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Test Equipment Anonymous (TEA) group therapy thread

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Vince:

--- Quote from: TERRA Operative on February 03, 2023, 08:20:04 pm ---If the tants are just for power supply duties,
--- End quote ---

Aren't they always for decoupling power rails anyway ?!  :-//
EDIT : oh no not always I guess... only 99% of the time. In that QUAD 303 pwoer amp I am workign on, I replaced two dipped tantalums, they were used as AC input coupling caps. I guess that's the exception that confirms the rule..


--- Quote from: TERRA Operative on February 03, 2023, 08:20:04 pm ---why not replace with electrolytics with decent voltage rating headroom?

--- End quote ---

I don't know, it did not even occur to me TBH... dipped tantalums are still readily available and cheap so why chance it  ? I am nowhere near as clever as the engineer who decided to use them  :-\

I don't master the subtleties that lead to choosing tantalum or aluminium in this specific application. How will one or the other affect the noise injected to the plates...

Well, I will tell you what. Given how cheap these caps are, and how easy to access that board, I will try BOTH options, and see if there is any difference in quality of the trace, and if there is, I will just go with whatever type of cap works best. Sounds like a plan ?

So as I understand it, the aluminium caps would nee dto be 2 or 4 times the capacitance of the tants ?

So let's say  I use 3.3uF instead of 1uF.

tautech:

--- Quote from: Vince on February 03, 2023, 08:49:19 pm ---So let's say  I use 3.3uF instead of 1uF.

--- End quote ---
I'd go higher to 10 or more.
YMMV

BU508A:

--- Quote from: tautech on February 03, 2023, 09:41:14 pm ---
--- Quote from: Vince on February 03, 2023, 08:49:19 pm ---So let's say  I use 3.3uF instead of 1uF.

--- End quote ---
I'd go higher to 10 or more.
YMMV

--- End quote ---

I'd use 4,7µF/100V/105°C Jamicon electrolytic capacitors and in parallel 1206 X7R 100nF/100V SMD ceramic capacitors from Vishay.
This should do the trick.

DC1MC:
Sorry for spamming this thread, but is a little project important for me and I know that the people collective experience here is way longer than a millennium  ;D, so kindly please go to the thread here and help me chose the MCUs of that project:

https://www.eevblog.com/forum/projects/improved-performance-5v-arduino-nanomega-compatible/

Some of you know me, even personally and know that I'm (mostly) a non-BS, straight person and I've tried to help when I could, now I will appreciate a bit of support  ^-^

Cheers,
DC1MC

TERRA Operative:
My Tek 2467 scope is now calibrated and fully working, yay! The calibration process isn't the most user-friendly thing, and a few steps weren't described very well, but I was able to figure it out ok.

I also have a 2467B so the 2467 just needs reassembly to be put on the 'to sell' pile. :)



Aaannnddd, the Tek AWG510 Arbitrary Function Generator is adjusted now too. This thing is a monster! Waaaayyy big, so it's off to be sold too.

I've decided I want a HP 3458A eventually, so I need to accrue coin. :D

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