EEVblog #643 - Mailbag

Mailbag Monday

Spoilers:
Dual input power selector circuit, the Pow-OR:
Casio FX-7000G the world's first graphing scientific calculator, circa 1985.
A 1989 vintage analog ohmeter.
Teardown of a Clipsal 32E450UDM 450W electronic dimming module.

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[mjlorton]

Hats off to Mark for asking for and braving a Dave critique. A great learning opportunity for many of us.

[mousebitefever]

Thank you for the critique. You gave me much more time than I expected.

I have since uploaded the schematic to the github in PDF and PNG format (sorry about that).

The pot choice was more one of my attempting to pitch it to SparkFun. They had that pot in their catalog already so it was optimizing for their manufacturing. In previous versions I had wanted to use surface mount pots but there was a question of their rotational life. I was hoping to have this be for beginners like myself so I figured they would be turning it a lot.

I am going to look into moving the SMD and through hole parts to opposite sides like you suggested. Also I'll see what I can do about directionalizing any shields.

As for the soldering that was just a dab of solder paste and some hot air work. I'll make sure to put more on in the future.

Again thank you I appreciate the gentle but frank review, and I'll keep you up to date going forward.

EEVBlog forum member: Dteck
but I might make one just for MouseBiteFever

[frankschieschke]

Hi Dave,
i think the parcel was hardly dropped. It looks like the pointer is bended to the left.
So the zeroing screw can not work properly. Before i send it, i adjust the pointer to zero.
Frank

[beachsandinspector]

Love the new format of the video.
lots of interesting stuff today, the dimmer was a bit of a surprise more electronics in there than my old camera

[MrCarlsonsLab]

Like the new bench Gives you a better presentation too with all the test gear behind you. Looks good!

[redtails]

13:59 yeah, I definitely got to like this setup with newsreader-style opening of packages, then dedicated product-viewing from above as usual, it's nice and probably easier for you too so you can sit down sometimes

[DJSolitone]

New video format of the mailbag is really great Dave. The new bench allows us to see your face expression when opening the mail... Fantastic !!

[shamanjoe]

I'd be completely nervous to get a Dave critique too, but I know I'd learn some awesome stuff in the process!

[squelchedotter]

Hey some German lessons: ß is not a B, it a sharp s, pronounced similar to the ss in "mass". Also, interestingly, the instrument is manufactured by the "Stateowned Klingenthal harmonica factory". The street name is "Lenin street" (so, yeah, east germany), pronounced "lehnin shtraasse" or something like that.

[SatyajitRoy]

New setup is much better. Thanks for all of your efforts in enhancing the view with your innovation!

[bluefoxtv]

I like the new setup. Its nice to see your face when you open the packages. 

[Brainboxen]

I like the new format. It makes the video seem more personal, and the backdrop full of instruments fits the theme of your show very well.

[DJignyte]

Like the new setup, Dave.
Keep it up!

[elmin]

2nd love the new format with the different cameras! ✌️👍👌

[Razor]

Both methods of shooting the video work great. I would say go with which ever method is easier for you.

[TradieTrev]

That was a really good critique Dave. Not harsh but to the point; Hat's off to you... The new setup is great and my opinion would be harden the fuck up haha. 

[winstonsmith]

Like the new format. Very professional.

[JoshuasRecordings]

I actually like this format better. Thanks for sharing. First comment, that never happened before except on my own videos!!

[Petertronic]

On the Ohmeter the pointer looks like it might be bent at the coil end, carefully bending to the right might restore full scale deflection. It may have been dropped or something. The new mailbag format is a good improvement.

[excavatoree]

I like your more aesthetic arrangement of your "storage" test gear.  I'm glad you mentioned it soon in the video, as I was just about to ask if it was deliberate.