[simpits-tech] Circuit Breakers

Thu Dec 4 10:06:25 PST 2008

Probably milliseconds would be fine.

What do I have to protect?....My home.  A fire from a shorted wire I can't
see or notice right away when current is sinking to the chassis is my worry.
The insulation catches fire and spreads and a fun hobby turns into disaster.

Simulated or not, it's good practice to use protection in any chassis
circuitry.  Small shorts, can cause big problems.just ask the astronauts of
Apollo 1 (of course, you'll need a Ouija board :-))  I'm more concerned with
big shorts.

Jay

Show me a man who cannot be bothered to do the little things, and I will
show you a man who cannot be trusted to do the big ones.

--Lawrence Bell, Founder Bell Hellicopter

  _____  

From: simpits-tech-bounces at simpits.org
[mailto:simpits-tech-bounces at simpits.org] On Behalf Of Cris Harrison
Sent: Tuesday, December 02, 2008 12:08 PM
To: Simulator Cockpit tech list
Subject: Re: [simpits-tech] Circuit Breakers

Jay --
you realy have to define fast..  is it seconds, milliseconds, microseconds,
or nanoseconds....
lets start with the fastest..
nanoseconds TTL (gates switch at 2-5 ns. (realy fast) 
microseconds instruction time of a microprocessor.
milliseconds times fuses and circuit breakers pop (it has to heat up)
seconds oh i wish i had a 11 second 1/4mile car :)
so
in old semiconductor amps the joke was the finals blow faster than the
fuses!!
last thought..
most of what you have in the cockpit is SIMULATED! ie what do you have to
protect?
In my cockpit i have control heads which have micros in them and my whole
project is running on 
message passing via Ethernet 
please read more about my projects:
www.phoenixcomm.net/~phnx2000/sim
www.phoenixaerospace.us

Cris Harrison
A simulated crash is the ONLY crash you can walk away from...

On Mon, Nov 3, 2008 at 12:49 PM, Joseph Fagner <crease-guard at sbcglobal.net>
wrote:

Don't really want to blow them remotely, although that a pretty slick idea
with the SCR, I just wanted to use them as a functioning circuit breaker to
protect electronics and what not.

You say they are fast but I have read that they are slow blow type breakers,
which is it?

Jay

Show me a man who cannot be bothered to do the little things, and I will
show you a man who cannot be trusted to do the big ones.

--Lawrence Bell, Founder Bell Hellicopter

  _____  

From: simpits-tech-bounces at simpits.org
[mailto:simpits-tech-bounces at simpits.org] On Behalf Of Cris Harrison
Sent: Monday, November 03, 2008 10:27 AM

To: Simulator Cockpit tech list
Subject: Re: [simpits-tech] Circuit Breakers

RE: Joseph Fanger

joe you can use real CB's but and them blow them remotely with a SCR (see
simptis.wetpaint.com), the CB carrys the load or drive relays
(bah), and dont worry about spikes ALL electro mechanical devices spike but
true aircraft brakers are very fast much faster than your 
house and, i figure if it good enjouh for the AF etc then its good enjough
for me..... 
Cris Harrison
www.phoenixcomm.net/~phnx2000/sim
<http://www.phoenixcomm.net/%7Ephnx2000/sim> 
www.phoenixaerospace.us

On Sun, Nov 2, 2008 at 11:09 PM, Joseph Fagner <crease-guard at sbcglobal.net>
wrote:

Believe it or not, I'm actually at a point now where I can start running
power to the sim.  I seem to recall several years ago this topic but don't
recall the details.  I have several aircraft type circuit breakers (DC
rated) I'd like to use for the DC voltages in the pit (I'll leave the AC
stuff to my house circuits).  Does anyone know if these can safely be used
in this type of application?  Some of you guys with Heavies pits, I know
ya'll use circuit breakers, what configurations are folks using, if any?

Thanks

Jay

Show me a man who cannot be bothered to do the little things, and I will
show you a man who cannot be trusted to do the big ones.

--Lawrence Bell, Founder Bell Hellicopter

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