Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 1729853 times)

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Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37350 on: August 23, 2019, 10:14:26 pm »
Huh...

https://hackaday.com/2019/08/22/electric-dump-truck-produces-more-energy-than-it-uses/

mnem
*back to house-packing hell*
Very interesting truck but it does operate under very limited set of circumstances, where else do you regularly come across a situation where something climbs to the top of a hill empty but always descends heavily laden where gravity alone provides more enough force to propel the vehicle all the way to its destination, so the power generated is then stored and as a result of the huge payload and the resultant recovered energy as a product of the speed and gravity effect has the unique ability to produce more energy then it uses?
Who let Murphy in?
 

Offline factory

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37351 on: August 23, 2019, 10:26:30 pm »
Just got the 1740A. Appears to have some problems with it. Comes up but not HT. Debug time!  :-+

Hopefully it won't be a circle jerk like my 485 issue has been.  :scared:

Nope was easy-ish.

Bar the hour I just spent on the blower to a provider on a finger pointing misssion (work), we have a victory at least.

Power supply shot. Took the thing to bits (I bloody love 1740A construction) and yanked off the interface board thus disconnecting both vertical and horizontal boards. Discovered 5V was at 8V (fuck!) and -15V was at 1.02V (double fuck). Powered it down. Reading the service manual it looks like the two supplies are related so I had a feel around. Checked pass transistors. Both fine. Checked ESR on all the power supply caps. All good. Checked the LM723 on the -15V rail. Burning hot! Pulled the pass transistor off and jumped the -15V rail with a power supply and bingo it came up and everything works apart from the flood gun illumination (should be easy to debug). Looks like the high 5V rail has done no damage fortunately  :phew:

Patient on the bench (need bigger bench!):



Bingo:



Now to work out what is dead. Hopefully not the LM723 as they are TO-100 canned ones and are a good tenner a go  :--

That's a nice 1740A, but I could have sworn you said you wanted a HP 180 Series scope, there is a 181A north of me but the price is too far north as well.
Anyone buy the faulty 200MHz 1715A that was on a one day auction?

Just found a strip merchant. eBay user goodmeasures is buying old HealthKit stuff up and selling the guts  :--

What happened to the rest of the Heathkit scopes?  :'(

David
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37352 on: August 23, 2019, 10:43:04 pm »
   My knob arrived today. Damned imperial units.  |O    When will you guys use proper SI units?  :box:   :-DD

When we get to Canada.  :-DD

mnem
Any day now...
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37353 on: August 23, 2019, 10:50:29 pm »
I know, right? Totes giving me a complex after all my work on that 454 cover... :palm:   

Whacha mean? That 454 cover is mine, mine, all mine. 'Ain't no one gettin' that off my bench. 8)

A inferiority complex. After I was all proud of how that 454 cover turned out... I mean yeah, it's a great example of FDM, but how can it compete with hand-rubbed oil finish on   818484-0   inset parquet maple? ??? That's some quantum-level shit right there. *sigh*

mnem
I think I hear some bangerz & beenz calling my name...
« Last Edit: August 23, 2019, 10:57:38 pm by mnementh »
 

Offline neo

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37354 on: August 23, 2019, 11:48:56 pm »
Proof of life!





















HP 5326A, homemade 100v PSU, homemade sweep generator, sixteen panel meters, Heathkit GD1-A grid dip meter with GD1-B manual and a 1922 peace dollar. $105 total. Day 1 of 2019 Joplin hamfest.

P.S., yes you CAN see clutter...... and my feet.
A hopeless addict (and slave) to TEA and a firm believer that high frequency is little more than modern hoodoo.
 

Online wch

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37355 on: August 24, 2019, 12:04:11 am »
I don't know how many pages I am behind on this thread... the last two weeks has been a blur of helping family members and friends with disasters small and large, cordoning off an institutional dumpster fire, and the like.

I haven't had more than an hour a day to spend at the bench so that time was devoted to small projects: building a couple of cheap frequency counters, making kelvin test leads for the 8840A, repairing antenna feedlines, building a portable 2M yagi I can use for the next ultra marathon support gig.  I haven't even looked at ebay or CL in a week. That's kinda scary.

 ;D

And, after helping on yet another clear out a life's worth of someone else's trash treasures from their home project, I am resolved to start pricing and selling the two dozen or so pieces of ham radio gear that are stacked on shelves in the furnace room.  The thought that I might leave someone else stuck with all this junk that I am never, ever going to put to use makes me shudder.

Off to try and at least skim the thread...  :scared:
proceed until apprehended
 

Online wch

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37356 on: August 24, 2019, 12:20:10 am »
Do you know how close I am to tossing this 485 out a 2nd story window?  :o :-DD

That close...... |O

If you decide to do that, let me know so I can park myself under the window, catch it and use it for a parts mule for the 485 sitting here.  Mahalo.

 :-DD
« Last Edit: August 24, 2019, 12:24:26 am by wch »
proceed until apprehended
 

Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37357 on: August 24, 2019, 12:25:25 am »
A inferiority complex. After I was all proud of how that 454 cover turned out... I mean yeah, it's a great example of FDM, but how can it compete with hand-rubbed oil finish on    (Attachment Link)    inset parquet maple? ??? That's some quantum-level shit right there. *sigh*

This guy is unbeliveable. Have you checked out his application notes? He has built some carts for his testing gear.
Really, this is "der absolute Hammer"
Some pics:









Lots of explanations, how-to, very nice pictures:

https://amplifier.cd/Technische_Berichte/Schellack/Schellack_und_Harz_Polituren.html

This is a box for a voltage reference he had built:



Application note: https://amplifier.cd/Technische_Berichte/Spannungsnormal/Spannungsnormal_Eigenbau.html

And it seems that he knows bd139:



Here are his application notes, some are in english:

https://amplifier.cd/Technische_Berichte/Technische_Berichte.htm

This is his lab, he did a lot of reconstruction. Just look at the pictures:

https://amplifier.cd/Labor/labor.html

And this section is for the Test Equipement fans (not sure, if this is interesting you):    ;)

https://amplifier.cd/Test_Equipment/Messtechnik_Test_Equipment.htm

Enjoy!
“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 bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37358 on: August 24, 2019, 02:57:02 am »
I know, right? Totes giving me a complex after all my work on that 454 cover... :palm:   

Whacha mean? That 454 cover is mine, mine, all mine. 'Ain't no one gettin' that off my bench. 8)

A inferiority complex. After I was all proud of how that 454 cover turned out... I mean yeah, it's a great example of FDM, but how can it compete with hand-rubbed oil finish on    (Attachment Link)    inset parquet maple? ??? That's some quantum-level shit right there. *sigh*

Yeah, I getcha. Totally different things, though, so not to worry. I appreciate them both. ^-^
I TEA.
 

Offline bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37359 on: August 24, 2019, 03:00:20 am »
This guy is unbeliveable. Have you checked out his application notes? He has built some carts for his testing gear.
Really, this is "der absolute Hammer"


Amazing! Yet another rabbit hole, ready and waiting... :-DD
I TEA.
 

Offline bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37360 on: August 24, 2019, 03:04:33 am »
Proof of life!




Welcome back! And, ooh, I do like analog panel meters. 8)

I don't know how many pages I am behind on this thread... the last two weeks has been a blur of helping family members and friends with disasters small and large, cordoning off an institutional dumpster fire, and the like.

Welcome back to you, too.

Quote
Off to try and at least skim the thread...  :scared:

Good luck with that. Keeping up is already an adventure. :-DD
I TEA.
 
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Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37361 on: August 24, 2019, 04:54:06 am »
Huh...

https://hackaday.com/2019/08/22/electric-dump-truck-produces-more-energy-than-it-uses/

mnem
*back to house-packing hell*
Very interesting truck but it does operate under very limited set of circumstances, where else do you regularly come across a situation where something climbs to the top of a hill empty but always descends heavily laden where gravity alone provides more enough force to propel the vehicle all the way to its destination, so the power generated is then stored and as a result of the huge payload and the resultant recovered energy as a product of the speed and gravity effect has the unique ability to produce more energy then it uses?



Yeah, the thing is that this was a scenario I remember reading about as a kid; that in "the modern age" such "elegant engineering" would be an everyday thing, to the benefit of all humanity. Inherently efficient feats of engineering like the Duquesne Incline (which I grew up with) were going to be everywhere; kindof annoying disheartening that it took 40 years for this rare example of that engineering ethic to manifest, and then only to the benefit of a quarry owner...  :palm:

mnem
Our society is built upon a culture of waste, all to support a few hundred families "in the style to which they've become accustomed".
« Last Edit: August 24, 2019, 05:16:36 am by mnementh »
 

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Offline SilverSolder

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37363 on: August 24, 2019, 10:50:47 am »

This guy is unbeliveable. [...] 


Gotta love using a spectrum analyzer to tune a guitar...   
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37364 on: August 24, 2019, 01:14:45 pm »
Mega day out tomorrow. MKARS radio rally, Bletchley Park, TMNOC. Turns out I get free entry to Bletchley Park with RSGB membership. Finally a use for it!

For the morning though, Ferengi TE acquisition mode activated  :-DD



Last year I snagged this pile of glory. Hopefully the same this year.



Need some air variable caps, some valves, valve bases and a couple of panel meters too for a project. This time I will buy caps with the correct tuning direction. Clockwise = less capacitance. Fed up of backwards tuning a project I'm working on  :palm:

Edit: talking of which, I'm thinking of designing a widget for hamfests which can be taken along which contains the following bits of equipment:

1. Simple capacitance bridge which gives a 10->500pF readout with nulling for testing variable capacitors.
2. Current source 50uA, 100uA, 500uA, 1mA for testing meters with 10 turn for linearity / sticky check.
3. Continuity tester (checking for cap shorts / RFCs).
4. Bullshit detector (basically button which activates red light) whenever someone tells me something is working and it doesn't  >:D
5. Loperamide dispenser in case you accidentally consume a dodgy burger
« Last Edit: August 24, 2019, 01:22:06 pm by bd139 »
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37365 on: August 24, 2019, 01:35:54 pm »
Mega day out tomorrow. MKARS radio rally, Bletchley Park, TMNOC. Turns out I get free entry to Bletchley Park with RSGB membership. Finally a use for it!

For the morning though, Ferengi TE acquisition mode activated  :-DD



Last year I snagged this pile of glory. Hopefully the same this year.



Need some air variable caps, some valves, valve bases and a couple of panel meters too for a project. This time I will buy caps with the correct tuning direction. Clockwise = less capacitance. Fed up of backwards tuning a project I'm working on  :palm:

Edit: talking of which, I'm thinking of designing a widget for hamfests which can be taken along which contains the following bits of equipment:

1. Simple capacitance bridge which gives a 10->500pF readout with nulling for testing variable capacitors.
2. Current source 50uA, 100uA, 500uA, 1mA for testing meters with 10 turn for linearity / sticky check.
3. Continuity tester (checking for cap shorts / RFCs).
4. Bullshit detector (basically button which activates red light) whenever someone tells me something is working and it doesn't  >:D
5. Loperamide dispenser in case you accidentally consume a dodgy burger
WTF! clockwise is normally the direction of more, not less, eg volume control etc [emoji849]

Sent from my POT-LX1 using Tapatalk

Who let Murphy in?
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37366 on: August 24, 2019, 01:48:26 pm »
LC resonant circuit. F=1/(2*pi*sqrt(L*C)). Any increase of L or C will decrease frequency as it’s denominator.
 

Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37367 on: August 24, 2019, 02:03:09 pm »



 :-DD :-DD
An old gray beard with an attitude.
 
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Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37368 on: August 24, 2019, 02:04:30 pm »
A inferiority complex. After I was all proud of how that 454 cover turned out... I mean yeah, it's a great example of FDM, but how can it compete with hand-rubbed oil finish on    (Attachment Link)    inset parquet maple? ??? That's some quantum-level shit right there. *sigh*

This guy is unbeliveable. Have you checked out his application notes? He has built some carts for his testing gear.
Really, this is "der absolute Hammer"
Some pics:









Lots of explanations, how-to, very nice pictures:

https://amplifier.cd/Technische_Berichte/Schellack/Schellack_und_Harz_Polituren.html

This is a box for a voltage reference he had built:



Application note: https://amplifier.cd/Technische_Berichte/Spannungsnormal/Spannungsnormal_Eigenbau.html

And it seems that he knows bd139:



Here are his application notes, some are in english:

https://amplifier.cd/Technische_Berichte/Technische_Berichte.htm

This is his lab, he did a lot of reconstruction. Just look at the pictures:

https://amplifier.cd/Labor/labor.html

And this section is for the Test Equipement fans (not sure, if this is interesting you):    ;)

https://amplifier.cd/Test_Equipment/Messtechnik_Test_Equipment.htm

Enjoy!

Now that's a cabinet maker :-+ ...to which I am not.  ::)
An old gray beard with an attitude.
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37369 on: August 24, 2019, 02:21:02 pm »
A few crazier ones here mnem:
https://www.eevblog.com/forum/renewable-energy/energy-harvesting-systems-pre-1950/

Yeah, but your very short list makes my point... the relative dearth of such projects over my lifetime. Any engineering project nowadays, the only solution considered is the one which wastes as much energy as possible, and preferably energy from fossil fuels.  |O

Mega day out tomorrow. MKARS radio rally, Bletchley Park, TMNOC. Turns out I get free entry to Bletchley Park with RSGB membership. Finally a use for it!

   For the morning though, Ferengi TE acquisition mode activated  :-DD   Last year I snagged this pile of glory. Hopefully the same this year.   

Need some air variable caps, some valves, valve bases and a couple of panel meters too for a project. This time I will buy caps with the correct tuning direction. Clockwise = less capacitance. Fed up of backwards tuning a project I'm working on  :palm:

Edit: talking of which, I'm thinking of designing a widget for hamfests which can be taken along which contains the following bits of equipment:

1. Simple capacitance bridge which gives a 10->500pF readout with nulling for testing variable capacitors.
2. Current source 50uA, 100uA, 500uA, 1mA for testing meters with 10 turn for linearity / sticky check.
3. Continuity tester (checking for cap shorts / RFCs).
4. Bullshit detector (basically button which activates red light) whenever someone tells me something is working and it doesn't  >:D
5. Loperamide dispenser in case you accidentally consume a dodgy burger
WTF! clockwise is normally the direction of more, not less, eg volume control etc [emoji849]

Yes, but the direction of LESS resistance in most cases.  ;)

@bd - Seems to me half your list there is readily satisfied by a DE-5000 or an Atlas ESR70+, either of which come in a nice convenient pocketable package. But we all know you're too much of a fukkin' cheap-ass to pay for such convenience...  :-DD

mnem
*agitating-ily*  >:D
« Last Edit: August 24, 2019, 02:24:34 pm by mnementh »
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37370 on: August 24, 2019, 02:23:01 pm »
A few crazier ones here mnem:
https://www.eevblog.com/forum/renewable-energy/energy-harvesting-systems-pre-1950/

Yeah, but your very short list makes my point... the relative dearth of such projects over my lifetime. Any engineering project nowadays, the only solution considered is the one which wastes as much energy as possible, and preferably energy from fossil fuels.  |O

Mega day out tomorrow. MKARS radio rally, Bletchley Park, TMNOC. Turns out I get free entry to Bletchley Park with RSGB membership. Finally a use for it!

   For the morning though, Ferengi TE acquisition mode activated  :-DD   Last year I snagged this pile of glory. Hopefully the same this year.   

Need some air variable caps, some valves, valve bases and a couple of panel meters too for a project. This time I will buy caps with the correct tuning direction. Clockwise = less capacitance. Fed up of backwards tuning a project I'm working on  :palm:

Edit: talking of which, I'm thinking of designing a widget for hamfests which can be taken along which contains the following bits of equipment:

1. Simple capacitance bridge which gives a 10->500pF readout with nulling for testing variable capacitors.
2. Current source 50uA, 100uA, 500uA, 1mA for testing meters with 10 turn for linearity / sticky check.
3. Continuity tester (checking for cap shorts / RFCs).
4. Bullshit detector (basically button which activates red light) whenever someone tells me something is working and it doesn't  >:D
5. Loperamide dispenser in case you accidentally consume a dodgy burger
WTF! clockwise is normally the direction of more, not less, eg volume control etc [emoji849]

Yes, but the direction of LESS resistance in most cases.  ;)

@bd - Seems to me half your list there is readily satisfied by a DE-5000 or an Atlas ESR70+, either of which come in a nice convenient pocketable package. But we all know you're too much of a fukkin' cheap-ass to pay for such convenience...  :-DD

mnem
*agitating-ily*  >:D
Ouch [emoji1787]

Sent from my POT-LX1 using Tapatalk

Who let Murphy in?
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37371 on: August 24, 2019, 02:25:05 pm »
Yup... Just glue a pill bottle and a "FAIL!!!" Buzzer/blinkenlight to either one and you've got the whole thing.  ;)

mnem
 >:D
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37372 on: August 24, 2019, 02:51:44 pm »
@bd - Seems to me half your list there is readily satisfied by a DE-5000 or an Atlas ESR70+, either of which come in a nice convenient pocketable package. But we all know you're too much of a fukkin' cheap-ass to pay for such convenience...  :-DD

Cheap ass?  ??? Yes mostly I am :-DD

Actually on the LC front, this quenched the desire for a DE-5000 and I built my own ESR tester from the Jay_Diddy_B design.

330pF cap. Stray 4.2pF fixture capacitance I have to take off in my head. Good enough and you can test in 1KHz steps up to 55MHz  :-+



Also rarely gets used as an antenna analyser  :-DD
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37373 on: August 24, 2019, 03:05:22 pm »
I can see all the vendors shuttering their stalls as they see you coming down the aisle with that steaming pile of Doc Brown goodness in your hand...  :-DD

mnem
This way lies madness.
« Last Edit: August 24, 2019, 03:07:53 pm by mnementh »
 

Offline tggzzz

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #37374 on: August 24, 2019, 03:18:47 pm »
Edit: talking of which, I'm thinking of designing a widget for hamfests which can be taken along which contains the following bits of equipment:

1. Simple capacitance bridge which gives a 10->500pF readout with nulling for testing variable capacitors.
2. Current source 50uA, 100uA, 500uA, 1mA for testing meters with 10 turn for linearity / sticky check.
3. Continuity tester (checking for cap shorts / RFCs).
4. Bullshit detector (basically button which activates red light) whenever someone tells me something is working and it doesn't  >:D
5. Loperamide dispenser in case you accidentally consume a dodgy burger

Add a TDR to measure cable length, cable impedance (50ohms in your dreams), and connectors quality.
There are lies, damned lies, statistics - and ADC/DAC specs.
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