Chinese toys

[kt315]

soldered. ready to check

[homefire]

I think you may find Schematic and Assembly on line.

[kt315]

SMDs... will solder them first.

http://ipic.su/img/img7/fs/CIMG6041.1488555736.jpg

[kt315]

bought this tester kit http://www.ebay.com/itm/111990329664

just received it LOL! a board is perfect... esspecially right silk graphics. no schematic there been put, no part list and this is bad.
first thing i did i run by superglue on edge slits of a display. just cause i have bad experience with TFTs that its are not so good sealed at edges in layers.
i killed two TFTs by flux and sealent.

[RH-Lightning]

yes, they are cheaper now. I bought the original couple of years ago and it was available only in usoldered version.

[homefire]

At BangGood the ones with the SMD soldered are cheaper then the Un Soldered. LOL The case is only like $5.00 but you would be better off coming up with something else. One Drop and it's over.

[RH-Lightning]

I've bought this kit:

http://www.ebay.com/itm/DSO138-2-4-TFT-Digital-Oscilloscope-Kit-DIY-Parts-Acrylic-DIY-Case-Cover-S9N2-/172149342823?hash=item2814e68267:g:aRsAAOSwMNxXXoHJ

but with SMD unsoldered and without case. homepage states that these are fake, not original some chinese ripping off other chinese.
it is noisy, but usable.

[kt315]

i see tracing and the joint between line on stabilizator and line on trimmer that tuned preset voltage level.
no magic here. i learned some listings and there are pics of the board with more better resolution.

[homefire]

There is a video on Youtube showing how. It seems you just solder a wire on bottom of board bypassing a resistor/cap.

[kt315]

Buy the Three wire version of those if you can. With those you can only measure down to the required 3 or 4 volts depending on color. With the Three wire version you supply required working voltage and with third wire are able to measure 0vdc to upper limit..

http://www.banggood.com/MINI-DC-0-32...l?rmmds=search

i will tell how to remake three wire version from the two wire as just i will get it.

[homefire]

Careful with the wires. If something happens to them you can't just put new ones on. No Access from the bottom of the board. You would need to remove the LED Display.

HF

[Alexismex]

These Chinese!!!

http://www.ebay.com/itm/232182484453

5 X for 8,68 Dlls FREE SHIPPING
I bought 10

[homefire]

FF, i will answer to you here. i did not want to list all what i buy from chineses... if to be honest, but you inicialize me
to reply.http://www.ebay.com/itm/291989971906...%3AMEBIDX%3AIT
you see - it cost 1.23USD.
i will report as it just arrive.
anyway thank you.

Buy the Three wire version of those if you can. With those you can only measure down to the required 3 or 4 volts depending on color. With the Three wire version you supply required working voltage and with third wire are able to measure 0vdc to upper limit..

http://www.banggood.com/MINI-DC-0-32V-3-Digital-LED-Display-Voltmeter-p-911902.html?rmmds=search

[kt315]

Battery Tester Circuit


[ATTACH]38832[/ATTACH]
[ATTACH]38833[/ATTACH]

With some luck you can draw some schematic from it and built it.
(btw. kt315, I did not follow any of your advices for these pix
the pictures were taken inside a room, macro-mode & flashlight)


LEDs shining red -> yellow -> green

2,4v red weak
3,6v red medium
4,8v red medium, yellow weak
6v red medium, yellow bright
7,2v red medium, yellow bright, green weak
8,4v red medium, yellow bright, green medium

The connection through the diode was connected with the device
and the push-button doesn't interrupts it. This is good because
batteries which are providing just some mA for LEDs look "full"
while reality might be totally different if they have to "work"
(when they have to provide something like 100 or 200 mA).

FF, i will answer to you here. i did not want to list all what i buy from chineses... if to be honest, but you inicialize me
to reply.http://www.ebay.com/itm/291989971906...%3AMEBIDX%3AIT
you see - it cost 1.23USD.
i will report as it just arrive.
anyway thank you.

[greylourie]

There has been another thread posted about these, here on geotech. All these Chinese clones are derived from here : http://www.mikrocontroller.net/artic...ansistortester

Get the manual with reference to the most uptodate firmware 1.17k, here : http://www.mikrocontroller.net/artic..._.28English.29