At 7:53 PM +0100 04/01/01, Hugo Haesaert wrote:
>Hi All !
>
>There are locking DIN connectors that have a different pin out than
>the MIDI ones . Should be a bit cheaper than the xlr's .
They are much cheaper, but DIN can't be connected to an 18AWG wire, and
certainly not 14AWG.
At 1:42 PM -0500 04/01/01, J. Larry Hendry wrote:
>
>Well, the best connection for each module is directly to the power supply
>>in a star type fashion. However, when you get your system up to the 40 +
>module range, this is not practical. So, I put the PCBs closer to the
>modules they serve and run the larger wire to the PCBs. So the current of
>all 12 modules served from that PCB is on the wiring to the power supply.
>OK, so whats the big deal? It might be 400 mA or so per PCB. The wire is
>not sized to the current flow expected. If it were, # 18 would be
>>oversized for everythying.
Good point, but have you seen the size of rest of the system?? :)
>It is sized to eliminate small voltage drops between the
>power supply and the distribution PCB. These unwanted voltage drops cause
>by current draw variations in one module can cause interation with another
>module.
Hmmmm...
>You are comparing apples to oranges. The voltage drop in these AC lines
>really has no negative effect on your gear. Small voltage fluctuations on
>your 15 VDC line do. The AC supply voltage at your main panel routinely
>varies by as much as 3 or 4 volts (more in California) even before
>variations caused by voltage drop is considered. We (power companies, my
>vocation) vary the AC voltage delivered to your house on purpose. US code
>specifies anything between 114 and 126 as acceptable for residential
>service.
This is true, and that's before it's regulated twice.
>4 conductor is getting more common. New code is requiring a
>ground separate from neutral now on many 240 volt appliances (UL
>caught on to the fact that these appliances have 120 volt connections.
Most of the ones I've seen have been solid, not stranded.
>The official MOTM power jumper PCB with 12 MTA156-4 connectors is
>2 1/2" x 4 3/16" by my measurement. I can send you a photo of one if you
>>like.
Thanx!! A measurement is exactly what I needed. Although I don't think a
photo is necessary. Now I have to go measure an outlet box.
>Oh, I forgot to tell you. You ony run three wires fromt he PCB to the
>power supply. Paul made the grounds common at the PCB supply.
>So you only need 3 conductors between the power supply and the MOTM-900
>>PCB. That's another good reason to keep the wire big.
Excellent!!! I think I can find 14AWG/3 stranded without having to chop
down an extension cord (which isn't even an option with four conductors).
You have been very helpful.
THANX!!