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Forum Index : Microcontroller and PC projects : CMM2's......
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9306 |
Peter has done a stellar job with the new design. Look at the two different designs:  New one on the left, old one on the right. Nothing wrong with the old design, but the new one is much "Tighter". Smoke makes things work. When the smoke gets out, it stops! |
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Mixtel90 Guru  Joined: 05/10/2019 Location: United KingdomPosts: 6783 |
It's interesting to see them side by side. I'm glad to see the end of that USB-B socket and a decent battery! Simple things, but fundamental. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 4223 |
Mick, I am glad I have a USB-B socket on mine. Much more robust. Volhout PicomiteVGA PETSCII ROBOTS |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6783 |
The problem hasn't been the connectors, they are ok. It's the difficulty in finding good leads that will actually carry more than a few mA without volt drop. The majority are for connecting printers, where the power conductors are very poor as they aren't actually needed to carry current. Personally I still prefer a barrel jack. They are designed to carry current. Just don't use a large size on 5V systems as someone will connect it to 12V! USB-C is a good choice too, but far more difficult to fit and less robust. There is also the danger of them being used to provide more than 5V if you use the wrong lead and the other end is capable of supplying it. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9306 |
I guess nothing's perfect in terms of connector design or inclusion on a specific design. And there will ALWAYS be a bit of design-by-committee when any forum is involved also, so I kinda like the way that Peter just uses what he thinks best and does not open it up for discussion - cos we all know where that heads to!  As to the loss of the USB-B, I expect he only did that, cos it was just too big to co-exist with the other changes. I like the USB-C connector. It seems pretty tough considering, and is a major improvement on all the things that used to use micro-USB - which is always breaking. I forget how many micro-USB connectors I have had to change on tablets and external HDD's. I hate micro-USB connectors.  EDIT: Micro-USB connectors are fine as a connector, if you are gentle with them. But the problem is that people are NOT. (gentle with them, that is) Once abused a little, they just fail, and some of them are not exactly fun to get to and replace. Edited 2024-05-28 09:40 by Grogster Smoke makes things work. When the smoke gets out, it stops! |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 4223 |
Hi Grogster, I am just amused to see the world going miniature without the need. Take the average new laptop: it has 2-4 USB-C connectors, and no USB-A. The laptop needs to be big (screen, keyboard) anyway. Now everyone carries around USB-C to 4x USB-A hubs, USB-C to HDMI converters. Because peripherals (except monitors/camera's/SSD's) don't need USB-C and will not convert for the time being. Even my current laptop has USB-C for power (probably EU-mandated) but needs more power that USB-C can provide. So the power supply comes with a splitter cable that occupies 2 USB-C connectors. What was wrong with the old power connectors ? They where just as compact, and had a centre pin for signalling (1 wire protocol). Again...just amused.... Volhout Edited 2024-05-28 17:13 by Volhout PicomiteVGA PETSCII ROBOTS |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6783 |
USB-C PD (the power delivery version specifically designed for charging) is quite a beast and is very nicely designed. It can handle 240W as opposed to 2.5W (officially) for a USB-A. Up to 48V 5A, in fact, using a special cable. Given that a normal charger is about 5W that's quite a system. All that while also having high speed data. Agreed, Micro-USB is pretty bad. Mini-USB is far better in many ways, but is only used on cameras now, I think. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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