Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 2022300 times)

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Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43175 on: November 21, 2019, 05:23:05 am »
                  

Almost a workbench...

With the addition of my little "Fifteen Dollah" CV/CC PSU, my bench is now approaching something close to usefulness. The aluminum pipe-wrench is just because I stole it for $US5 while out thrifting.  >:D The build went something like this: Find little panel regulator module on Amazon for $14; go thrifting for a power source. Turn up a large linear power brick rated at 24V/2A made by Ault for CAD$4; figure its probably good for considerably more given its heft. Tinker around with it on the bench; find the thing will happily drive 3.5A while only sagging from 28.8V to 25.5V on the input side, even running through the OEM overload thermistor.  :-+

Take another trip thrifting looking for an enclosure (among other things on my list); look at everything from a little redwood gift box (later given to my wife) to a little PC subwoofer enclosure with a 3" sub in it. Find some desk lamps and a couple Harmony One remotes; give up & go look through the crafty wooden boxes at the Dollarama. Everything is either just a hair too small or way too big or just too kitschy even for me.  :palm: Then I find this little steel mesh thing for CAD$1.50. Sold!

My original intent was to put a bit of ply on the opening & paint it, then cut the panel meter into the bottom, turning that into the top. When I discovered that the panel mount just snapped into the top of the thing, everything else just fell into place and I realized KISS was the way to go here. Fastened the XFMR to the inside using a bit of bent rubberized coathanger, did up the wiring in 16ga silicone wires from my RC modeling parts box, then added a fan robbed from an old IPTV box and it was up & running.

I can get 26V at 1A; max looks to be 24V@3.5A-ish. Fan control output is 12V; it appears to be hardcoded to switch on at 2.01A CC mode, no PWM. Not sure if there's any thermal control or not.

Still... a good little piece pf kit for CAD$19.50/US$15; now I just need to get something to look at (and generate) wiggly lines in a wire and I might stop feeling like I'm back at my high-school electronics bench.  :P

I'll let y'all know how I fare with the component tester once I have some assortment of components to test with it...  :-DD

mnem
*goes to lie down before he falls down*
« Last Edit: November 21, 2019, 05:53:15 am by mnementh »
 
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Offline ThickPhilM

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43176 on: November 21, 2019, 06:09:20 am »
You know mnem has gone over the edge when he starts dressing his PSU in fishnet stockings...
The font colour I use is an affectation that I make no apology for

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Online tggzzz

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43177 on: November 21, 2019, 08:22:44 am »
Yeah it is. Have had to put it off for a couple of days. Just found the sodding fridge has conked out :--. Literally 2 hours after a week of shopping arrived FFS.

My fridge is >30 years old, as is my dishwasher. I've had them from new. No, they weren't particularly expensive examples.
My freezer is >25years old, and cost £10 second hand.
Car is 15years/0.11Mmiles old, gets serviced twice a decade whether it needs it or not.

Two things spring to mind here, yes of course appliances will typically last that long if you don't switch them on  >:D :-DD :-DD 

Unfortunately for that contention, they have been in use continually.

Quote
Seriously appliance were really made much better than they are today, back in the day when you brought those, even over engineered in some cases, barn door engineering is the phrase I think?

They were far from the most expensive items on the market at the time - so well engineered rather than over engineered.

I have to admit that I've had to pre-emptively repair the dishwasher's metal racks, since some of the plastic was cracking. Sugru is wonderful stuff :)

Quote
So, WTF is going on under the flightpath into Heathrow? :) Alternatively, since I used Which?'s reports as the basis for most of those choices, I consider that subscription a bargain :)

Do you still subscribe? If so and have done ever since you made those purchases then its possible that you might have over the years paid the différance once you get round to actually replacing them no? :-// :-DD :-DD

I do still subscribe, and I do still use the reviews. The benefits are:
  • saving my time by directing my attention to the better alternatives. Example: when buying a car I (1) look to see the top 2/3 cars for reliability (2) go and sit in an example of each to see which is most comfortable (3) search for an example of that type
  • for subjects I don't know much about, it indicates which questions I need to consider
  • buying more reliable things => spending less time/money on shopping (and more on TEA :( )
  • avoiding unnecessary expense. My father claimed that the subscription paid for itself, because he switched to using ordinary soap rather than Cusson's Imperial Leather
  • it has (some) product/manufacturer reliabilty information
  • they actually use the damn things. Imperfect? Of course. But better than most other sources which are thinly disguised press releases along the lines of "I've unboxed it and think it is better than sliced bread". (Mind you, even Which? is beginning to fall into that trap :( ).

Having said that I'm pissed off that much of the detailed information is only on the website, in a form that is unnecessarily difficult to digest
  • there's too little information on each page, presumably to cater for those prats that only have handheld computers with 3" screens. Typically each product's review is sperad over four(!) pages
  • the "star rating" tables summarising the quality/price of each product's multiple attributes only allows 4 items to be compared
There are lies, damned lies, statistics - and ADC/DAC specs.
Glider pilot's aphorism: "there is no substitute for span". Retort: "There is a substitute: skill+imagination. But you can buy span".
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Online Zucca

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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43179 on: November 21, 2019, 08:30:57 am »
@bd139, That's a real bummer but look on the Brightside, its also Black Friday this week, you might find a real bargain fridge. Start trawling the web looking the early bird deals, Amazon have emailing me with their earlybird deals because I'm a prime user, just got myself an Amazon Echo Plus with a £100 off for just £49.99, now to look for compatible gear that I can remotely control via it and then I can be a proper coach potato  :-DD :-DD

Bezos listening to you fap  :-DD

Yeah it is. Have had to put it off for a couple of days. Just found the sodding fridge has conked out :--. Literally 2 hours after a week of shopping arrived FFS.

My fridge is >30 years old, as is my dishwasher. I've had them from new. No, they weren't particularly expensive examples.
My freezer is >25years old, and cost £10 second hand.
Car is 15years/0.11Mmiles old, gets serviced twice a decade whether it needs it or not.

So, WTF is going on under the flightpath into Heathrow? :) Alternatively, since I used Which?'s reports as the basis for most of those choices, I consider that subscription a bargain :)

Just ordered one of AO.com. Will be here Monday. The fridge is 15 years old. I’m not complaining. TCO was around £1.50 a month. It’s probably repairable but the door plastics are cracked. Honestly I expect 3 years out of all white goods. Anything else is a bonus.

I never buy high end devices. My neighbour filled his kitchen up with top end Miele stuff, just so he could show everyone. Seen it being carted off a couple of times already which is funny as all he does is microwave stuff.
 

Offline Ero-Shan

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43180 on: November 21, 2019, 08:56:19 am »
Martin.M I admire when you start a project you seem to close it in a short time.
I have tons of projects open and I do not know when I will end them...  :horse:

Thanks for posting here, amazing!
You're exactly like me, then! And all those unfinished projects use up so much of the scarce space.

I really need to get going during the winter vacation!
 

Online tggzzz

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43181 on: November 21, 2019, 09:12:47 am »
Honestly I expect 3 years out of all white goods. Anything else is a bonus.

I never buy high end devices. My neighbour filled his kitchen up with top end Miele stuff, just so he could show everyone. Seen it being carted off a couple of times already which is funny as all he does is microwave stuff.

Agree wholeheartedly about the high end stuff. Having said that, maybe your neighbour wasn't disposing the Miele stuff because of unreliability.

Apart from that, the only kitchen item I buy expecting to have a limited lifespan is non-stick frying pans. I buy several of Asda's cheapest at the same time, and accept that the PTFE will inevitably wear, and that I might ruin it in short order by overheating it once.
There are lies, damned lies, statistics - and ADC/DAC specs.
Glider pilot's aphorism: "there is no substitute for span". Retort: "There is a substitute: skill+imagination. But you can buy span".
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Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43182 on: November 21, 2019, 09:35:31 am »

That be correct. I build those occasionally using opamps. They're pretty good. It's possible with a not too shoddy opamp to get a remarkably good sine out. Heathkit also featured the same feedback mechanism in the ET-3100 trainer which actually had a better signal generator than some function generators on the market!





Only problem is they take time to settle, age poorly and usually require manual trimming. Thus they are replaced with a JFET as a variable resistor driven from a peak detector on the output now.

I noticed a design in AoE 3e which was quite interesting. They used a crap square oscillator running at 10x the frequency desired and rammed it through a switched capacitor filter. Very neat. I might build one.


A couple of weeks ago I did a similar thing, based on a LT design (OpAmp: LT 1037):



Link to the LT website:
https://www.analog.com/en/design-center/reference-designs/circuit-collections/lt1007-lt1037-ultrapure-1khz-sine-wave-generator.html

Playing around with them:


“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -
 

Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43183 on: November 21, 2019, 09:42:46 am »
So, WTF is going on under the flightpath into Heathrow? :)

Chemtrails.  ;D
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Online tggzzz

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43184 on: November 21, 2019, 09:47:42 am »
So, WTF is going on under the flightpath into Heathrow? :)

Chemtrails.  ;D

Through the roof into a bedroom?
There are lies, damned lies, statistics - and ADC/DAC specs.
Glider pilot's aphorism: "there is no substitute for span". Retort: "There is a substitute: skill+imagination. But you can buy span".
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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43185 on: November 21, 2019, 09:53:50 am »
Honestly I expect 3 years out of all white goods. Anything else is a bonus.

I never buy high end devices. My neighbour filled his kitchen up with top end Miele stuff, just so he could show everyone. Seen it being carted off a couple of times already which is funny as all he does is microwave stuff.

Agree wholeheartedly about the high end stuff. Having said that, maybe your neighbour wasn't disposing the Miele stuff because of unreliability.

Apart from that, the only kitchen item I buy expecting to have a limited lifespan is non-stick frying pans. I buy several of Asda's cheapest at the same time, and accept that the PTFE will inevitably wear, and that I might ruin it in short order by overheating it once.

It was a Miele service van so I assume they were swapping them out.

I found that Ikea sold the best frying pans. I've had a couple of these for nearly 10 years without knackering them https://www.ikea.com/gb/en/p/oumbaerlig-frying-pan-50292096/

So, WTF is going on under the flightpath into Heathrow? :)

Chemtrails.  ;D

Through the roof into a bedroom?

Don't need chemtrails. If it's a busy night you can smell the kerosine in the air!


That be correct. I build those occasionally using opamps. They're pretty good. It's possible with a not too shoddy opamp to get a remarkably good sine out. Heathkit also featured the same feedback mechanism in the ET-3100 trainer which actually had a better signal generator than some function generators on the market!





Only problem is they take time to settle, age poorly and usually require manual trimming. Thus they are replaced with a JFET as a variable resistor driven from a peak detector on the output now.

I noticed a design in AoE 3e which was quite interesting. They used a crap square oscillator running at 10x the frequency desired and rammed it through a switched capacitor filter. Very neat. I might build one.


A couple of weeks ago I did a similar thing, based on a LT design (OpAmp: LT 1037):



Link to the LT website:
https://www.analog.com/en/design-center/reference-designs/circuit-collections/lt1007-lt1037-ultrapure-1khz-sine-wave-generator.html

Playing around with them:


That's very cool. I will read that later in detail  :-+

I made a quadrature oscillator with diodes as amplitude feedback a while back so I could draw balls :) https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg1931791/#msg1931791

I did actually build it and it worked with LM324's
« Last Edit: November 21, 2019, 09:57:28 am by bd139 »
 
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Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43186 on: November 21, 2019, 10:04:11 am »
That's very cool. I will read that later in detail  :-+

I made a quadrature oscillator with diodes as amplitude feedback a while back so I could draw balls :) https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg1931791/#msg1931791

I did actually build it and it worked with LM324's

*LOL*

A screensaver for the scope, how nice.  :-+
If I have some time over Christmas I'll build one as well.  :D
Thanks for the link.
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Offline McBryce

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43187 on: November 21, 2019, 10:29:06 am »
I've one of these as my "scope screensaver": https://vintagetek.org/vintagetek-demo-board/
It's usually connected to my Tek 2465 when the scope is powered but not being used.

McBryce.
 

Online tggzzz

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43188 on: November 21, 2019, 10:35:36 am »
A screensaver for the scope, how nice.  :-+
If I have some time over Christmas I'll build one as well.  :D

For a "proper" scope screensaver, consider a chaotic oscillator.
https://www.instructables.com/id/A-Simple-Chaos-Generator/
https://www.chaotic-circuits.com/ (idiotic formatting, but reasonable refs)
There are lies, damned lies, statistics - and ADC/DAC specs.
Glider pilot's aphorism: "there is no substitute for span". Retort: "There is a substitute: skill+imagination. But you can buy span".
Having fun doing more, with less
 
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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43189 on: November 21, 2019, 10:44:02 am »
That's very cool. I will read that later in detail  :-+

I made a quadrature oscillator with diodes as amplitude feedback a while back so I could draw balls :) https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg1931791/#msg1931791

I did actually build it and it worked with LM324's

*LOL*

A screensaver for the scope, how nice.  :-+
If I have some time over Christmas I'll build one as well.  :D
Thanks for the link.

Built version looked like this:



A screensaver for the scope, how nice.  :-+
If I have some time over Christmas I'll build one as well.  :D

For a "proper" scope screensaver, consider a chaotic oscillator.
https://www.instructables.com/id/A-Simple-Chaos-Generator/
https://www.chaotic-circuits.com/ (idiotic formatting, but reasonable refs)

I'm going to have to dig the 1740A out from underneath my bed now  :-DD
 
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Offline Addicted2AnalogTek

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43190 on: November 21, 2019, 12:15:43 pm »
Yeah it is. Have had to put it off for a couple of days. Just found the sodding fridge has conked out :--. Literally 2 hours after a week of shopping arrived FFS.

Refrigerators are typically very easy to troubleshoot and repair. Treat it just like any other piece of electronic equipment.

Watch Mr Carlson's video for troubleshooting advice: 

In my experience, if it isn't the compressor motor that's died, it's usually bad cRapacitors or stuck relays.

Now off to another 12 hour day at work. Taking thanksgiving week off one job to turn a 12 car metal building into an auto repair shop and finish assembling two vehicles.  :box:

EDIT:   If the compressor motor is starting to seize up, you may be able to pull a few more noisy days of operation out of it by lubricating the bearings with sewing machine oil and rotating it by hand until it's freed up enough to start. Did this with a furnace draft inducer motor last week.

« Last Edit: November 21, 2019, 12:19:21 pm by Addicted2AnalogTek »
 

Online Cerebus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43191 on: November 21, 2019, 12:48:00 pm »
The aluminum pipe-wrench is just because I stole it for $US5 while out thrifting.  >:D

An aluminium hammer/wrecking bar? What use is that?
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 
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Online Cerebus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43192 on: November 21, 2019, 12:48:37 pm »
You know mnem has gone over the edge when he starts dressing his PSU in fishnet stockings...

 :-DD
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 
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Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43193 on: November 21, 2019, 12:53:19 pm »
You know mnem has gone over the edge when he starts dressing his PSU in fishnet stockings...

 :-DD

A dragon has to do, what a dragon must do. Or so. :)
“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -
 
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Offline McBryce

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43194 on: November 21, 2019, 12:58:59 pm »
You know mnem has gone over the edge when he starts dressing his PSU in fishnet stockings...


Gives a whole new meaning to a "cheap PSU".

McBryce.
 
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Online Cerebus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43195 on: November 21, 2019, 01:03:04 pm »
I never buy high end devices. My neighbour filled his kitchen up with top end Miele stuff, just so he could show everyone. Seen it being carted off a couple of times already which is funny as all he does is microwave stuff.

Our Dyson vacuum cleaner died recently after about 20 years. To be honest, it lost a lot of its suck after five and required regular dismantling, internal cleaning and general refurbishment to get it to regain some of its initial power.

I had a brainwave when I was wondering what to replace it with. It suddenly occurred to me that there was one vacuum cleaner brand that I'd seen being dragged around by cleaners in almost every hotel I've ever stayed in. If anybody knows something about vacuum cleaner effectiveness and longevity it ought to be hoteliers. That brand was Mielle.

It's way too soon to make any judgements on reliability (about 3 mths) but the Mielle vac that I bought is just over half the price of an equivalent Dyson, is super quiet, super sucky (in a good sense) and has great ergonomics. Time will tell if my intuition about hoteliers is correct.
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Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43196 on: November 21, 2019, 01:05:32 pm »
What I do really like is this reasoning amplifier in the lower middle:



 :-DD
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Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43197 on: November 21, 2019, 01:23:16 pm »

Our Dyson vacuum cleaner died recently after about 20 years. To be honest, it lost a lot of its suck after five and required regular dismantling, internal cleaning and general refurbishment to get it to regain some of its initial power.

I had a brainwave when I was wondering what to replace it with. It suddenly occurred to me that there was one vacuum cleaner brand that I'd seen being dragged around by cleaners in almost every hotel I've ever stayed in. If anybody knows something about vacuum cleaner effectiveness and longevity it ought to be hoteliers. That brand was Mielle.

It's way too soon to make any judgements on reliability (about 3 mths) but the Mielle vac that I bought is just over half the price of an equivalent Dyson, is super quiet, super sucky (in a good sense) and has great ergonomics. Time will tell if my intuition about hoteliers is correct.

I think you meant "Miele" :)

One of a very popular vacuum cleaner brand here in Germany is Vorwerk:

https://www.vorwerk.co.uk/kobold/home/

And here, for entertainement reasons, an ad for the famous "Heinzelmann" by Loriot (also a very famous comedian here in Germany)


The picture is crooked:


And, as a challenge for all Germans, the spelling of the "th"  >:D
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Offline Tepe

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43198 on: November 21, 2019, 01:34:20 pm »
And, as a challenge for all Germans, the spelling of the "th"  >:D

Ach! Zat iss not funny!

(actually it is hilarious)
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Online Cerebus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #43199 on: November 21, 2019, 01:35:35 pm »
I think you meant "Miele" :)

At least I got the i and the e the right way around; I'm forever spelling Siemens as Seimens,  but at least I manage to pronounce it properly which is a rarity outside Germany, as is hearing the name Porsche pronounced correctly. I'm always a little surprised, and a little embarrassed, that the Yanks usually get the latter right and the Brits don't.
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