@tubetime neat, I've always wanted to test if I could hear 1MHZ :blobcatgooglyfingerguns:

seriously though I bet that's very useful for quite a lot of different projects ranging from reviving old electronics to hardware mod overclocking to pleasantly gimmicky synthesizers

@tubetime
..but how do you..?
(reads link)
Never mind. Neat! 👍

@tubetime
Small note on the trimpot: Mouser does stock the Spark Fun trimpot. Mouser part number is 474-COM-09806.

@tubetime Speaking of Posy-adjacent things, did you see that someone actually made some of his displays? It's a cute demo of a company's new display-printing tech: https://www.youtube.com/watch?v=jz01j1TpM84

@tubetime I love his video/editing style. I'm far from an audiophile or a collector and I still want one.

Just a great collection of facts and engineering explanation.

@tubetime It's a warning that it's poisonous, and predators shouldn't attempt to eat it.

@tubetime It has a resistance value of 3.1kOhms +/-10%

On a more serious approach, it can be test indicators. (kind of "QA Passed")

@tubetime

It's positive for COVID?

@tubetime Signetics, I would assume. Although not the most frequent logo

https://en.m.wikipedia.org/wiki/Signetics

@tubetime seems to be from Solidev, it's a "Triple 3-input NAND gate":

https://www.bg-electronics.de/datenblaetter/Schaltkreise/CM4000serie.pdf

@tubetime Shouldn't that be 2.56?

@tubetime @adistuder @brainwagon If the units are discrete (increments of 0.01 cm) then there are 256 possible values of length from 0.00 cm up to 2.55 cm. 2.56 cm would be 0x0100.

If the units are continuous (not integers) then it would range from 0.00 ≤ length < 2.56, so length up to but not including 2.56 cm. In this case, answering "how many mm are there in an 8-bit inch" is harder because there are infinitesimally less than 256, and also sort of inaccurate because that's not really 8 bits.

@tubetime am dealing with label printers at work that have 203dpi or 8dpmm ... but actually 7.99dpmm and it does my head in ... but given each label is 66mm and the error for finding the edge for the next is 0.5-2.0mm I think it is unlikely to matter much over that length ...

@tubetime I'm struggling to see how they can make it more expensive... (I've been tempted to learn how to use it but could never afford a license, I just use KiCAD for my projects)

I guess they could just be absurdly annoying and make it so certain features only work with renesas parts

@tubetime for the tourists here would you mind explaining why this is terrible? Asking for a friend!

@tubetime So what does a hobbiest license cost for the complete Cadence stack? They don't return my phone calls! 🙂

@tubetime have you ever seen a moon? You will. And the company that will bring it to you? AT&T

@tubetime

Società Generale Semiconduttori

https://it.wikipedia.org/wiki/Societ%C3%A0_Generale_Semiconduttori

Now that is a great name for a chip company.

@tubetime https://www.inc.com/magazine/19851101/8957.html

@tubetime I swear to $deity some of these chip manufacturer names read like white label Chinese sellers on Amazon. XD

@tubetime "Please don't use if you're allergic to Zytrex or one of its ingredients. Please reach out to your physician if you have questions, and remember to use logic gates responsibly."

@tubetime "Quality Semiconductor", now owned by IDT.

@tubetime I just searched the first line on DuckDuckGo and came up with Quality Semi, specifically a 1-of-8 decoder, by the looks of it? Digikey seems to have a similar product in SOIC-8

https://www.digikey.com/en/products/detail/rochester-electronics-llc/QS74FCT138CTSO/10499614

I wonder if this is the same Quality Semiconductor. too bad about the quality of the chip marking

@tubetime Might be SEMI PROCESSES, INC. https://opencorporates.com/companies/us_ca/0827527

@tubetime could be this one https://www.spisemicon.com/category/about/spi-semicon-north-america/

@tubetime

Semi Processes Inc.

https://www.questcomp.com/part/4/sp74hc113n/384845007

At this page there is also a data sheet.

@tubetime Sescosem

@tubetime
Sescosem

Sescosem was formed during the merger of Thomson-Brandt and CSF in 1968. Thomson's SESCO division was merged with CSF's COSEM division to form SESCOSEM. Sescosem's products were never a big commercial success, but the technology was eventually absorbed in the subsequent mergers that created STMicroelectronics.

https://how-to.fandom.com/wiki/How_to_identify_integrated_circuit_(chip)_manufacturers_by_their_logos/P-T

@tubetime I have a bunch of these in my parts bin they are quite common in the Netherlands (Europe).

Probably don't exist anymore as I have only ever seen 74LS never any CMOS variants.

this little guy turns the 8-bit value into hex! it's also configurable: you can flip the digits upside down for when you plug it into the left side of your breadboard. it can also trigger and latch data on the rising or falling edge of the optional trigger pulse, it can be level or edge sensitive, and you can set it to "single shot" capture a single value.

@tubetime hm. Which palette is that? Some trickery?

@tubetime 🥺

@tubetime Thats neat, kudos for you and your brother!

@tubetime

@tubetime This is just subtle enough to make you double check your math and make sure you have it oriented in the correct polarity.

Unless it's a bit too subtle and then you f#@k around and find out how much energy is in that misapplied capacitor.

We used to say "just put a BFC across the output of that lumpy 48v full wave rectified transformer and you'll be fine"

@tubetime being an electronics apprentice in the 1980s was sometimes a Trial By Fire. Charging a big High Voltage electrolytic cap, wrapping its leads around it and tossing it to the apprentice was a thing. Ow-diddly-ow. Then connecting a tantalum cap backwards across the output of a DC supply and switching it on just as the apprentice walks up… Good Times?

@tubetime holy crap, is all of this so that it can support an essentially infinite/full duty cycle? I mean I’ve lugged 4160V cables and they don’t need this (I mean, yes, they’re AC and high voltage specifically to reduce current and the resultant heat from I-squared R losses, but still)

@tubetime as an EV driver, this is super cool to see!

ouch.

in my own libraries, i like to use multiple markings for pin 1. here i have a semicircle at one end of the chip along with a circle right next to pin 1.

@tubetime Long overdue. I had no idea they were following a standard, its a terrible standard. I've reversed SWD connections a half dozen times because a coworker decided to orient the connector unintuitively and made no attempt to augment the default terrible pin one marker.

@tubetime yea, I have an issue with this too...

the machine is very non-descript and often mistaken for a PC, but it is not.

@tubetime who's locking them down? I've generally not had any issues grabbing the vendor STEP models and using them in KiCad...

@tubetime "locked down" how? /genq

@tubetime ? what software?