How to Wiretap Phone Line with DIY Circuit

Give me the scope, I love you'r channel and everything you do. Great job and I hope you're carefully with electricity :)

Again a great video! Thanks!

Great video! Thanks again Medhi!

Where would we be without Hot Glue eh? Scattered in pieces over a wide area, most probably. Dunno about US/Canada, but here in Australia it's against communications authority regulations to connect anything to a phone line without transformer isolation. Not that it really matters, since the whole country is switching to VOIP and analog POTS lines are going the way of the dinosaur. Based on the past and current superb management of the National Broadband Network roll-out, we should complete the switchover sometime in the next several decades... Very generous of you to try and support educational institutions, we need more kids to get interested in science and technology. Great idea mate!

Chris Talbot

Nice scope, would make my life easier and funnier. Greetings from Sweden (not Switzerland with the cheese and Cuckoo Clocks) ;)

Dat scope! GIMME IT!

Daan Prinsze

Curiosity: Does it need a FULL BRIDGE RECTIFIER? It's DC and low voltage/currents...? Could/would a single diode work, considering it's also got capacitors and discharge resistors/capacitors and so forth?

Hey Medhi. I'm building a "FULL BRIDGE RECTIFIER" :). Could you tell me when I need to use an inductor? I have a 9VAC transformer as input to the FBR and a 5V voltage regulator on the output. I plan to draw between 1 and 2 amps from the circuit.

Has anyone attempted to pull the caller id off your oscilloscope yet? I wonder if it's possible...

reuploaded!

ElectroBOOM [Mehdi Sadaghdar]

reuploaded!

ElectroBOOM [Mehdi Sadaghdar]

Hey what happened to the video ?

Anthony Scira

I was half way through this when it said error, i refresh the page and now "This video has been removed by the user." :(

Interesting story, When I was a teenager in the 90s I lived in Florida. We had a hard wired phone in my bedroom and I was talking on it. Lighting struck the lack behind our house, a spark jumped from the reciever to my cheek. I felt it pop in my joints. The phones went out for 24 hours, so I guess it fried one of the substations.

So good the giveaways for schools. Also gimma that scope!

Don't give up try it anyway.

I really thought you were going to include circuitry to trigger the camera to record when you answer the phone. I think your camera's hotshoe allows that functionality. Also. GIMMIE DA MEETAH!!!!

I want I want!:-) I very very want!:-) da scope!

Hey Mehdi... could you make a video about Solar Power?

Gimme dat Scope!

GIMMI DA MEETA, ..... please. .....

Thanks for teaching the world man <3

Maybe ok for a free night light?

Johnny Legbone

Dont care about the useless phone line but 1 LED is not worth the effort. Thanks for saving me time trying it out one day.

Johnny Legbone

You can get much light out of it. The phone line has very limited current. Enough for a single LED, which also renders your phone line useless!

ElectroBOOM [Mehdi Sadaghdar]

Yay, GiveAway time!. Do you think it is worth saving money by running LED's from your phone line for free or is it not worth it these days as the new bulbs are too cheap anyway. Something i have been thinking about for a while.

Johnny Legbone

The lamp scared the bejeesus out of me.

Awesome as always, but may I suggest a Caution for headphone users right before the final test? :)

I reckon you should probably put an audio transformer in, no? (or similar means of isolation) Regardless of clamping I'd feel pretty iffy about connecting my camera directly to the telephone lines with no isolation whatsoever... (though admittedly, this is primarily to deal with edge cases such as the ground loops someone mentioned above, or lightning strikes, etc)

A 1:1 transformer would have gotten rid of that hum. Also instead of a FBR(!) you can use two opposing 5.1v zener diodes, but those are not so easy to come by.

Mickel

You make learning fun!

Those darn lamps always getting in the way! Fingers crossed for a Keysight scope. Love your videos.

The video was incredibly interesting. But LMFAO the lamp was the best part.

Fingers crossed, cmon Scope 🤞. Another interesting useful video. Keep them coming

Please let the lamp be a recurring joke on this channel

You should get a breadboard.......... :D ? Also... It's scary how easy that is. I hope the Governments don't find out! A person I knew was a family member of a person who was *probably* spied on by NZ and Five Eyes because he instigated/arranged protests against Apartheid................ Whenever they answered or made phonecalls, they heard a click like someone pressing "record" on a tape recorder (this is back in the 80s/90s) :D

But seriously, the DC out of the audio port on the camera is common to drive electret microphones and other devices that need a little voltage. Just like how some flashes get power from the camera via the "hot shoe."

Dustin

You clamped the voltages on your line but you forgot to clamp your lamp!

Dustin

FYI, the flash at the beginning looks like it might be an epilepsy trigger. I seem to remember that full-screen red/blue flash was caused that Pokemon seizure in 1997.

Mark

Another hilarious and educational video. Love your work mate.

Richard Boyce

Great to see another video. I really enjoy what you do. Keep it up !!!

The circuit does not provide DC isolation which is OK when connected to isolated battery powered devices. if connected to a mains powered, grounded device then you are probably violating some phone company regulation and may also have a ground loop issue (excessive hum, etc). To solve it would require isolation such as a 600 ohm 1:1 audio transformer.

THE LAMP SCARED THE SHIT OUT OF ME. ... Great video.

PseudsPie

"I just need an enclosure for it" * fills with hot glue * I seriously lost it then

LiraNuna