Electronics > Beginners

Digi-Key Sold Me 7 Year Old Capacitors

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Brumby:

--- Quote from: Smoky on August 30, 2019, 02:21:49 am ---Well Brumby,

All I can add is that I'm almost positive that the Tenma isolation transformer would have blown its 3 Amp fuse if the Tektronix power supply demanded more current than 3A at 120 VAC.

...and no loads were applied to the Tektronix SMPT while I was ramping up the AC voltage on my bench outside of the oscilloscope. None of the PCB's were connected or fed by the main ribbon cable connector, it was disconnected.

Oops, maybe I shouldn't have left out this fact :)

--- End quote ---

You aren't understanding what I've said.

The numbers I quoted were MADE UP - purely to illustrate a point.  I have absolutely NO idea what the numbers will actually be in your setup.  Those numbers WILL BE DIFFERENT.

However, while the numbers will be different, the principles still apply.

Using my made up numbers to justify your setup is plain silly - and just a little bit worrying.

Smoky:
Don't you do any worrying Brumby!

I just meant to say that I didn't see any unusual amperage draw on the isolation transformer (I can switch between amps and volts on the fly).

The SMPS outputs are regulated, so if I'm not mistaken, a load on them isn't required during powering on.

I just felt I was playing it safe by slowly bringing up the SMPS with the isolation transformer after the "new-old" capacitors were installed.

I'll remember to "reform" large electrolytic capacitors before I install them in a SMPS repair next time and I will not slowly bring up the input AC voltage during the restart.

The TDS420 is running very well, and I imagine it will, well into the future :)




Brumby:
Ah ... OK then.   :-+

Smoky:
I just received a follow-up response from Digi-Key.

They refunded the cost of the five LGX capacitors from my previous order.

I appreciate that, but initially, I requested of them just to send me two "newer" capacitors out of the five.

Anyway, they also said that I can request capacitors not to be older beyond a certain date by using the "Order Note" comment section when placing an online order.

From the responses I've received on EEVblog.com, there wasn't much to worry about concerning the 2012 capacitors, so I have no problem either.

All is good and I do very much appreciate the help from the EEVblog.com community.

You didn't have to go that far Digi-Key, a small credit towards my next order would have been just fine, but thank you too!

Brumby:
I am not surprised by Digi-Key's response.

Companies that care about their reputation will tend to address issues with a solution that only requires their attention once and with minimal effort.  Exceeding a customer's expectations - especially on such a small matter - is the quickest and easiest way.

Besides, they don't know if you are developing a project that could turn into a $10k order every month for a few years.....

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