Jacks & sockets

This may seem simple, but its essential to building any synth these days.
They can be 3.5mm, tiny jacks (buchla), 1/4 inch, or banana.

Apart from the Serge banana & Buchla worlds you'll notice that nearly all the jacks

use "PJ" as part of their description.

The most common socket you will come across is the 3.5mm mono jack socket.
16PJ138 style
It's most often used in Eurorack.
It's also known as a switched socket.
This variety is classified as a closed frame.

The sleeve, is most often connected to ground.
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Here is another mono closed frame:

It's PCB mount also. Called a PJ302 3.5mm

These types of jacks are useful for connecting PCBs to faceplates at right angles

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This is a PJ301M-12 :Thonkiconn"

This is also PCB mount

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This is a PJ301BM 3.5mm.

This is mono

..

PJ301CM is the stereo version. Often used as a headphone jack.

I've also seen this used for mini-MIDI jacks

3.5mm

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PJ-320 3.5mm headphone jack socket

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5 pin Switched stereo. 3.5mm PCB socket

Buchla

"Switchcraft “Tini-Jax” are the standard historical Buchla audio cable connections and are just slightly larger diameter and longer in length than 3.5mm connections. They are sometimes referred to as 1/8” in Don Buchla’s manuals, though they are actually .140” diameter connections".
 (Buchla 200e manual) 

This is the mono variety.
Mouser stocks them.

Mouser Part No : 502-41

The Switchcraft data sheet says they are 0.141" diameter.
I often use eurorack cables in Tini jax sockets without any probs, but never the other way round.
If you plug a tini-jax plug into a 3.5mm euro style socket, you can damage the euro socket.

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1/4 Inch

This is a stereo jack.

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DC Power Jack PJ-20 

2.1mm Jack
3 Pin Contact

tayda a-4118

PJ-102AH

Mouser 490-PJ-102AH

Inside Contact Diameter:

2 mm

These are a standard PCB mounted power socket usually used for plugging in DC Wallwart PSUs