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Doc B.
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« on: March 30, 2010, 08:53:48 AM » |
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Here's a link to instructions for making a shorting plug. Make two of these and use them when someone tells you to "short the inputs and listen for noise" - very simple and useful tools that should be on every bench. Thanks to our bud Voltsecond for writing this up, oh, so many years ago. http://www.siteswithstyle.com/VoltSecond/Shorting_plug_rca/shorting_plug.html |
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« Last Edit: March 30, 2010, 10:53:20 AM by Doc B. »
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Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.
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JC
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« Reply #1 on: March 30, 2010, 10:18:25 AM » |
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Absolutely essential in certain situations. When I did commercial installations years ago, we carried a variety to cover the various input connectors we might encounter.
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Jim C.
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VoltSecond
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« Reply #2 on: March 30, 2010, 07:17:35 PM » |
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Wow, 9 years ago. It doesn't seem like that long ago.
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Grainger49
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« Reply #3 on: March 31, 2010, 02:21:37 AM » |
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If you like to break in cables a pair of these and a pair of barrel connectors will do it.
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Grainger Morrison,
Mozzie quote: Sacred cows make the best hamburgers!
Remember, YOU are the only one who needs to be happy with the sound of your system.
Eros (stock)/FP-2/Paramour 1/upgrades to all - Power Regenerated
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ssssly
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« Reply #4 on: March 31, 2010, 05:24:45 AM » |
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What's the difference or reasoning for using different resistances?
Or does it not really matter?
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Grainger49
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« Reply #5 on: March 31, 2010, 06:26:18 AM » |
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Each resistance "draws" a different current. All sources have a maximum current they can deliver so if you have a resistance that draws a higher current it goes into current limit, not a good thing.
But for a "shorting plug" you just want to kill any noise there.
Edit: As VoltSecond points out, a shorting plug doesn't have to have a short in it, probably shouldn't because shorting a source will damage the outputs of your source.
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« Last Edit: April 01, 2010, 03:56:36 AM by Grainger49 »
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Grainger Morrison,
Mozzie quote: Sacred cows make the best hamburgers!
Remember, YOU are the only one who needs to be happy with the sound of your system.
Eros (stock)/FP-2/Paramour 1/upgrades to all - Power Regenerated
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VoltSecond
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« Reply #6 on: March 31, 2010, 09:01:40 PM » |
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I recommend that you never use a dead short in these. Something could get broken by accident.
For digital/ video sources, use 75 ohms because that typically is the impedance the circuit is designed to work with. I'll plug "ins" and "outs" on video/ digital. High speed circuits like to be loaded on inputs and outputs.
For audio "ins" 5K works fine. 75 ohms on an Audio "in" also works great.
I normally don't plug audio outputs. If 5K gets plugged into and audio out, it doesn't overload the circuit like 75 ohms will. 75 ohms on an audio out can stress the circuit.
If you only want to build one type, build 75 ohms and be careful you don't plug it into audio outs. Write the ohms on the connector shell with a marker.
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Grainger49
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« Reply #7 on: April 01, 2010, 03:59:37 AM » |
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I have red and black Radio shack cheap RCA plugs. You could use one color for 75 ohm loads and the other for 5k ohm loads.
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Grainger Morrison,
Mozzie quote: Sacred cows make the best hamburgers!
Remember, YOU are the only one who needs to be happy with the sound of your system.
Eros (stock)/FP-2/Paramour 1/upgrades to all - Power Regenerated
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tbbenton
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« Reply #8 on: April 01, 2010, 08:04:06 AM » |
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You could use one color for 75 ohm loads and the other for 5k ohm loads.
But then you couldn't tell left and right apart! |
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Tom Benton
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paulw
Jr. Member
 Offline
Posts: 65
2A3 = Music
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« Reply #9 on: April 01, 2010, 09:47:54 AM » |
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Oops, been using a straight bit if wire in mine for "short the input and listen for noise" duty - but that was based on the instructions in the Paramour manual in the Troubleshooting section!
Paul
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Paul Williams
Acoustic Signature Challenger (with 3 arms), Sugden Masterclass, Quickie, Paramour II's, 7 Pi Corner Horns. (or CR Developments Romulus, Videotone Minimax II's ;¬)
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Grainger49
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« Reply #10 on: April 01, 2010, 09:59:28 AM » |
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Oops, been using a straight bit if wire in mine for "short the input and listen for noise" duty - but that was based on the instructions in the Paramour manual in the Troubleshooting section!
Paul
If that is all you use them for there certainly is no danger. But, as VoltSecond's site points out, there are a lot of other things they can be used for. In the other cases a short wouldn't always work. |
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Grainger Morrison,
Mozzie quote: Sacred cows make the best hamburgers!
Remember, YOU are the only one who needs to be happy with the sound of your system.
Eros (stock)/FP-2/Paramour 1/upgrades to all - Power Regenerated
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