Catwalker

 Well, it's been a while, finally got around to getting this soldered together and in the aluminium box. When I ordered the box, I didn't realize it didn't split in half, so, it was fun getting the small board in there. I'm guessing the box is designed for slightly larger boards, which slide into the slots. Oh well. It's together, now for the arduino (which is basically functioning as an a/d converter, the Pi (which will do the display) and software. This could take a while.

 

 

 

 

 

 

 

 

 

 

Later... :)

じゃまた

Onward and upwards! ;)

The next project is a QRP SWR bridge...
But, what's so special about that? An swr bridge? You may ask...
Well, nothing special about the bridge itself, it's a simple
Stockton Bridge based on this schematic:














The original article can be found at this link: SWR Meter


Which is why I haven't bothered covering the construction
of this part. You can see the completed board in the below
photo with a curious part.
 

 

 

You'll see a DB9 connector underneath the left SO239 connector.
This is going to connect to an Arduino, instead of an analog meter.
With the Arduino simply acting as an A/D converter with the
destination of the digital signal being a Raspbery Pi...

Stay tuned.

(See what I did there? ;) )

じゃまた

So, here is my clone of the Heathkit HD1416.
The construction was quite successful and works well, but,
the construction was so, so simple, I would be embarrassed if it didn't
work and work well. It just needs a case now.

 

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Well, this is embarrassing! My first post of 2020 and it's April 24th!
Oops. Well, time for an intermediate project or two, before I carry on with the limited space antenna and figuring out just how well it's working.











This is a schematic of a Heathkit HD1416 Code Practice Oscillator.  I bought the actual kit around 1978, probably still have it somewhere, but packed away, and I needed a CPO in order to do some testing. So I decided to build one. I still have the complete manual (which is downloadable off the web - not from me - you can Google it.) This is the second clone I've built of this. I built one for a local ham (now long deceased) for him to give to a young fellow he was encouraging to become a ham.

The circuit is an astable multivibrator consisting of Q1 and Q2, the output being fed into a transistor audio amp, Q3.

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Well, 2019 is quickly drawing to a close, it feels like only yesterday that 2018, and 2017 before it were quickly drawing to a close. My how time flies faster and faster as you get older.

Happy New Year Everybody!

新年あけましておめでとうございます！

Merry Christmas, all!

皆さん、　メリークリスマス！

Not the number kind, but finger kind...

I love watching how-to videos on Youtube, I think it's actually an addiction...
But, I am seeing things among carpentry videos and metal-working videos which make me cringe. Safety, or a lack thereof... I wonder how many of these people will be missing portions of their hands in the future?

Get safe, pay attention, and THINK BEFORE cutting!

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Wow, I've actually written more postings this year than last! :)

Things are looking up. I hope to get a few more posts up before the New Year. Maybe a couple tied in to my Youtube channel. (Located here: number6of1) Keep your eyes peeled - I want to get my latest project complete and up here in the next week or so.

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I once made the mistake of calling boxing barbaric to someone who was obviously a boxing fan...
Well, once again, I have been proved correct.

27-Year-Old dies of traumatic brain injury in the ring...

I stand by my statement that boxing is barbaric.

A sign of human depravity.

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Here is what LTSpice says the response should be...

Not that different from what you see on the scope in the previous post.



















Of course, LTSpice assumes perfection in everything from parts values to wiring to solder joints...

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