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Test Equipment Anonymous (TEA) group therapy thread
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Cerebus:

--- Quote from: AVGresponding on July 13, 2022, 10:20:30 am ---Yes, they threw Vauxhall under the bus too; now it's owned by that pan-euro-atlantic-pacific shite-box maker Stellantis, and will no doubt be murdered and all remaining manufacturing facilities in the UK will be offshored.

--- End quote ---

I thought that had already happened or was already at least substantively planned and announced, although I'm quite prepared to admit that I haven't been paying attention.
dl6lr:

--- Quote from: bd139 on July 13, 2022, 12:59:18 pm ---The car I just mentioned is French  :-DD (Citroen)

--- End quote ---

Got a Citroen as a replacement car after an accident in winter 2010. It had a full metal gear shift knob and it felt it was bound to permafrost through a heat pipe...

bd139:

--- Quote from: dl6lr on July 13, 2022, 01:15:27 pm ---
--- Quote from: bd139 on July 13, 2022, 12:59:18 pm ---The car I just mentioned is French  :-DD (Citroen)

--- End quote ---

Got a Citroen as a replacement car after an accident in winter 2010. It had a full metal gear shift knob and it felt it was bound to permafrost through a heat pipe...

--- End quote ---

That’s a feature. The gear stick goes into an ice cube tray full of large nuts.

Citroen can’t do gear boxes I will admit  :-DD
Cerebus:

--- Quote from: AVGresponding on July 13, 2022, 10:39:58 am ---Depends how much fun you want to have. 168kW (225bhp) is enough for quite a bit of fun in a small chassis, especially when you add in 4WD traction, but I have recently found myself wondering how much more I'd be prepared to risk with a remap and stock internals...

I gave up caring about mpg some time ago. It's fine if you live somewhere flat and only do motorway runs, but neither applies to me so I have to just shrug, accept the cost, and get on with it.

--- End quote ---

Depends. My old MGF with a paltry 143 bhp and 1100kg wet + driver will leave many a nominally more powerful car in the dust. Sure it's got a theoretical maximum straight line speed of 130 mph and will take all week to get there. But a 0-60 of 7 secs, wide power band with faultless handling and a "corners on rails" attitude more than makes up for the overall lack of grunt. I've always felt that if you want to really have fun, get a small car.

As far as mpg goes it'll do 25 mpg in city stop start traffic and 50 mpg easily on long runs.
mnementh:

--- Quote from: bd139 on July 13, 2022, 11:21:39 am ---
--- Quote from: med6753 on July 13, 2022, 09:38:08 am ---
--- Quote from: mnementh on July 12, 2022, 07:51:40 pm ---
--- Quote from: bd139 on July 12, 2022, 05:25:45 pm ---
--- Quote from: med6753 on July 12, 2022, 05:24:01 pm ---
--- Quote from: bd139 on July 12, 2022, 05:21:58 pm ---I wouldn’t worry about precision there. They are usually specified to -20% +100%. A 5600uF is fine for the 5000uF

--- End quote ---

Of course and I realize that. But anal me insists we be as close as possible.  |O :P :-DD

--- End quote ---

Been there. I’ve untrained myself from that way as it was getting expensive  :-DD
--- End quote ---

Meh. I'd have slapped a couple 2700uF on there so I could keep the leads through-the-PCB short, which is kindof the point of that adapter and all the different hole patterns it supports. Leaving those leads long like that fucks the ESR of the cap right to hell. :-//

mnem
*unplucked*

--- End quote ---

I disagree. Given that the modern replacements have lower ESR than the originals I see zero net impact.

--- End quote ---

Yep. ESR on them isn’t that important. They’re just there to stop the regulators dropping out at 100/120Hz. Anything which requires lumps of current is well decoupled with tants. Now if you replace the tants that’s a different thing. 2x the value low ESR electrolytics are fine there. But main supply caps, any old shit will do.
--- End quote ---

It has nothing to do with that. It has to do with tiny lead diameter. You can get away with the tiny leads on modern caps when they're 1.5mm long; the wire resistance means diddly. Make them 10mm long and that's a different story altogether. I've seen it demonstrated time and again in high-current amplifiers and the high-current ESCs we use in our quadcopters.

The instantaneous voltage sag that creates is something you can see in real world performance, in dB Drags and in how the quad handles or flips upside down when it should be able to right itself. And I've seen it measured with a scope by people a lot smarter than me, who know how to measure these things correctly.

Now as to whether it is going to matter in this application... probably not. As old man Kirsch used to say: "Choobs are a voltage amplifier; transistors are a current amplifier." (yes, I know this is a gross oversimplification; he said it to make a point about the difference in the way you have to think when designing these circuits most of the time) Meaning the current loading of this system is much lower, so we probably won't see a damn bit of difference.

But it's good practice to keep those leads as close as possible to "just long enough to go through the PCB", because that is how they're designed to be used.

mnem
 :horse:
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