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How can I connect the electronic circuit to the computer when I to use it as an oscilloscope?

I installed a software that let me use the PC as an oscilloscope , but
it does not mention how to connect the circuits to be tested with the computer an through which port.Does anyone lead me?
I mean how can I connect that cable to
the circuit ?

Link to this post: How can I connect the electronic circuit to the computer when I to use it as an oscilloscope?

What electronic component is failing if an hour warm up is required for normal operation?

I got a scanner, i know it got a very simple circuit board because i open it once, but it need warm up if i didn’t use it for a month, if i use it yesterday, it won’t require warm up to function as normal. So what is the component that need to replace, i suspect it would be the capacitor, if it is the case, would the big capacitor fail 1st or the small one. Any electronic repair expert kindly give me some ideas, thanks.

Link to this post: What electronic component is failing if an hour warm up is required for normal operation?

How long do you keep boxes of electronics?

I’ve accumulated a lot of “specialty” boxes for all the electronics in my life. I’ve got mp3, gps, computer, cell phone, components, and wireless device boxes for all the electronics I have and I generally try and keep them. I’m about to move and I’d like to get rid of them but I worry I may need them to send in or something like that. Any thoughts?

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Measuring voltage at a circuit point

This is an important action when checking the circuit performance for analysis or when you repair a circuit/electronic device.

When testing circuits you often need to find the voltages at various points, for example the voltage at pin 2 of a 555 timer chip. This can seem confusing – where should you connect the second multimeter lead?

measure circuit point
Measuring voltage at a point

  • Connect the black (negative -) lead to 0V, normally the negative terminal of the battery or power supply.
  • Connect the red (positive +) lead to the point you where you need to measure the voltage.
  • The black lead can be left permanently connected to 0V while you use the red lead as a probe to measure voltages at various points.
  • You may wish to fit a crocodile clip to the black lead of your multimeter to hold it in place while doing testing like this.
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