I assume the 5340A came from AllTest? FedEx has always been very prompt to me. Overnight. And of course AllTest packed it to withstand a nuke.
Goof of the week:
wtf do they use those power supplies for?
I assume the 5340A came from AllTest? FedEx has always been very prompt to me. Overnight. And of course AllTest packed it to withstand a nuke.
No, it's coming from a private seller. Hopefully he packed it well - I wish everyone did it as thorough a job at it as AllTest.
-Pat
oh woe eeez meeee I stumbled across a Keysight N6700B ... muuuuuust rezeeeeest aaaarggghhhh, caught in the make-offer-event-horizon ... tacker..hack..clacker offer accepted ... aaaarrrgllll
GBS !
George Bernard Shaw?
Ginger Beer Shandy?
Giant Bowls of Spaghetti?
Gigantic Ball Sack?
oh woe eeez meeee I stumbled across a Keysight N6700B ... muuuuuust rezeeeeest aaaarggghhhh, caught in the make-offer-event-horizon ... tacker..hack..clacker offer accepted ... aaaarrrgllllOh, who dooya think you're you kidding, woman...? We all know you love it right there...
How many modules didja get widditt...?
mnem
Wow, sorry to hear you've all got the dreaded bug. Hopefully as you stated it will be mild for all of you. I get my Moderna booster on 9 February. Had my 2nd shot on 30 August.
Goof of the week:
wtf do they use those power supplies for?
*pokes TEA thread with a stick*
mnem
*returns to carving the Roast of Doom*
I was busy fixing something that wasn't broken. (my router config)
In other news: We've got covid, all of us. Am very happy that those eligible got our shots. No-one is beyond mancold/flu in seriousness. It feels like a bad case of season flu, so most likely is Omikron and not one of the old ones.
Currently hoping that my parents (who I met last this saturday, when we had, unbeknownst, the virus in the family.) will be able to cope. They have gotten their 3rd shot, and are very careful, so there is hope.
Edit: And the anti-vaxers go: "It's just like the virus targets us. Illuminati 5G indeed!" (In Sweden, the data says that adults between 16 and 60 are 21,1 times more likely to end up in ICU if they get covid and aren't vaccinated.)
Strange, looks like a dick contest in reverse, the smaller it is the more one brags about it ?!
AVO digital measuring system, probably didn't sell very many.
Well, you did use rather a lot of it on that test
The more the betterer !!!
I guess I watched Louis Rossmann too much.. "there is no such thing as too much flux... " .. as he pours half of his 35cc syringe of flux onto a poor SMD resistor
For those playing along at home... Precise application of exactly the correct amount of solder paste is critical to successful reflow soldering.
mnem
Goof of the week:
wtf do they use those power supplies for?
GBS !
George Bernard Shaw?
Ginger Beer Shandy?
Giant Bowls of Spaghetti?
Gigantic Ball Sack?
I hope to be able to finish fixing my 465; found the required info in the service manual (how to tell which way the Dunlops go), so now I'll just gotta muster up strength to waddle out to the workshop and go through the connectors to the Trigger/sweep board.
Edit: "waddle" was chosen as verb, because I'm currently wrapped in longjohns, Army Model 90 shirt, Houdini fleece hoodie, Army model 90 merino sweater, two pairs of socks and a woolen cap that my mother made. This is crowned by a fleece blanket.
nun.
already hadan iq test this year2 modules sitting here.
My line of thinking was that without the mainframe they only take up space.
One 30V and one 100V if I remember correctly, the 100V was gifted to me by a large distributor.
A bit of fun again... was sorting some more... was into wire/electrical stuff... found this old 9V rechargeable battery !
A beautiful Varta. Yes I know the yanks shit on them, but in Western Europe they make good ones.. they only send you the crap ones.. or maybe Varta has a plant in the US or Mexico just for your market and has substandard quality control there, I don't know...
Anyway, there is not even a date on that battery, but no need : it's the only 9V rechargeable battery I ever bought, and I still vividly remember buying it, as a teen, in the local electronics shop. Had to save for a bit to buy it, was so thrilled... said on the tinu it can recharged 1000 times wow... I was in awe of this thing, was the future for sure.
So it's at least 30 years old, maybe 32 I don't know.
I think I used it... never, not even once. But I was happy to have it anyway !
So, will I get my 1,000 cycles then, 30 years later ?
I measured voltage... can't believe it, it still registers something ! 2.5V !
The wonders of electro-chemistry I guess... not my part.
OF COURSE I had to see if it would take a charge !
....Snip.....
Battery label says it's a 9V but back then that meant it really was 7.2V (6x1.2V cells).
Up to 10V charging voltage, it takes zero current.
At 11.5V here, it takes about 50mA.
I will leave it like that for a bit see what that does... will it revive it a bit ?
My bet is the 50mA aren't charging anything at all... must be just a DC leakage current due to the severe state of chemical decomposition this battery must be in ?!
Measured Voltage at metal parts against earth. A couple hunnerd mV, but that's it.
No dangerous voltage after correctly attaching the ground wires within the cabinet.
It'll probably be fine, I've had this Varta Ni-Cd for several decades,
The 1990 Varta PP3 hasn't been charged since Dec 2020 at least, still has nearly 8V.
The Therm DMM/AMM arrived recently, cost me £50 (plus p&p), wonder if anyone else recognises it, I already know what it was rebadged from (took me a bit a research before making the offer). Quite pleased it works as the sellers pics weren't the best advert. https://www.ebay.co.uk/itm/373805200342
David
I don't know... charging it fully and properly, woudl tak e14 hours... like any NiCd battery.
At 50mA I was fast charging it, pushin it, just to give it a quick shot see if there was still life in it in some way...
But charging it completely, would need to do it properly, so 14 looong hours at C/10 ie at 110mAH that's 11mA for 14H.
That's also what's written on the battery itself.
So I would have to time it so as to not overcharge it... OK I guess I can make an effort an keep track of start and stop time.
Just dug out my old NiCd charger ! Maybe I can just that instead...
We are on EEVBlog so before doing anything I tore it apart of course !
Oh boy it looks middle age crude in there !
A transformer, single wave rectification and a current limiting resistor and that's it !
Plugged the battery in there and scoped the voltage across it... see for yourself.
Single wave indeed, and peaks at 12.5+ Volts !
this crude pulsating voltage, that's torture, should be illegal ! How did law back then allow for these things to be sold at all ?!
so... looks like my lab power supply is two order of magnitude more refined than this charger eh ?
At least it's proper DC I am feeding the battery with, and I can control the current.
Well, kind of... it's a basic analog supply not a fancy HP/Agilent microprocessor haunted supply.
So I don't have great control over the current, in the low end. If I set the pot to the minimum, it will still give 40mA or so, or 75mA.. depends on the output voltage it appears.
I guess I can add a series resistor to get to the required 11mA.
Would be so nice to have fancy PSU where I could just set it to say 15Volts and limit current precisely to 11mA or whatever, trusting that it would stick to that no matter how the output voltage varies.
One day, one day....
EDIT : stupid me... there are two 9V slots in the charger. I plugged the battery in one, but was scoping the other/empty one !
So the waveform was for an open circuit condition !
Now I am scoping the proper slot and I see DC with negligible ripple, and it tops at 10.3V or something now, ie the battery voltage I measured prior. So all seems well... letting it charge overnight, wrapped in a fire resistant blanket, floating in a large bucket of water, and smoke detector next to it. Have an IR camera with AI monitoring activity. If anything fishy is going on, I will get a text message on my smartphone.
Your bench charger is a better tool for this task .set the voltage to about 12 V and current to 10 mA put the battery on small plte or in a mug "just in case" and let it charge for >15 hours. Check voltage immeditely off-charge and off-load. Leave it with nothig connected for 12-24 h and check voltage off-load again. Report back. Ni-Cads like to be stored discharged so it might come back to life.
Measured Voltage at metal parts against earth. A couple hunnerd mV, but that's it.
No dangerous voltage after correctly attaching the ground wires within the cabinet.I would recommend that you look out for a PAT (while your pinball machines do not seem to be 'portable', it is applicable to anything connected to a standard outlet). It does not need to be a current one with protocol etc., but as those machines leave your hand when done, it would certainly aid your risk management.
Improvised measurements such as described above are not really a substitute for the prescribed PE resistance/Insulation/leakage tests.