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Test Equipment Anonymous (TEA) group therapy thread

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Cerebus:

--- Quote from: bd139 on August 19, 2022, 09:53:12 am ---
--- Quote from: mnementh on August 19, 2022, 02:54:09 am ---The Anniversary Project Table is encouraging all sorts of family fun; tonight after dinner we played Exploding Kittens for the first time. I led with Catomic Bomb right out the gate to take out MIL. Son got to wear the Cone of Shame, and wifey had to hit me with 2 Nope/Directed Attack combos in a row to win.

This game is perversely addictive; the basic strategy is be a dick to everybody to win. :-DD

mnem


--- End quote ---

We do exploding kittens here. A strategy tip: save ALL your skip and see the future cards and attack cards to the end, then burn them on the remaining player. Literally haven't lost a game now. I suspect it's flawed.

--- End quote ---

Or requires a Machiavellian psychopath Ferengi to play a "perfect game". Just saying ...

Cerebus:

--- Quote from: factory on August 19, 2022, 01:10:43 pm ---
--- Quote from: tggzzz on August 19, 2022, 08:52:52 am ---
--- Quote from: David Greene on August 19, 2022, 03:41:01 am ---Hello, my name is David and I am NOT a test equipaholic.

I love this and it is not bad for me.

I have just started my journey.  Began by scrounging the local university surplus center for enclosures to house a dim bulb tester and isolation transformer.  Got some gigantic electrolytics from inside one of 'em.

I had zero test equipment beyond a no-name handheld multimeter.

Now I also own a (possibly broken) EICO signal generator, a (possibly broken) HeathKit capacitor checker and a (possibly broken) Tektronix 7603 with two amplifiers and timebase plugin.

Tomorrow I will probably own a (possibly broken) Tektronix tm506 mainframe.  And a DMM for it by the end of next week.

I still have to buy wire to build the dim bulb tester.

Then fix the probably-broken mainframe.
Then fix the probably-broken scope.
Then fix the probably-broken signal generator.

Then fix the RCA amp that started all this.

Am I doing it right?

--- End quote ---

Welcome to this thread, the rathole, and the forum :)

If you are enjoying it and not harming anybody, then you are doing it right. Except if you set out to rape working equipment for parts like valves ;)

Quick word of caution. Don't use a dim-bulb tester on anything with an SMPS, i.e. much big "modern" equipment. SMPSs act to keep the output power constant; if you lower the input voltage they suck more input current, and the semiconductors don't like that.

Oh yes, learn about RIFA capacitors prefereably before they teach you they exist. We've all had that done to us :(

--- End quote ---

Shouldn't that be, don't use a variac with SMPS, as they cannot limit the current at any output voltage.
An appropriate wattage lamp in a dim-bulb tester if chosen correctly, could prevent the current going high enough to fry the switching transistor, when fault finding on something that repeatedly detonates multiple parts.  :-//

David

--- End quote ---

Yes, it's worth repeating regularly, and in big letters: SMPS are constant power devices, deliberately limit their input voltage and they will draw as much current as necessary to maintain constant power until they cannot do so any more and emit magic smoke. Almost none are engineered to avoid this failure mode if you push them too far below their specified input voltage range.

med6753:

--- Quote from: bd139 on August 19, 2022, 09:56:18 am ---
--- Quote from: med6753 on August 19, 2022, 09:46:47 am ---I got the 2235. And there's a surprise. No pictures yet. Have patience.  ;D

--- End quote ---

Surprise? Coackroaches? Please be cockroaches!  :-DD :-DD :-DD :-DD

--- End quote ---

You wish.  :-DD Nope. Here it is. Notice something? Yep, it works! Powers up fine, nice sharp trace. Yep, it's filthy as hell and the pots/switches are noisy. But it works! How long is anyone's guess.  :-DD

No time today to do a tear down. Will be a follow up. And of course I'll be preparing a BOM for re-cap, etc.



Here's what came with it. A manual for a 2211. Huh? And Ops manual only. I've already downloaded the service manual. And one P6122 probe.

mnementh:
And soon comes the BOM for oodles and oodles of caps and a capacitor shotgun montage...  >:D

mnem
 :-+

bd139:
I wouldn’t recap it. There’s RIFAs on the inlet board and a nasty ass mains filter. Leave it at that. If the PSU isn’t whining audibly then I wouldn’t poke it. Super fragile they are.

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