MOTM

From: <groovyshaman@...>
To: "motm group" <motm@yahoogroups.com>
Sent: Saturday, October 16, 2004 10:05 AM
Subject: [motm] adding 5V power to existing system


>
> I wanted to confirm a few things:
>
> 1)
> pin 1 = +15
> pin 2 = GND
> pin 3 = GND
> pin 4 = -15
> pin 5 = digital GND
> pin 6 = +5V
>
> is the correct spec for the new MTA-156 power connector.
>
> 2) I have two supplies, a 5V and a +-15V. The grounds of the two supplies
> should be connected together as close to the supplies as possible.
>
> 3) 12AWG or 14AWG?
>
> 4) Once completed, crack open beer.
>
> ??
>
> George
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>

From: "J. Larry Hendry" <jlarryh@...>
To: "motm group" <motm@yahoogroups.com>
Sent: Saturday, October 16, 2004 11:42 AM
Subject: Re: [motm] adding 5V power to existing system


>
> ----- Original Message -----
> From: Paul Schreiber <synth1@...>
> Correct all down the line. Especially the beer part.
> Paul S.
>
> From: J. Larry Hendry <jlarryh@...>
> I'm going to add a couple of comments:
>
> There is little difference between 12 and 14 AWG. I used 12 where I
could
> get what I wanted and 14 where I had to. In the 5 row cabinet shown at
> AHMW, one supply was used to feed all distribution boards. Voltage drop
to
> the most distant distribution PCB = 0.01 volts.
>
> For triple voltage supplies run two ground wires from the PCB to the
power
> supply common connection -- one from the already common on the PCB 15V
> grounds and a separate wire from the digital ground. I hate calling
these
> grounds. To me they are neutrals (sometimes called common on the power
> supplies). Whatever you call the wire, you need 2 of them, connected
> together at the power supply end and NOT at the PCB end.
>
> If you have separate supplies, bond the cases, and connect both cases to
> earth ground only of the incoming AC cable. This is separate from any
and
> all DC grounds.
>
> I will add power supply wiring to my "order of the universe" list. I
> learned these in life (mostly by screwing them up):
>
> Life planning rule:
> Correct order:
> 1. School
> 2. Marriage
> 3. Babies
> Incorrect order:
> all others
>
> House buying property rule:
> Correct order:
> 1. Road
> 2. House
> 3. Creek
> Incorrect order (my house):
> 1. Road
> 2. Creek (with bridge)
> 3. House
>
> Power supplies:
> Correct order:
> 1. wiring
> 2. testing
> 3. beer
> Incorrect order:
> beer first
>
> Larry, still just a Stooge who got his most recent college degree while
his
> kids were already in college.
>
> ----- Original Message -----
> From: <groovyshaman@...>
> To: "motm group" <motm@yahoogroups.com>
> Sent: Saturday, October 16, 2004 10:05 AM
> Subject: [motm] adding 5V power to existing system
>
> >
> > I wanted to confirm a few things:
> >
> > 1)
> > pin 1 = +15
> > pin 2 = GND
> > pin 3 = GND
> > pin 4 = -15
> > pin 5 = digital GND
> > pin 6 = +5V
> >
> > is the correct spec for the new MTA-156 power connector.
> >
> > 2) I have two supplies, a 5V and a +-15V. The grounds of the two
supplies
> > should be connected together as close to the supplies as possible.
> >
> > 3) 12AWG or 14AWG?
> >
> > 4) Once completed, crack open beer.
> >
> > ??
> >
> > George