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Topic: Wiring a DC jack on a rack |
Charlie Thompson
From:
South Carolina, USA
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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
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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
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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
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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.
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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
_________________
"Make America Great Again". . . The Only Country With Dream After Its Name. |
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Charlie Thompson
From:
South Carolina, USA
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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
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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.
_________________
GFI Ultra Keyless S-10 with pad (Black of course) TB202 amp, Hilton VP, Steelers Choice sidekick seat
Cakewalk by Bandlab and Studio One V4.6 pro DAWs, MOTU Ultralite MK5 recording interface unit (for sale) |
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Ryan Quinn
From:
Northampton, MA
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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.
_________________
Fessenden SD-10, Long-Scale Fender 400, Short-Scale Fender 1000 |
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Scott Duckworth
From:
Etowah, TN Western Foothills of the Smokies
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Charlie Thompson
From:
South Carolina, USA
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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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