USB "charger doctor" (volt+current display)

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fran82
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USB "charger doctor" (volt+current display)

Hi guys

I spotted this gadget that may be interesting for those who have/use USB battery chargers… This item allows you to know how many amps is drawing a USB device/charger and also shows the voltage of the 5v output when on load…

Only 6.40$…. I was searching and another higher quality ones with LCD display instead of LED display cost +50$ (dont konw its accuracy….)

http://dx.com/p/usb-av-usb-power-current-voltage-tester-translucent-blue...

I ordered it… Will update, but if anyone has info about it… please share it here…

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fartybum
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fran82
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TX for the ebay link too… but…. I used a 5$ giftcard so only paid 1.40$ Party

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ryansoh3
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That’s a pretty nifty tool, thanks for sharing.

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Racer
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fartybum
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I paid $2.82 on ebay. Smile

Chloe
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Thanks, fran! ^^ Seems like a useful device for my Soshine SC-F3 and other USB devices. I know from my ammeter the Soshine pulses over 1A during charge but would like to see draw at the USB point rather than measuring in circuit with the cell using a DMM.

asval
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atbglenn
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asval wrote:
thanks, I got one from this seller http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=111111345441[/quote]

 

Ordered one from him, thanks Smile

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Werner
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Looks like the r050 is the currentsensing resistor, so there should only 0.05*2.5=0.125 voltage drop. That’s not too bad…I ordered one to test it.

Ouchyfoot
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I ordered three. I figured as soon as a couple of friends see it, they’ll ask me to order them one anyway.

Chloe
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I received mine yesterday, will post some pics tomorrow. It is a nice little device.

fran82
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Thanks Chloe

Mine shipped last week, I will not have it until 2 weeks….

More info will be apreciated Beer

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atbglenn
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I ordered mine on the 15th. Hopefully I'll be getting it soon..

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Glenn7
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Chloe
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It is quite small but for some devices it can get in the way of other ports and plugs. There are small clips which are quite fragile but you can remove the case if you are careful:

Here you can see it just fits with the case removed:

With a device connected it alternates between showing current draw for approx 7 seconds then voltage for 3 seconds.

PCB:

ryansoh3
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You take some incredible photos Chloe, thanks for sharing!

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Chloe
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Thank you, Ryan! ^^

HKJ
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I can see that Chloe got the nice version, mine is not very nice in soldering:

 

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Chloe
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Oh wow. :Sp Does yours work at least?

I made a little video of it in use:

HKJ
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Chloe wrote:
Oh wow. :Sp Does yours work at least? I made a little video of it in use:

Nice video.

I have not really tested it, but it does show 5 volt (I picked it up yesterday).

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Chloe
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Thanks, HKJ! I got mine from Ebay.

Glenn7 wrote:
Getting me one of these, you can still preorder http://www.kickstarter.com/projects/david-toledo/the-practical-meter-kno...

It does look cute. Blue LEDs can be a bit too bright though. I like that the arrangement doesn’t block other ports.

Werner
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Thanks for the video.
Looks a bit weird with the changing amperage…

HKJ
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Chloe wrote:
Thanks, HKJ! I got mine from Ebay.

Same here, and the photo on the dealers page shows the version you have.

It is the same schematic for the two, but mine looks like an earlier version. Yours version is optimized a bit: All parts are smd and the printing on the pcb is removed.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

HKJ
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Werner wrote:
Looks a bit weird with the changing amperage...

Probably because the charger has a pulsing current draw.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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Thanks to all you guys, I find very interesting and just buy one.
In this great forum I am always learning how to spend money Wink

Werner
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Chloe could you please test it with some other devices and report if the current stays stable.

hank
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So which seller has the good soldering job/more recent version?

Chloe
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Werner wrote:
Chloe could you please test it with some other devices and report if the current stays stable.

It is stable when charging my phone (and you can see how intelligent the phone built-in charger is as it draws less approaching 99% full), and shows a steady 0.03 A for my Logitech wireless receiver.

As HKJ said, the Soshine SC-F3 charger pulses during charge cycle. You can see it more clearly with an ammeter or scope:

Werner
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Thanks, now I am awaiting my charger doctor with a smile on my face….

atbglenn
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Werner wrote:
Thanks, now I am awaiting my charger doctor with a smile on my face....

I hear ya! Can't wait to get mine Smile

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