Pinout of DC Jack, etc.

[Steve Mavronis]

I want to verify jack pinouts. Here is a picture of my pedal about to be wired up. The battery snap wires are just dry fitted to experiment with the layout and routing:



On the Beavis Audio site (http://www.beavisaudio.com/techpages/PedalPower/) shows the pinout a 2.1mm DC Jack as follows:



But if you look at the side view compared to the back view's positive polarity lugs 2 and 3 look reversed in their graphic? Instead of 321 shouldn't it be 231 in the back view connection graphic? Then the side view would match as 123. And in my photo above, negative lug 1 is at the bottom with positive lugs 2 and then 3 at the top.

On Small Bear they have this graphic:



This is important which is which because lug 2 goes to the circuit board V+ and pin 3 to the battery red wire. Also, in my schematic I drew the battery black negative wire going directly to the input jack ring lug since that is grounded, and lug 1 is wired to my output jack's grounded ring lug. My DC Jack is plastic so I figured the battery black wire should go to the grounded ring lug of the input jack instead.

Also can someone post a graphic of the lug labeling for a stereo and mono 1/4" jack while we are confirming things?

[.Mike]

Someone will probably come along and answer you, but you will have a better understanding if you figure out the answers on your own than if someone comes along and answers them for you.

If you have a multimeter, this is easy enough to figure out. Put a jack into the socket, and see what is connected to what. It'll only take you a couple of minutes.

Mike

[walker]

yep.  multimeter.  Holding Paperclips in place will also let you make connections without soldering.  Though i haven't tried that with power.


and check out this for 1/4 inch jacks:

http://gaussmarkov.net/wordpress/parts/connectors/14-phone-jacks-and-plugs/

[Steve Mavronis]

check out this for 1/4 inch jacks:

http://gaussmarkov.net/wordpress/parts/connectors/14-phone-jacks-and-plugs/

Yeah that's a good tutorial on 1/4" jacks, thanks. I was just verifying because of the stereo jack using a mono plug to act as a battery switch. I do have I/O jacks and DC jack wired correctly on my schematic. I wanted to know the offical pin number labeling for documentation purposes. I know how it's supposed to be wired. I just want to Verify the Pin Numbers! A multimeter won't tell me that. Maybe this will make it clear. I zoomed in on part of my schematic. The wires at the top go to V+ on the PCB.

As far as the DC jack goes, the Beavis image made me second guess what I thought the pin numbering was. You'd think a Boss style 2.1mm DC Jack would be as well documented as everything else I've learned from Googling. All the datasheets I've found so the physical dimensions but not the pin numbers. Maybe there are none officially?

[keto]

It's not a direct answer to your question, and I don't know for sure that it matters electrically....but I always put the board 9v to the middle lug//next to the ground, and put the battery furthest away....and it always works.