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Rickles

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#316149 20-Sep-2024 11:12
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I need to power a device rated at 6 volts via a USB port.

 

Most USB chargers appear to be 5V, so is there a 6V one available?

 

I see that KMart offer a wall charger rated at  

 

  • Output: DC 5V 3A/9V 2A/12V 1.5A

so presumably that would do the job?


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Lias
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  #3284411 20-Sep-2024 11:23
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The USB standard requires 5v (except for PD but that's a whole different kettle of fish).

 

I'm guessing maybe the device designed to be powered at 5v via USB or 6v via another route? 





I'm a geek, a gamer, a dad, a Quic user, and an IT Professional. I have a full rack home lab, size 15 feet, an epic beard and Asperger's. I'm a bit of a Cypherpunk, who believes information wants to be free and the Net interprets censorship as damage and routes around it. If you use my Quic signup you can also use the code R570394EKGIZ8 for free setup. Opinions are my own and not the views of my employer.




wellygary
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  #3284412 20-Sep-2024 11:25
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6V???, 

 

This is not even one of the USB-C PD voltages,  

 

What is the device, is there anyway to actually confirm its 6V, ... 

 

I think its most likely a typo....???


Rickles

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  #3284413 20-Sep-2024 11:26
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The device is a blood pressure monitor and the stamp on side by micro USB port reads 6V.

 

Can also take 4 AAA batteries.




bagheera
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  #3284415 20-Sep-2024 11:38
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so 6v with battery, most thing tho will not know 1v different and will run fine on 5v too


Gordy7
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  #3284421 20-Sep-2024 11:45
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Rickles:

 

The device is a blood pressure monitor and the stamp on side by micro USB port reads 6V.

 

Can also take 4 AAA batteries.

 

 

Have you tried running your BP monitor on a regular (5v) USB supply?

 

Edit: Maybe it would be unsafe to run your BP monitor on a higher voltage USB supply (>6v)





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eracode
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  #3284422 20-Sep-2024 11:49
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bagheera:

 

so 6v with battery, most thing tho will not know 1v different and will run fine on 5v too

 

 

On 5v, when it needs 6v, it may under-read pressures at 83% - which is great and more like what you want to see. 😀





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Scott3
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  #3284424 20-Sep-2024 11:59
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If it is fitted with a standard micro USB port, it is highly likely it is intended to run at the standard USB volage of 5 volts. Just need a simple USB A to micro USB cable, and whatever USB power source you have handy.

Should note it is unlikely the device is a charger. More likely an alternative to having batteries in it (and on cheaper stuff it is a good idea to have the batteries removed when running from the wall, in case they don't get automatically isolated).



If it runs fine off AA's, there is a decent chance that is is designed to run at anything between 6V and 4V. as you can see below, the voltage of an Alkaline battery drops quickly as it discharges.

Regular AA & AAA batteries are rated 1.5V and rechargeable ones are rated  1.2V why the dif and does it make a dif to the devices using them? - Quora


Gordy7
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  #3284427 20-Sep-2024 12:11
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It would be useful to know the model of the BP monitor.





Gordy

 

My first ever AM radio network connection was with a 1MHz AM crystal(OA91) radio receiver.


nitro
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  #3284429 20-Sep-2024 12:19
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eracode:

 

On 5v, when it needs 6v, it may under-read pressures at 83% - which is great and more like what you want to see. 😀

 

 

if it is a certified medical device, probably won't be able to sell it with that behaviour. even a set of four Alkaline/Lithium batteries, won't be at 6V for long. i would have thought it's more likely to run into issues inflating the cuff than a rather straightforward pressure read.

 

 


wellygary
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  #3284431 20-Sep-2024 12:29
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See if you can Rustle  up 4 rechargeable AAA batteries,...

 

As in the above chart, they output 1.2V, so 4 will give a working output of 4.8V,

 

if it works fine,  then you can happily run it off a 5V charger,   


Rickles

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  #3284435 20-Sep-2024 12:33
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Have tried id with normal (5V) charger and cable ... getting Err 4 which seems to mean "pump or cuff"

 

Everything looks fine physically and pump gets some good pressure, but might be internal problem with unit.

 

OR really does need 6V for full pump pressure?


 
 
 
 

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Lias
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  #3284440 20-Sep-2024 12:37
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Rickles:

 

Have tried id with normal (5V) charger and cable ... getting Err 4 which seems to mean "pump or cuff"

 

Everything looks fine physically and pump gets some good pressure, but might be internal problem with unit.

 

OR really does need 6V for full pump pressure?

 

 

Does it work okay with 4 new decent 1.5v batteries? 





I'm a geek, a gamer, a dad, a Quic user, and an IT Professional. I have a full rack home lab, size 15 feet, an epic beard and Asperger's. I'm a bit of a Cypherpunk, who believes information wants to be free and the Net interprets censorship as damage and routes around it. If you use my Quic signup you can also use the code R570394EKGIZ8 for free setup. Opinions are my own and not the views of my employer.


Rickles

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  #3284441 20-Sep-2024 12:40
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About to go get new AAA batteries.

 

 


huckster
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  #3284448 20-Sep-2024 13:03
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Make and model?

 

With the USB adapters you tried, what was the rated number of amps? Maybe it needs something with a bit more amp-grunt. Some old phone charges only go to ~700mAmps.


Rickles

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  #3284451 20-Sep-2024 13:08
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Make is  Jziki

 

Chinese manufacturer but meant to be reasonably reliable middle-of-the-road and for home use.


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