Is this the same size jack as a standard BOSS 9v?

[stirfoo]

http://www.taydaelectronics.com/dc-power-jack-2-1mm-bulkhead-type-panel-mount.html

I ask this because I picked up a jack at a local mom & pops electronics store and the inside diameter was good, but the center pin was too big.

[Mike Burgundy]

2.1mm denotes the center pin as 2.1mm. That's the right one. I suspect you found the 2.3mm, which is also common for non-stompbox electronics.

Edit: the datasheet specifies the contact resistance to be under 0.3Watts, and isolation over 100 MegaWatts. Um... 

[stirfoo]

thanks Mike

[cctsim]

This dc power jack could potentially give you problems with center negative type of PSUs and metal enclosures.

The plastic ones are better in this case

http://www.rapidonline.com/Cables-Connectors/DC-Power-socket-for-panel-cut-out-12-6mm-63543

[stirfoo]

This dc power jack could potentially give you problems with center negative type of PSUs and metal enclosures

Thanks cctsim. The way I have this thing designed, the enclosure is signal ground (not power ground). So I would need to keep the 9v jack isolated.

[Paul Marossy]

They way I remember is "5.5/2.1" - 5.5mm barrel and 2.1mm pin. Can't tell you how many wrong DC jacks I bought when I first started out... 

[Mark Hammer]

There are two general kinds of isolated plastic 2.1mm jacks: those that have the securing nut attached from the inside (type 1), and those that attach it from the outside (type 2).

Type 2 has the advantage that you can solder all necessary wires to it without having to install it in a box first.  It also takes up less internal space in the chassis.  It's disadvantage is that it sticks out from the chassis even further than many phone jacks, so it complicates jack placement for those who wish to have a nice snug pedalboard.

Type 1 has the advantage that it installs relatively flush with the outside of the chassis, so anything you plug into it doesn't have to stick far out and require space to do so.  The disadvantage is that it takes up far more room inside the box, and has to be installed in the chassis before soldering any wires to it.

Neither is intrinsically better than the other.  They each have their pros and cons that may or may not apply in your circumstance.

Check any posted pictures first, before ordering from anywhere, so that your individual needs are better met.