EEVblog #1375 - Mailbag

Another bumper Mailbag!

SPOILERS:
00:00 - Start
00:17 - Dave hates cats
02:29 - BIG stud power diodes and SCR's
06:20 - Workbench of the week. Louis Borsu from Brussels, Belgium
11:35 - Dave levels up in the IEEE
2nd suck of the sav:
40:32 - The Trig Board from Kevin Darrah:
45:50 - Random mystery teardown

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[alanrutlidge]

Hi Dave. The last mystery tin box is from a Siemens dual terminal optical fibre system. It's the supervision, alarm monitoring and reporting device. It reports alarms in real time as well as storing past events (there was a limit to the number of events it could hold in memory, but alas that parameter has escaped my memory - no pun intended) The printer port on the front panel connects to a serial printer. We used to use a dot matrix printer as it could print one alarm at a time and simply advance the paper through the printer as required allowing many alarm events to be recorded on a single page of tractor feed paper. Helpful as it provided a permanent record of events which aided fault diagnosis

The LT1 and LT2 buttons refer to Line Terminal 1 and Line Terminal 2 hardware equipped to the same subrack. A tech could easily toggle the LCD to display alarms from each Line Terminal independently on the 2 line display using these buttons as well as a facility to scroll through past events.

The unit also extended alarms by applying an earth potential via relay contacts to the power and alarms panel in the equipment rack and to the station's generic alarm facility for visual, audible and remote monitoring purposes. The REG buttons refer to optical regenerators along the fibre route between line terminals. You used the buttons to view the alarm events at each regenerator site.

[CompuHacker]

"Do they still make semis in Mexico?"

There's a 10, 000 acre reservation for the development of a business/industrial park for semiconductor (aimed at newer nodes) manufacturing on the California U.S./Mexico border, with plans for local power generation, on-site water purification (built), amenities, a hospital, with plans for daily commutes of American and Mexican workers (includes plans for a new border checkpoint). Named "Silicon Border". Seems to have no recent developments of actual industrial facilities or any livable buildings, and may have been by the standards of this channel a giant scam. Enjoy researching that, fellow viewers!

[Damien.D]

"I hate cats". "Hong-Kong is not in China".
Ho my. This kind of words could start a third world war.

[justin.campbell]

welp. Its like 12:25 am where I am and im just sitting here watching an aussie bloke open his mail with an oversized knife...

[xbst]

46:46 "There is no note" 46:20 *throws note away*

[guffaw]

I know youtr TV background is pretty great when it fools me for a few seconds to believe that you changed your offices and I just haven't heard the news about it. Maybe having just woken up did its part in this trickery as well.

[p_mouse]

IEEE like most other scientific organizations always give me a VERY bad taste in my mouth.
The whole FUNDAMENTAL idea of science is to be objective, transparent and accessible for everyone.
So everyone can dispute or discuss any claims that are being made in the field.
Putting articles behind a paywall does exactly the opposite and makes science only accessible for those with a big wallet, status or big enough social network.

[MarkMcDaniel]

Ooooh senior member. Do you get a 10% discount at the local pancake house?

[dumandugu]

Thank you for sharing great quality content, I've learned much from your channel and forum. Kind regards from Mexico.

[george.b.]

Silly Dave, it's not an oscilloscope - it's an oscillosocpe! It's written right there on the box! Totally different beast.

[sveip]

The shelves in Louis' workbench are the legendary IKEA Ivar system shelves. Ivar is a common Nordic first name btw.

[PilotPlater]

The trigboard is a very cool project I've been following for a while.

[georgemoore]

I'm surprised you didn't recognise your first item the SCR. I have a dud that is about the size of a hockey puck it was rated at 1700v and 600 A. Both sides mounted onto the buss work.

[JWH]

It would be nice to see a decent teardown of one of those beefy diodes or SCRs

[dorusan]

Oscillosocpe.. on the LCR product case, d'oh!

[FreezeAU]

Yes please for the tweezer shootout, I’m about to buy one!

[landspide]

"I squeeze it really hard and it comes on" 😆 Dicky contacts...

[mrechbreger]

12:15 doesn't the IEEE have enough money for a CNC router or are you the first Senior Member and they tried to use it the first time with some furniture wood they've found on the road?

[charlesdickens]

....but for the workshop you show us early I didn't notice fire extinguishers on walls . Smoke alarms would also help .

[mdizzle]

Definitely loving this new bench of the week style!