# How can I “listen” to the activity across a wire? [closed]

First of all, apologies if this is a noobish question; I'm a tinkerer with no engineering background.

I bought a device with two buttons on it. After taking it apart, I saw that these are connected to a small PCB with 5 wires sticking out, which in turn are connected to the main PCB of said device.

I want to find out what exactly is happening inside of those five wires in response to pressing either of the buttons. How can I "listen in" to what happens inside of the wires?

• what is the device? – jsotola Jun 23 at 4:11
• you can use the mic input on your computer as a crude oscilloscope .... zeitnitz.eu/Scope_en .... you can also use sound recording software such as Audacity audacityteam.org .... google soundcard oscilloscope – jsotola Jun 23 at 4:18
• You could start following the paths on the small PCB, that connect the switches to the 5 wires. What kind of device? Can you post a photo? Can you draw a schematic? – mguima Jun 26 at 18:27

• I bought a cheap oscilloscope kit you have to assemble for like $20 from an eBay-style site. So those exist. It's also soldering practice. (it uses a microcontroller with an ADC to read the signals and plot them on an LCD screen. Which is about the quality level you'd expect for$20). Not sure if I'd recommend one to someone who doesn't know how to use an oscilloscope, because it's probably easy to blow up too. – user253751 Jun 23 at 11:55