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The Cookie Knows
11/30/2018 at 20:43 • 8 comments

We had Chinese take-out last night, and check out the fortune from my cookie:
It's a sign from the universe about which way to take future projects.
More data on PCB Gremlins
12/23/2017 at 17:47 • 0 comments

So, the PCB Gremlins got to the TritiLED V3.0 board. The timestamp on the gerber files is at 20:49 local time, making me think that the mysterious PCB-bug-inducing behavior is not limited to post-midnight design sessions.
I ordered the boards before prototyping the circuit: today, on a breadboard, I found the problem - an input line on the 74LVC1G123 pulled high when it should be pulled low. I haven't even received the PCBs back yet. I can rework the three incorrect PCBs easy enough - cut a trace and run a piece of wire-wrap - but it means another order to have a "releasable" version for the coin cell challenge.
Moral of the story: even the relatively early 20:49 is late enough for the PCB Gremlins to strike.
Beware.
RadioShack Cabinet
06/24/2017 at 23:44 • 5 comments

A local store closed about 10 years ago, and the manager sold me this cabinet for $50. No parts inside, though :( It brings back fond memories of projects in my youth.
For years, it was behind my 10m target range, and somehow got hit a few times. This mystifies me, because I *never* miss ... there must be a hole in my trap :-)

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Ken Yap wrote 12/19/2020 at 21:48

Thanks for liking #DTL binary clock !

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rudolfII wrote 10/27/2020 at 13:45

Hello, I only got here to ask whether you still use xfig to draw schematics and whether you could share your library. (You mentioned you did not like the included one). Thanks. [I don't use twitter, basically nothing except for the email (rsykora@disroot.org), I couldn't find yours anywhere.]

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Ted Yapo wrote 10/27/2020 at 14:43

sometimes. Here's a link to the library:

https://cdn.hackaday.io/files/13027557347168/schematic_library.fig

it lives in my "Templates for Hackaday.io" project:

https://hackaday.io/project/13027-templates-for-hackadayio

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rudolfII wrote 10/27/2020 at 19:17

Thank you!

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Dr. Cockroach wrote 03/03/2020 at 22:20

Hey Ted and thanks for the like/follow for #Shortwave Crystal Radio - A blast from my past :-)

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Lizard Breath wrote 02/23/2020 at 03:11

I like your AR workbench project. Do you plan to take it back off the shelf any time soon?

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Ted Yapo wrote 02/23/2020 at 15:21

I think this one is probably destined to be perpetually concept-only.

So many projects; so little time.

That said, if you'd like to pick it up and run with it, I'd be more than happy to answer any questions you may have!

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Daren Schwenke wrote 01/13/2020 at 10:34

Thank you for your interest in my minor exploits @Ted Yapo.

Eventually, I hope to become worthy of your continued attention.

That day is probably not today, but eventually.. the faithful.. will see their just reward. (This altered state brought to you by 2112, still playing in my head. RIP Neil. )

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Jan wrote 11/19/2019 at 21:11

Really enjoyed your appearance on the amp hour podcast!

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Dr. Cockroach wrote 08/30/2019 at 07:42

Good morning Ted and thank you for the Follow/Like of #Light Logic - Diode Resistor Logic out of its cage

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Ted Yapo wrote 05/02/2019 at 16:33

I sure hope so. I've had quite enough of this solid-state bullshit.

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Yann Guidon / YGDES wrote 05/02/2019 at 23:48

Are you implying that relays are already "passé" ???

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Ted Yapo wrote 05/03/2019 at 20:45

@Yann Guidon / YGDES in my mind, relays get a pass because they need the free space for the contacts to move through. I've never seen an entirely solid-state true relay. The things called "solid state relays" are vile impostors.

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Morning.Star wrote 04/25/2019 at 14:11

Hi Ted :-) Thanks for another double whammy dude. #Starcrete

I've just updated, having managed to make some decent tiles, testing to follow ;-)

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Starhawk wrote 04/22/2019 at 03:25

Oh dang, I've been noticed...

Thanks for the +Like and +Follow. Your own work is humblingly incredible.

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roelh wrote 04/12/2019 at 07:05

Hi Ted, thanks for liking and following #Kobold retro computer project !

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Daren Schwenke wrote 03/25/2019 at 16:30

Thank you for the Like of my #Parametric Box Generator project!

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Yann Guidon / YGDES wrote 01/26/2019 at 00:38

Did you see THIS ???
http://www.leobodnar.com/shop/index.php?main_page=product_info&cPath=124&products_id=295

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Ted Yapo wrote 01/26/2019 at 17:47

Yep, I've seen it. In fact, the ebay seller tested my new scope with one:

https://cdn.hackaday.io/images/3605061545938734859.jpg

Alone, the pulser is not very expensive, but you have to consider the other costs involved. I'd end up buying a new scope with enough bandwidth to measure it, and that would cost a few grand more :-)

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Yann Guidon / YGDES wrote 01/26/2019 at 17:56

I'm getting one pulser (knowing that the BNC connector limits the bandwidth but that will be more than enough for me)

OTOH I wanted to know if you had studied how this particular circuit works, because it seems to use a particular IC... Did you investigate ?

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Ted Yapo wrote 01/26/2019 at 23:10

@Yann Guidon / YGDES I did take a look before. It uses an ADCMP572 comparator to generate the pulses. They're $20 each, which is why I started with the slower ADCMP606 ($6). But, being CML output, it's limited to 400 mV of swing (800 mV differential), which is unlikely to be enough to drive a diode sampling gate. You can push it to 800 mV (1.6 V differential) by not terminating the outputs, but I don't know what that does to the pulse shape. And that sill might not be enough.

The BNC probably doesn't have that much effect. Johnson & Graham's book lists 11 ps as the rise time for a double-crimp coax BNC connector. I wouldn't be surprised if a PCB-mount one is even less.

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Yann Guidon / YGDES wrote 01/27/2019 at 00:41

but then how does it get to 1.2V edges ?

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Ted Yapo wrote 01/27/2019 at 01:11

@Yann Guidon / YGDES That's a bit of a mystery. He describes the design in this thread on the eevblog, but doesn't give too many details.

https://www.eevblog.com/forum/projects/yet-another-fast-edge-pulse-generator/

That's another reason to re-invent the wheel; it's not currently open-source. Maybe the design has moved away from the comparator.

I looked at some 10 Gbps laser-diode drivers that could also serve as pulse generators. Those had programmable output levels.

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Laser Developer wrote 01/24/2019 at 04:00

Thank you for following and liking Open Source LiDAR - Unruly! Please tell all your friends about it and if we can get enough interest we may be able to offer it as an educational kit or complete item :).

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Daren Schwenke wrote 01/17/2019 at 04:36

Thanks for the Like and follow on my #Arcus-3D-E1 - Elephant Printer project. It's been stewing in its current state on the back burner for at least a year now. It should be well seasoned, or burned soon. :)

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Mr. Piay wrote 01/12/2019 at 20:02

Hi Ted, I'm glad my project #RELAY COMPUTING is of interest to you. I hope you will find my project #SANX-I MICROCOMPUTER interesting as well. Best regards, Javier

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roelh wrote 01/01/2019 at 19:12

Hi Ted, thank you for following and liking the #4 bit TTL ALU ! And a good 2019 !

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Dr. Cockroach wrote 12/26/2018 at 10:54

Hey Ted and thanks for the Christmas Like :-) This will indeed be a great year for all of us , I can feel it :-D

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Richard Hogben wrote 12/15/2018 at 15:14

Thanks for liking the 'Not a Hack' project!

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Morning.Star wrote 12/14/2018 at 08:21

Thanks Ted, for another double whammy :-D #Five Cubed

Much appreciated :-)

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