nuckollsr(at)cox.net
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 Posted: Mon Feb 12, 2007 9:15 am Post subject: Attaching Shield to "Lo"/Ground Wire at Intercom (With COR |
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At 10:34 AM 2/12/2007 -0600, you wrote:
<nuckollsr(at)cox.net>
At 08:44 PM 2/10/2007 -0600, you wrote:
The installation instructions for my PS Engineering PM1000II intercom show
all shields for the mics and phones grounded to their corresponding "Lo"
wires. I've looked at Bob's comic books and searched the collection of
FAQs and couldn't find a way to do it. The wires will be crimped onto
D-SUB pins so there is only room for one wire.
(For intercom installation wiring diagram, see
<http://www.ps-engineering.com/docs/pm1000wiring_data.shtml>http://www.ps-engineering.com/docs/pm1000wiring_data.shtml)
Can I "daisy chain" the shields as Bob shows in his "Shield Termination
Techniques" comic book and ground them all to Ground Pin 1 (which goes to
the "forest-of-tabs" ground block) rather than at each individual "Lo" wire
pin?
Or should each shield be individually grounded to its corresponding "Lo"
wire? It seems I could create an uninsulated length (~0.3 in) before the
end of the "Lo" wire and lightly solder the shield directly to the "Lo"
wire, cover it with heatshrink and then crimp my D-Sub pin to the end of
the "Lo" wire and insert it into the connector.
The diagram cited at:
http://www.ps-engineering.com/docs/PM1000_wiring_11922.pdf
is pretty busy. Virtually all of the shielded wires
depicted can be reduced by one conductor inside the
shield by using the shield as a signal conductor. For
example, the AUX Headphone jack wired to pins 17 and
4 can be handled on a single shielded wire. Use the
shield to provide continuity from pin 4 to the LO side
of the headphone jack.
This philosophy is illustrated in the wiring diagram
pages of:
http://www.aeroelectric.com/DIY/Audio_Isolation_Amplifier.pdf
See:
http://aeroelectric.com/articles/pigtail/pigtail.html
for techniques used to attach one or more shields
into a single wire and termination into a connector
pin. By the way, the shield pigtails comic book cited
above has been updated to fix broken links.
Bob . . .
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( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
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--
6:50 PM
-- incoming mail is certified Virus Free.
Checked by AVG.
Bob . . .
----------------------------------------
( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
----------------------------------------
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