General > General Technical Chat

Note, do NOT leave bubble wrap on the floor

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Gyro:

--- Quote from: Neilm on July 29, 2020, 06:20:36 pm ---
--- Quote from: Gyro on July 28, 2020, 09:59:14 pm ---
--- Quote from: Fred27 on July 28, 2020, 05:46:16 pm ---Next you'll be telling us that we can't burst a crisp packet when someone is powering on a very expensive piece of equipment.

--- End quote ---

In my day, it was a good squirt of freezer spray into a 35mm film can and then rolled under the victim's bench.  :)

--- End quote ---

What is a 35 mm film can?  :D

An electrolytic or Tantlum wired backwards is always fun...

--- End quote ---

Ah, the youth of today.  :)  It was a small plastic (or sometimes aluminium) cylindrical container with a sealed tight fitting plastic lid - used for storing and protecting 35mm still photographic film canisters when new, and after exposure. Easy to flip up from the edge but it takes a surprisingly large amount of internal pressure to pop it off.

Equally useful for small parts storage and modification into small enclosures.

bd139:
“Catch the 200v charged electrolytic” was a good game at university. 25 years later if anyone throws anything at me I still automatically avoid catching it.

vk6zgo:
The very large bubble wrap which is sometimes used is excellent for startling someone doing something requiring their full concentration.

One job like this is "tweaking" the convergence on a Sony Trinitron, which is usually done using so-called "convergence wands" (plastic strips with a small section of material on one end having a magnetic permeability differing from that of air.).

In use, they are slid under the deflection yoke, &  their position adjusted whilst watching the screen through a mirror.

This entails groping around in close proximity to "hot" terminals on the yoke, so the person doing this is already understandably nervous.
A sudden "bang" behind them has interesting results!

Years before that  I worked at a large radio station which had a cable tunnel underneath the Tx hall.
We used to carry "clipboards" to record meter readings on, & discovered that the sound made by opening the clip & letting it slam shut, after echoing around the tunnel, sounded just like a circuit breaker dropping out.

Great for making the guy in the control room jump!






temperance:
I worked at a company servicing 2kW to 20kW switching power supplies. One guy always thought it was funny to sneak around my desk and clap his hands next to my ears when he saw me carefully probing live circuits with large capacitors (36000µF) charged to 420V. Very dangerous stuff and it requires full concentration to not end up dead. Long story short: this not so funny guy got electrocuted when he was servicing a three phase powered system when he grabbed the bus bars while the equipment was plugged in. His magic smoke escaped. Karma koma

If you really like doing this kind of things to your colleagues, do not wait till the end of the day is near. It will take a while for the legal instances to investigate the scene and you might not be home in time for dinner.

themadhippy:
A bit of solder across the terminals of a lamp holder was an old  favorite .Also leaving open ends on micc  cables after doing a 1000v insulation test was  fun

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