Products > Test Equipment
finding short on motherboards with a shorty (with display)
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kripton2035:
of course I'm building a pcb right now. but it's not ready, I will make and order 10 by a chinese pcbmaker, test it, and then sell the surplus.
after that if any more interest I will sell more pcb even see if a (smd-only) populated one has interest ?
anyway it has some interest for me only if I can win some small amount of money with it.
if it is to compete with industrial chinese people making it by millions like the famous transistor tester it's not for me !
natman69:
Me too! + 1 on buying a PCB (SMD populated or unpopulated).
Thx
cybermaus:

Yeah dude. Depending on the price, I may take two PCB, so I can mess one up.


Question: you think it is possible to hook up the pre-op-amp probe voltages to some A/D pins of the Arduino?
Or would that disrupt the precision too much?


I am thinking, first put the inputs to high-Z, so you can measure shorty resistance.
If the measurement is out of the high-precision A/D range, then with code we could check arduino A/D and check for typical diode/NP voltage and give a "diode good" beep.
Or, if the arduino is fast enough, even check for rising capacitor voltage.

Cause thats what we always do right. Check for shorts, diodes and ceramic capacitors
kripton2035:

--- Quote ---Question: you think it is possible to hook up the pre-op-amp probe voltages to some A/D pins of the Arduino?
Or would that disrupt the precision too much?

--- End quote ---
don't know. something to try.
cybermaus:

Well, thought about it a bit better, and of course it is not possible with the 82-2-1 ohm probe resistor network. It will never reach the required 1V probe voltage.

To make that work, you'd have to change the 2 ohm in the middle, or even hi-z it, an I am pretty sure that makes it an entire new front end, not merely a "just measure the voltages" mod.

So just KISS, and make it a great short finding device.



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