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Post new topic Wiring a DC jack on a rack
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Author Topic:  Wiring a DC jack on a rack
Charlie Thompson

 

From:
South Carolina, USA
Post  Posted 16 Jan 2015 5:02 pm    
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Maybe someone has done this and can help me:

I would like to put a dc jack on the outside of my rack to plug in 9v stomp box effects. I was thinking I could cut off the end of a One Spot and wire it to the jack. THE DC jack has 3 terminals, the one spot has two wires.. How do I wire for common 9v effects?
Thanks



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Charlie Thompson

 

From:
South Carolina, USA
Post  Posted 16 Jan 2015 5:08 pm    
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I'm guessing has to do with wiring for a positive or negative center pin
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Les Cargill

 

From:
Oklahoma City, Ok, USA
Post  Posted 16 Jan 2015 7:13 pm    
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Charlie Thompson wrote:
I'm guessing has to do with wiring for a positive or negative center pin


The pin isn't positive or negative; what you wire to it is. It's probably the outer shell, the sleeve and tip so case ground can be isolated from DC ground.

I'd buzz it out with a meter.
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Stephen Cowell


From:
Round Rock, Texas, USA
Post  Posted 16 Jan 2015 7:33 pm    
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Normally the Cannon jacks have a switching sheath contact... you can get your ohmmeter out and figure out which one is really the outside contact. The two that aren't the tip should be a switch that makes when you unplug the connector... wire those negative.
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Craig Baker


From:
Eatonton, Georgia, USA - R.I.P.
Post  Posted 16 Jan 2015 7:47 pm     Dc Connector
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Charlie,
What you have is a normally-closed switched DC power jack. I's used to disconnect the internal battery when using an external power supply. It operates similar to a headphone jack on a portable radio that disconnects the internal speaker. It will work for your purpose. Just determine which connection is the "switched" one and ignore it. Here is a schematic of a normally-closed switched connector.



Referring to the circuit, connect to the main body of the connector, and the top connection, ignoring the center connection, and of course be sure to observe correct polarity.

Hope this is helpful.

Best regards,
Craig Baker 706-485-8792

cmbakerelectronics@gmail.com

C.M. Baker Electronics
P.O. Box 3965
Eatonton, GA 31024
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Charlie Thompson

 

From:
South Carolina, USA
Post  Posted 17 Jan 2015 5:58 am    
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Thanks for the replies fellas. To simplify this for me:
The One spot will have one wire to the pin and one to the shield.
Which number for the pin and which for the shield?
Thanks

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Jack Stoner


From:
Kansas City, MO
Post  Posted 17 Jan 2015 6:26 am    
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Can't tell for sure by looking at it. The pins will have to be traced with an Ohmmeter.

If you can give use the Manufacturer and part number of the jack maybe we can find out what pin is what.
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Ryan Quinn


From:
Northampton, MA
Post  Posted 17 Jan 2015 7:16 am    
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I've built a few stomp boxes and I usually consult this page to confirm I have it right: http://www.beavisaudio.com/techpages/PedalPower/

Hope that's helpful.
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Scott Duckworth


From:
Etowah, TN Western Foothills of the Smokies
Post  Posted 17 Jan 2015 8:41 am    
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Here is the spec sheet for that exact jack picture. It's does have a schematic of the jack on it.

http://www.adafruit.com/datasheets/KC-301339.pdf
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Charlie Thompson

 

From:
South Carolina, USA
Post  Posted 17 Jan 2015 12:32 pm    
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In the end this was pretty easy. The One Spot has writing on one side of the cable which tested out to be negative that was wired to #3 . The tricky part was knowing to wire to use #1 lug on the positive side as # 2 had no signal with the plug inserted.
Thanks for everyone's help.
Here's a pic of the final product:

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