Do these banana jacks share a common connection?

I've used those for decades. I'm not sure what you're asking?

Color problem? 

They are separate inside.

I'm thinking he wants to plug them into his TIU and then come off the other banana to his test track as needed. Asking if the two bananas are jumped internally in the plug I think.

They are separate inside.

BobbyD posted:

I'm thinking he wants to plug them into his TIU and then come off the other banana to his test track as needed. Asking if the two bananas are jumped internally in the plug I think.

Yes jumped internally . if not what would work?

Taking a shot here. The two pins on this connector are isolated (no internal jumper). I do what Joe did. Take a sharpie and color the negative side black. You can stack them by plugging another in on the backside.

This makes no sense. If they were "jumped" internally, you would have a dead short.

So what am I missing?

You can put 2 smaller wires in each hole and tighten them with the set screw. Would that help?

The best use of the banana plugs is how fast you can disconnect them for testing or upgrading.

You can stack more of them together by plugging into the backs of them.

Maybe because he sees a red one and a black one    ?

clem k posted:

Maybe because he sees a red one and a black one    ?

Correct..2 into 1 red and 2 into 1 black.

I think you mean can you stack them. In other words plug one into another.

Then, Yes! That's another feature of them.

If you do too many, you may need to support them. Zip tie them together.

Gosh, I'm thick today! (Whoa, easy!)

They have an internal sleeve that allows current to pass to the next one plugged into the back of it.

They are just two independent banana plugs in a plastic housing. And they can be stacked. Are the banana jacks on the TIU the same spacing as these?

Yes, it maybe some standard? I have used them on pro audio, and now trains as well.

BTW, the color means nothing. I was always surprised that they didn't offer more colors for faster ID.

I use the tab on one side as common. It's marked on most but hard to see.

Thanks guys..i should have clarified better. The purpose of this project is come off the TIU channel with a second set of permanent leads i use to service engines on my bench which is 10 feet away. I typically have the engine upside down in a cradle..run up the speed to 10 smph with my remote and proceed to clean the rotating wheels(3 rail especially..my 2 rail stay clean) hence the one into two banana jack question.

Do these banana jacks share a common connection?

YES! 

sure! 

Maybe? 

Why are you trying to melt my mind? 

Standard 0.750" spacing.  And can be stacked "side-ways" as well as "end-to-end".

WILLYGEE, these dual banana plugs can also be easily modified to accept a barrel plug from a brick, by simply threading the plastic wire ring and adding the female jack.

The particular connector that you have shown is referred to as "Stackable Dual Banana Plug" or "Stackable double Banana Plug". 

The best way to think of them is as two banana plugs in a single plastic casing. There is no electrical connection between the two banana plugs in one plastic housing for the connectors you posted. 

If you want to leave your TIU connected to your layout, and occasionally connect an additional set of leads to the TIU output without removing the connections to the layout, then yes, these would work for you. One of these dual plugs would connect from the TIU to the Layout. You can use a second one of these connected to a set of test leads and plug it into the back of the first one (which is still connected to the TIU output) and run the leads to your bench. 

If you have concerns about this, list out the concerns and we can try to address them. 

I commonly use these at work to connect to bench top test equipment and test boards. Being able to stack them allows multiple connections off a single piece of equipment (a power supply in most cases). And having the two plugs in one connector housing, helps keep the wire pairs together when not in use and prevents mixing pairs of test leads on a messy bench.

This picture is how I have most often used them. It is factory made, but you can do something similar with your own wires and the plugs you have shown as long as they have setscrews to attach the wires to each plug. 

stan2004 posted:

Standard 0.750" spacing.  And can be stacked "side-ways" as well as "end-to-end".

 

stop it!

My brain hurts now......

something like this is one possibility.

Bridgewerks sells some nice heavy ones too. The cheap ones shown above I've used for decades without a single failure. In very HD applications, I go with the lugs. Using the bananas, makes for fast flexible changes. I can't imagine why anyone would need anything heavier in home apps....

well maybe Tom Z???

A DPDT switch would be MUCH simpler.