thread!

Wait a minute.... there's a rocketry related thread on rmr???

:)

Ted Novak
TRA#5512
IEAS#75
.

Relevant Pages

  • Re: Launcher relay question
    ... In particular the relay unit. ... I've checked damn everywhere locally and have not been able to locate a suitable 12v SPDT relay. ... I've checked several auto stores and surplus stores to no avail. ... light bulb when you launch. ...
    (rec.models.rockets)
  • Re: Launcher relay question
    ... not sure why you couldnt find a SPDT relay. ... everywhere locally and have not been able to locate a suitable 12v SPDT ... Found plenty of 12v SPST relay units but no SPDT units. ... bypasses the piezo buzzer the same way the Questes launchers bypass the ...
    (rec.models.rockets)
  • Re: 12 volt Home electrical system?
    ... The relay then latches magnetically and needs no more input power. ... The switches also went bad, ... I didn't know they made SPDT doorbell buttons. ... The switches, actually breakers, were far from the rooms. ...
    (alt.home.repair)
  • Re: Launcher relay question
    ... If you cannot find the SPDT relay, you can always spring for a DPDT. ... In particular the relay unit. ... Found plenty of 12v SPST relay units but no SPDT units. ...
    (rec.models.rockets)
  • Re: Launcher relay question
    ... In particular the relay unit. ... Found plenty of 12v SPST relay units but no SPDT units. ... light bulb when you launch. ...
    (rec.models.rockets)