REFLECTOR: Switching Grounds

[Jim Agnew]

Many electronics (e.g., coms, navs, GPS, etc.) use ground
referenced switching so it makes sense to be consistent.

My stick contains pilot & co-pilot PTT, com swap, Xponder
Ident, and 4 way trim and uses only one ground wire for all
of the switches.  The trim motors use relays so the current
drains are minimal and allow a 22ga ground wire and 24 ga
switch wires so the stick bundle is very small.

Jim


--- Douglas Holub <doug.holub at comcast.net> wrote:

> If you switch the positive wires, when the switches are
> off, there are fewer live wires. That can only be good.
>   ----- Original Message ----- 
>   From: Randy Wharton 
>   To: reflector at tvbf.org 
>   Sent: Sunday, September 12, 2004 5:11 PM
>   Subject: REFLECTOR: Switching Grounds
> 
> 
>   Not too long ago, someone mentioned that they ran
> ground wires to their switches instead of switching the
> positive lead because they thought it was safer? Not sure
> if I recollect exactly. But I don't remember anyone
> contradicting the idea. Would there really be any
> advantage in doing that? Because the switch provides that
> break in a circuit so that current stops flowing across
> it. When the switch is open, on side of the switch will
> be at the positive potential, and the other side will be
> at ground potential (in a power circuit.) So I fail to
> see any difference from the switch's perspective whether
> you have the switch on the hot side or the ground side of
> the load. 
> 
>    
> 
>   Randy Wharton
> 
>   N248RB - Velocity XL-RG
> 
>   http://clik.to/velocity
> 
>    
> 
> 
> 
>
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=====
James F. Agnew
Jim_Agnew_2 at Yahoo.Com
Tampa, FL
Velocity 173 Elite Aircraft Completed & Flying