Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
mnementh:
--- Quote from: Vince on June 26, 2022, 11:30:10 am ---...So yeah, I HATE those trimmers too ! :-DD
--- End quote ---
Looks like a job for 3DP to me. Setting aside the plastic rot you describe (yuckyputz! :P), I quite like the beefy ceramic substrate I'm seeing there. I'd try to find a way to fix them.
mnem
mnementh:
--- Quote from: BU508A on June 26, 2022, 01:03:34 pm ---Soldering in the field, literally (next 10 seconds):
https://youtu.be/yl0NNmuaSJE?t=346
:-/O :-+ :-DD
--- End quote ---
Fukkin' crazy Germans... wasting all that time on toy train dioramas. ;) They should be spending it on something important, like hoarding and resurrecting moldy old TE!!! >:D
mnem
Would probably be cheaper... and take up less space. :-DD
mnementh:
--- Quote from: med6753 on June 26, 2022, 01:52:02 pm ---Since 30 Oct 2015 I have ordered from Mouser 102 times. I don't even want to add up the total cost. :o :o :scared: ;D
--- End quote ---
Lets not even talk about my Thrifting habit... :scared:
mnem
...or the mortgage Bezos' Online Crack Shop has on my soul. :'(
Vince:
--- Quote from: capt bullshot on June 26, 2022, 02:27:22 pm ---
--- Quote from: Vince on June 26, 2022, 01:20:51 pm ---
--- End quote ---
Someone had a similar experience before: https://www.eevblog.com/forum/projects/74hctls-logic/msg768989/#msg768989
Apparently they were brothers and sisters to the AHC / AHCT series:
http://www.bitsavers.org/components/samsung/1990_Samsung_AHCT_HCTLS_Data_Book.pdf
There's quite a lot of these logic series (typically) two or three letter designators, and some of them are long forgotten. Some modern ones are quite versatile in terms of level conversion capabilities and voltage domain decoupling (as in VHC, LVX, ...)
--- End quote ---
THanks a lot !! :-+
OK so it was a Samsung special then. I downloaded their 1990 Databook you linked to. Boy 817 pages just about their AHCT / HCTLS chips, I now everything I could dream of ! :-DD
Had a quick read at the first pages. So it was called HCTLS not because it was combination of MOS inputs with Bipolar outputs (like some of the guys said on that EEVBlog thread), it was 100% MOS inside, but they used a special process that allowed them to combine both the low consumption of HCT, and the drive capability and speed of TTL LS, and then some on top of that. So the HCTLS naming was most appropriate then ! :-+
OK, that chip is cool and exotic, I will keep it for sure, a nice little piece of electronics history ! :D
Now on to Googling about 84LS and 74H ....
bd139:
Ok Newbury megapost. It has been 3 years since the last one. Bloody COVID.
So what did I bag?
Well first we have the HP 400E AC voltmeter. Paid £20 for it. And it works absolutely fine. Just needs a clean. Has feet and an IEC socket!
Mmmm sexy boards
Next we have the HP 3311A function generator. Again it works absolutely fine. Paid £20 for it too. One of the feet fell to bits in the car but this is sort of expected.
Very nice
Will work out a new foot solution to this...
On with the shit show we have the Farnell B 30/5 power supply which cost me £10. This I have not tested yet as it requires some cleaning and the capacitors checked before I even consider putting power near it.
And now to the 465B which is broken. There are two identified issues with it. Firstly the HT inverter fuse is blown. This is such a common issue I know exactly where to look because I've fixed it at least 10 times now :-DD
And the culprit came up with the expected zero ohms resistance across it as expected. Lurking in the corner under the HV shield.
Now it won't even start up still. All the rails are fine apart from the +5V which only hits 0.9V and has 2.5 ohms resistance across it. The cause of this is as yet not identified. No tantalum capacitors on the rail appear to be the culprit which suggests the boards need pulling until the faulty one is found and then isolated further. I did isolate it one of two boards though through pulling connectors. One for another day because quite frankly I don't have the time or energy to do it at the moment.
Quick debugging shot however
Worth mentioning here as well. This is probably the final shot that will be taken of this cruddy ass wallpaper. Wish it good riddance!
Also got another copy of Solid State Design For the Radio Amateur for 50p. And the Mullard Transistor Circuits Manual for 50p. Both are for ebay :-DD
And now for something completely different. A small 50 ohm load. 10KW. And yes, that's the coax connector on the front :-DD
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