Re: New tool to find short capacitors on motherboards : shorty with display
this is the actual state of the schematic of the shorty-with-display input stage....
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Re: New tool to find short capacitors on motherboards : shorty with display
transistor is on an analog pin 3 A3, and button on a digital pin 3 D3
they are not the same pin.
anyway, the transistor is always on, and has been removed from the source code when I use the constant current source....
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Re: New tool to find short capacitors on motherboards : shorty with display
I added a voltage regulator 1755S to bypass the one inside the arduino. just thinking there would be a better regulation than the 1117. I also added a constant current source with the pnp transistor, to have better accuracy and better reproductibility of the measures.
now I'm debugging this new schematic, it's almost working, but as a reminder it is a hobby project, and I have been very busy these last months.
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Re: New tool to find short capacitors on motherboards : shorty with display
I received the pcb some times ago. but there is a failure I did not find until now.
I made some changes in the schematic, using a constant current source for better repetability,
well I'm still investing. the voltage regulator is giving 2.4V instead of 5V
... and it does not seems to be a short circuit !
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Re: New tool to find short capacitors on motherboards : shorty with display
sure !
[url]http://kripton2035.free.fr/Projects/shorty-display.html[/url]Re: New tool to find short capacitor...lay.html[/url]
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Re: New tool to find short capacitors on motherboards : shorty with display
nice to see other variations around my project !
the pcb is ready to send to manufacture (for prototype and test only). should receive it in 2 weeks. then test it and if it is ok manufacture in greater qty.
it should cost EUR 10 with untracked shipping, and EUR 15 with tracking.
there will be an order button on my pcb page of the project.
for now, the last variation of the pcb....
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Re: New tool to find short capacitors on motherboards : shorty with display
sorry only bare pcb for now. may be later a smd-only populated pcb if there is interest.
you should be able to get all the components for less than $20...Last edited by kripton2035; 03-10-2021, 04:32 PM.
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Re: New tool to find short capacitors on motherboards : shorty with display
@dicky96
yes I use the ad8628 in the sop-8 package for my pcb. (and the mcp3421 in sot23-6)
anyway as I will publish the kicad files (schematic and pcb) once the pcb is ok
you will be able to change the package if you need it.
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Re: New tool to find short capacitors on motherboards : shorty with display
yes look at the freecad file some posts above
[url]https://www.aliexpress.com/wholesale?catId=0&SearchText=arduino+nano[/url]Re: New tool to find short capacitor...ino+nano[/url]
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Re: New tool to find short capacitors on motherboards : shorty with display
the pcb is not final in size... I'm thinking of adding one pad with a 1Ω resistor to calibrate easily. but it will be defined soon. yes the oled seems difficult to put nicely into a case. I've never seen a 0.91" oled nicely fitting in a case ! that's why I am now not focusing at all on a 3d printed case. I would leave the pcb alone.Last edited by kripton2035; 03-05-2021, 12:15 PM.
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Re: New tool to find short capacitors on motherboards : shorty with display
it is a standard 0.91" oled module, in a 128x32 resolution. plenty of them on ebay or ali
there will be a button on the pcb page to buy it, but please wait 1-2 months before it's available.
I must first make one, buy one, receive it and test it, and then only they will be available.Last edited by kripton2035; 03-02-2021, 11:27 AM.
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Re: New tool to find short capacitors on motherboards : shorty with display
I've published the first draft of schematic and source code of the project. enjoy !
[url]http://kripton2035.free.fr/Projects/shorty-display.html[/url]Re: New tool to find short capacitor...lay.html[/url]
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