[Elecraft] K3: reverse 12 volt supply

[Charlie T, K3ICH]

Seriously, it makes you wonder how the standard house wiring color code over here in the colonies ever came up with black as the hot wire.
Green for ground makes sense though.

73, Charlie k3ICH



-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Gary
Sent: Tuesday, September 15, 2015 8:46 AM
To: ae4pb at carolinaheli.com; 'Richard Fjeld' <rpfjeld at outlook.com>; 'Fred Townsend' <fptownsend at earthlink.net>; elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3: reverse 12 volt supply

What an interesting idea. Wonder why that has not become a standard?

(grin)

Gary 

-----Original Message-----
From: "ae4pb at carolinaheli.com" <ae4pb at carolinaheli.com>
Sent: ‎15/‎09/‎2015 10:18 PM
To: "'Richard Fjeld'" <rpfjeld at outlook.com>; "'Fred Townsend'" <fptownsend at earthlink.net>; "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] K3: reverse 12 volt supply

I have an idea. Why not color code the wires so we know which one is positive and which one is Ground (or neutral) ? Maybe make the positive lead red (like hot, danger) and the other one anything, black, green... 
Thoughts? 






Notice: The above post is a weak attempt at humor, albiet sarcastic , and is NOT INTENDED TO BE OFFENSIVE IN ANY WAY.

Jerry Moore
AE4PB, K3S SN# TBA later TOMORROW!!

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Richard Fjeld
Sent: Tuesday, September 15, 2015 1:02 AM
To: Fred Townsend; elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3: reverse 12 volt supply

It was a passing thought as;  how to use a diode without causing a voltage drop was the original question.

AD5X has an OVP and Rev Polarity project on his website that would be better.

I couldn't think of the call sign at the time, so I suggested a relay.

(I've worked with huge contactors that were on motor-generators to prevent
run-aways)

73,
Dick, n0ce



On 9/14/2015 5:13 PM, Fred Townsend wrote:
> Dick:
> Relays? Sure, easy to do. Power relays are often used in many kinds 
> equipment. They are sometimes called 'contactors'. They are either big 
> and clunky or small and unreliable. Which kind do you want and what 
> are you willing to pay?
> 73
> Fred, AE6QL
>
>
>

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