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flyer532(at)gmail.com
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 Posted: Mon Feb 08, 2021 6:49 am Post subject: Molex vs bus bar |
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Need some thoughts from you guys. I am installing 8 Mitchell products cluster gauges in a 1978 PA32-300 (fuel qty, oil press, oil tem, etc). I am wondering if there are any disadvantages to using a molex 8 pin connector with one side having the 8 power wires connected to it and the other side with the single 20 AWG power wire to one pin location and then use jumping wires to connect in series the other remaining pins so as to power the entire set of 8 gauge clusters. Each cluster draws 1/10th amp and 20 AWG wire is attached to the existing 5A Inst Gauge C/B. The other alternative would be to use a bus bar but I am very limited in locating a good place to attach a bar. Could I also do the same for the grounding wires, i.e. 8 ground wires to one side of the molex connector and other side with a single grounding wire with jumped pins. The single ground wire (size?) would be grounded to the frame. The entire installation will be receiving a 337 field approval. Thoughts?
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Ceengland
Joined: 11 Oct 2020
Posts: 380
Location: MS
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| Posted: Mon Feb 08, 2021 8:22 am Post subject: Molex vs bus bar |
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On 2/8/2021 8:48 AM, Daryl Thompson wrote:
| Quote: | Need some thoughts from you guys. I am installing 8 Mitchell products
cluster gauges in a 1978 PA32-300 (fuel qty, oil press, oil tem, etc).
I am wondering if there are any disadvantages to using a molex 8 pin
connector with one side having the 8 power wires connected to it and
the other side with the single 20 AWG power wire to one pin location
and then use jumping wires to connect in series the other
remaining pins so as to power the entire set of 8 gauge clusters. Each
cluster draws 1/10th amp and 20 AWG wire is attached to the existing
5A Inst Gauge C/B. The other alternative would be to use a bus bar
but I am very limited in locating a good place to attach a bar. Could
I also do the same for the grounding wires, i.e. 8 ground wires to one
side of the molex connector and other side with a single grounding
wire with jumped pins. The single ground wire (size?) would be
grounded to the frame. The entire installation will be receiving a 337
field approval. Thoughts?
The architecture sounds reasonable to me, but my personal choice of
|
hardware would not be molex. I was an electronics tech in several past
lives, and saw a *lot* of reliability issues with them, in a lot of
different environments. In addition, jumping that many pins would be as
big a pain as just jumping from instrument to instrument in the
'traditional' fashion of wiring instruments.
My choice of hardware would be Dsub. The airframe side of the connector
could be a molded solder cup style, allowing you to bridge an entire
line of pins with a single bared wire for B+, and the same on the other
line for ground. A 25 pin connector would likely take less real estate
than a 16 pin molex. The instrument side of the connector could be the
removable pin type of connector, making it easy to add additional power
wires for each instrument. Similar idea to the 'panel ground bus'
detailed in the AEC drawings, but with one row being the supply instead
of ground.
FWIW,
Charlie
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Charlie |
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flyer532(at)gmail.com
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| Posted: Mon Feb 08, 2021 8:58 am Post subject: Molex vs bus bar |
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Awesome idea! Thank you sir! Any recommendations on the best place to buy the d subs?
On Mon, Feb 8, 2021 at 11:27 AM Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
| Quote: | --> AeroElectric-List message posted by: Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)>
On 2/8/2021 8:48 AM, Daryl Thompson wrote:
> Need some thoughts from you guys. I am installing 8 Mitchell products
> cluster gauges in a 1978 PA32-300 (fuel qty, oil press, oil tem, etc).
> I am wondering if there are any disadvantages to using a molex 8 pin
> connector with one side having the 8 power wires connected to it and
> the other side with the single 20 AWG power wire to one pin location
> and then use jumping wires to connect in series the other
> remaining pins so as to power the entire set of 8 gauge clusters. Each
> cluster draws 1/10th amp and 20 AWG wire is attached to the existing
> 5A Inst Gauge C/B. The other alternative would be to use a bus bar
> but I am very limited in locating a good place to attach a bar. Could
> I also do the same for the grounding wires, i.e. 8 ground wires to one
> side of the molex connector and other side with a single grounding
> wire with jumped pins. The single ground wire (size?) would be
> grounded to the frame. The entire installation will be receiving a 337
> field approval. Thoughts?
The architecture sounds reasonable to me, but my personal choice of
hardware would not be molex. I was an electronics tech in several past
lives, and saw a *lot* of reliability issues with them, in a lot of
different environments. In addition, jumping that many pins would be as
big a pain as just jumping from instrument to instrument in the
'traditional' fashion of wiring instruments.
My choice of hardware would be Dsub. The airframe side of the connector
could be a molded solder cup style, allowing you to bridge an entire
line of pins with a single bared wire for B+, and the same on the other
line for ground. A 25 pin connector would likely take less real estate
than a 16 pin molex. The instrument side of the connector could be the
removable pin type of connector, making it easy to add additional power
wires for each instrument. Similar idea to the 'panel ground bus'
detailed in the AEC drawings, but with one row being the supply instead
of ground.
FWIW,
Charlie
--
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Ceengland
Joined: 11 Oct 2020
Posts: 380
Location: MS
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| Posted: Mon Feb 08, 2021 10:00 am Post subject: Molex vs bus bar |
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They're sold by just about every vendor that handles electronic components, so it's hard to recommend just one. For the individual crimp pin type, B&C would be a great choice.
https://bandc.com/product-category/electrical-supplies/d-sub-audio-connectors/
For solder style (and crimp, as well), just about any of the 'usual suspects'. Newark, Mouser, Digi-Key, Allied, etc. The highest quality individual pins are like the ones B&C sells; known as 'machined pins', that have gold plated contact surfaces. Some (not all) of the solder type connectors will have gold plated contact surfaces, as well. Just search their sites for 'Dsub' and 'DB25' (for a 25 pin version).
Charlie
On Mon, Feb 8, 2021 at 11:06 AM Daryl Thompson <flyer532(at)gmail.com (flyer532(at)gmail.com)> wrote:
| Quote: | Awesome idea! Thank you sir! Any recommendations on the best place to buy the d subs?
On Mon, Feb 8, 2021 at 11:27 AM Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
| Quote: | --> AeroElectric-List message posted by: Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)>
On 2/8/2021 8:48 AM, Daryl Thompson wrote:
> Need some thoughts from you guys. I am installing 8 Mitchell products
> cluster gauges in a 1978 PA32-300 (fuel qty, oil press, oil tem, etc).
> I am wondering if there are any disadvantages to using a molex 8 pin
> connector with one side having the 8 power wires connected to it and
> the other side with the single 20 AWG power wire to one pin location
> and then use jumping wires to connect in series the other
> remaining pins so as to power the entire set of 8 gauge clusters. Each
> cluster draws 1/10th amp and 20 AWG wire is attached to the existing
> 5A Inst Gauge C/B. The other alternative would be to use a bus bar
> but I am very limited in locating a good place to attach a bar. Could
> I also do the same for the grounding wires, i.e. 8 ground wires to one
> side of the molex connector and other side with a single grounding
> wire with jumped pins. The single ground wire (size?) would be
> grounded to the frame. The entire installation will be receiving a 337
> field approval. Thoughts?
The architecture sounds reasonable to me, but my personal choice of
hardware would not be molex. I was an electronics tech in several past
lives, and saw a *lot* of reliability issues with them, in a lot of
different environments. In addition, jumping that many pins would be as
big a pain as just jumping from instrument to instrument in the
'traditional' fashion of wiring instruments.
My choice of hardware would be Dsub. The airframe side of the connector
could be a molded solder cup style, allowing you to bridge an entire
line of pins with a single bared wire for B+, and the same on the other
line for ground. A 25 pin connector would likely take less real estate
than a 16 pin molex. The instrument side of the connector could be the
removable pin type of connector, making it easy to add additional power
wires for each instrument. Similar idea to the 'panel ground bus'
detailed in the AEC drawings, but with one row being the supply instead
of ground.
FWIW,
Charlie
--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
===========
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Electric-List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
===========
FORUMS -
eferrer" target="_blank">http://forums.matronics.com
===========
WIKI -
errer" target="_blank">http://wiki.matronics.com
===========
b Site -
-Matt Dralle, List Admin.
rel="noreferrer" target="_blank">http://www.matronics.com/contribution
===========
|
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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Charlie |
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flyer532(at)gmail.com
Guest
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| Posted: Mon Feb 08, 2021 10:19 am Post subject: Molex vs bus bar |
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Ok thanks Charlie
On Mon, Feb 8, 2021 at 1:11 PM Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
| Quote: | They're sold by just about every vendor that handles electronic components, so it's hard to recommend just one. For the individual crimp pin type, B&C would be a great choice.
https://bandc.com/product-category/electrical-supplies/d-sub-audio-connectors/
For solder style (and crimp, as well), just about any of the 'usual suspects'. Newark, Mouser, Digi-Key, Allied, etc. The highest quality individual pins are like the ones B&C sells; known as 'machined pins', that have gold plated contact surfaces. Some (not all) of the solder type connectors will have gold plated contact surfaces, as well. Just search their sites for 'Dsub' and 'DB25' (for a 25 pin version).
Charlie
On Mon, Feb 8, 2021 at 11:06 AM Daryl Thompson <flyer532(at)gmail.com (flyer532(at)gmail.com)> wrote:
| Quote: | Awesome idea! Thank you sir! Any recommendations on the best place to buy the d subs?
On Mon, Feb 8, 2021 at 11:27 AM Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
| Quote: | --> AeroElectric-List message posted by: Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)>
On 2/8/2021 8:48 AM, Daryl Thompson wrote:
> Need some thoughts from you guys. I am installing 8 Mitchell products
> cluster gauges in a 1978 PA32-300 (fuel qty, oil press, oil tem, etc).
> I am wondering if there are any disadvantages to using a molex 8 pin
> connector with one side having the 8 power wires connected to it and
> the other side with the single 20 AWG power wire to one pin location
> and then use jumping wires to connect in series the other
> remaining pins so as to power the entire set of 8 gauge clusters. Each
> cluster draws 1/10th amp and 20 AWG wire is attached to the existing
> 5A Inst Gauge C/B. The other alternative would be to use a bus bar
> but I am very limited in locating a good place to attach a bar. Could
> I also do the same for the grounding wires, i.e. 8 ground wires to one
> side of the molex connector and other side with a single grounding
> wire with jumped pins. The single ground wire (size?) would be
> grounded to the frame. The entire installation will be receiving a 337
> field approval. Thoughts?
The architecture sounds reasonable to me, but my personal choice of
hardware would not be molex. I was an electronics tech in several past
lives, and saw a *lot* of reliability issues with them, in a lot of
different environments. In addition, jumping that many pins would be as
big a pain as just jumping from instrument to instrument in the
'traditional' fashion of wiring instruments.
My choice of hardware would be Dsub. The airframe side of the connector
could be a molded solder cup style, allowing you to bridge an entire
line of pins with a single bared wire for B+, and the same on the other
line for ground. A 25 pin connector would likely take less real estate
than a 16 pin molex. The instrument side of the connector could be the
removable pin type of connector, making it easy to add additional power
wires for each instrument. Similar idea to the 'panel ground bus'
detailed in the AEC drawings, but with one row being the supply instead
of ground.
FWIW,
Charlie
--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
===========
-
Electric-List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
===========
FORUMS -
eferrer" target="_blank">http://forums.matronics.com
===========
WIKI -
errer" target="_blank">http://wiki.matronics.com
===========
b Site -
-Matt Dralle, List Admin.
rel="noreferrer" target="_blank">http://www.matronics.com/contribution
===========
|
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Mon Feb 08, 2021 4:19 pm Post subject: Re: Molex vs bus bar |
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Steinair also sells D-Sub pins.
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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Joe Gores |
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