General > General Technical Chat
(Defacto) standard DC barrel connectors
ebastler:
--- Quote from: coppice on January 12, 2024, 01:44:37 pm ---Find a CCTV camera that doesn't have the same connector with the same polarity and 12V requirement as the rest. If you can it will be a strange outlier, or something specialist with unusual power needs.
--- End quote ---
Unusual choice of example. I would argue that any CCTV camera is a "strange outlier" today, and has been for 10 years or so. Isn't everything TCP/IP based these days?
coppice:
--- Quote from: ebastler on January 12, 2024, 01:52:47 pm ---
--- Quote from: coppice on January 12, 2024, 01:44:37 pm ---Find a CCTV camera that doesn't have the same connector with the same polarity and 12V requirement as the rest. If you can it will be a strange outlier, or something specialist with unusual power needs.
--- End quote ---
Unusual choice of example. I would argue that any CCTV camera is a "strange outlier" today, and has been for 10 years or so. Isn't everything TCP/IP based these days?
--- End quote ---
Those are CCTV cameras. Many have a PoE power option, but they usually have a 12V barrel connector, too. I think they want to be able to sell as drop in replacements, so they want to be able to reuse existing power wiring.
tom66:
--- Quote from: ebastler on January 12, 2024, 01:52:47 pm ---
--- Quote from: coppice on January 12, 2024, 01:44:37 pm ---Find a CCTV camera that doesn't have the same connector with the same polarity and 12V requirement as the rest. If you can it will be a strange outlier, or something specialist with unusual power needs.
--- End quote ---
Unusual choice of example. I would argue that any CCTV camera is a "strange outlier" today, and has been for 10 years or so. Isn't everything TCP/IP based these days?
--- End quote ---
It's still pretty common for smaller CCTV systems to use analog HD cameras. These use a modified "PAL" format to transmit colour analog HD video over a single coax cable. The one I have does 1440x1080i @ 30Hz with a 25MHz colourburst frequency. I'm even aware of 4K capable cameras, though their frame rate is quite low: 10-15Hz. OK for CCTV though.
PoE and IP cameras are common too but a bit more expensive in my experience.
BrokenYugo:
--- Quote from: nctnico on January 11, 2024, 04:37:54 pm ---Then again, if the OP is looking to design a product it could be worth considering using USB-C and a small chip that negotiates the required supply voltage.
--- End quote ---
This, a USB PD charger is a universal wall wart that does the voltage setting automatically. Adds a lot of idiot proofing when you can't break things by simply plugging the wrong stuff together.
What I do for the 5.5mm barrel jack stuff I have is lots of labels, flag on end, one on brick, one on device if it isn't clearly labeled.
madires:
As the family's repair shop I see tons of wall warts and power bricks. The most widely used barrel connector is 5.5/2.1, followed by 5.5/2.5 and different smaller ones, rarely larger types. Voltages are all over the place, and the larger connectors are typically used for higher currents. Another thing to note is that many connectors come in two lengths (usually 9 and 14mm).
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