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Forum Index : Microcontroller and PC projects : Eight 9v outputs from USB-C 5v
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| PhenixRising Guru  Joined: 07/11/2023 Location: United KingdomPosts: 857 |
 Don't know if this is of any interest. I purchased for intended purpose. |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6783 |
One has to ask why you would want to get it from 5V, since USB-C is quite capable of providing 9V (and a lot higher) if you use a suitable fast charge power supply and the correct lead with it. :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2127 |
the 9v would be low current |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6783 |
Only up to about 5A if you get it directly from USB-C Power Delivery mode. :) Ordinary USB-C is rated up to 3A. The limitation here is that the 5V will have to go through a boost converter to get to 9V. That will just about double the output current as drawn from the 5V, i.e. you'll need about 1A at 5V to get 500mA at 9V. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| robert.rozee Guru Joined: 31/12/2012 Location: New ZealandPosts: 2350 |
i'd be interested in seeing what is inside; if there are 8x little 1w isolating modules, or a couple of transistors driving a single transformer with eight separate secondaries. cheers, rob :-) |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 857 |
 Side project  I'm working on a mini-rig for performers. I don't like seeing cables strewn across the floor. I want everything to be battery powered (including the PA) and I wanna prove that one doesn't need to be ripped off by the likes of Bose, etc. Looking good thus far. My mini PA consists of a couple of Bluetooth speakers. Bit of an unfortunate name; W-KING D80 but they pack some serious Punch. Playing with lots of ideas, atm. |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6783 |
3x 3.7V lithium batteries in series = 11.1V Drop 1.8V in 3 series diodes = 9.3V (or a LDO reg if you really must) That's close enough for anyone. Now a charger/protection board for 3 cells and you're away. Lots of 9V sockets, rechargeable and no hum or noise. A fuse would be nice to frustrate the plonker that thinks shorting out the outputs would be fun. :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 857 |
Oh sure but this is not a commercial venture. If others like the idea, I want them to be able to source off-the-shelf. They claim that each port is protected/isolated. They actually state that a shorted port won't affect the others. I'll pull the lid when I receive it (well, them). |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 857 |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6783 |
Good idea. Possibly a little polyfuse for each one. I never did get the hang of electric guitar. I'm not much good on an acoustic either for that matter. lol 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 |
Looking at the size of this box, I think there might be an isolation between USB and the 9V outputs, but not every output is isolated from the other, like some professional power distrubutors do. This still allows for ground loops. Some guitar pedals arevery sensitive for ground loops. Volhout Edited 2024-06-15 18:11 by Volhout PicomiteVGA PETSCII ROBOTS |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6783 |
I'm a fan of separate batteries TBH. No ground loops and less wires. :) You just have to remember to switch them off. I really should dig that electric out again and have another play. I'm not sure that I can make it sound any better after several years of not touching it though. lol Edited 2024-06-15 18:35 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| robert.rozee Guru Joined: 31/12/2012 Location: New ZealandPosts: 2350 |
the latest image shows writing indicating a maximum of 100mA per port. aside from cost, this could be achieved with eight of these B0509S DC-DC isolated converter modules: https://www.ebay.com/itm/134739796524 i bought ten of these (except 5v out, B0505S) a while back with a view to using them to simultaneously charge individual Li-Ion cells in a battery pack without need for any balancing, but as yet haven't completed the project. cheers, rob :-) |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6783 |
Looks like a nice box. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 857 |
This is where I'm coming from  Well for a nominal fee, one can have lots of fun without learning I am astounded by MIDI Guitar. No special hex pickups, just any guitar with a regular pick-up. This is some amazing Digital Signal Processing: This is Version 2 But version-3 is due anytime and reportedly even better. |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6783 |
That's very clever. :) Wow.... 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 |
Hi Phenix, I watched some video's on MidiGuitar2, and must say it is impressive. But how to they connect the guitar to the IPAD ? Are they using some bluetooth audio input? Or are they using the microphone input from the 3.5mm headset connector ? Volhout PicomiteVGA PETSCII ROBOTS |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 857 |
Hi Harm, A USB audio interface is required. I keep my eye on this stuff and one of my choices would be something from the Behringer U-Phoria range . Lots of good reports about their low-latency driver. Not long ago, Behringer products were not highly regarded but in recent years they really upped their game. Just got notification that MIDI Guitar 3 Beta for Windows is now available. Unbelievable! It's a great time to be a guitarist |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6783 |
I have a Behringer UCA202 USB sound card. I love it. :) It used to be almost a necessity but these little PCs already have pretty good, low noise audio so it's not as essential now. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 857 |
Well, funny you should mention because I have a question that I believe is right-up your alley; just last evening, I was looking at pulling the guts out of this and also building it into the guitar. But it requires line-level input. How can we bring that guitar pickup level up? I expected to find a DI module (plenty of DI boxes out there) but no-luck thus far. Edit: Oh, I found this Edited 2024-06-17 23:41 by PhenixRising |
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