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736  Forum 2005-2010 (read only) / Bar Sport / Re: Rotary mirrors for laser scanning? on: April 02, 2009, 12:01:05 pm
No problem - I thought you wanted to make one. I see a lot of the motorized mirrors in the barcode scanners we deal with - "slot scanners" - the big one's that go into the grocery store lane. You could check out your local people who service these things and see if they got any old ones. I was the "first kid on my block" with a gonzo laser that I pulled out of one of those in the '80's. ;D
737  Forum 2005-2010 (read only) / Bar Sport / Re: Rotary mirrors for laser scanning? on: April 02, 2009, 11:49:01 am
Here's one . . .
738  Forum 2005-2010 (read only) / Bar Sport / Re: Your last purchase? on: November 02, 2010, 09:57:50 am
From ebay . . .

I worked there that year. I practically knew this catalog by heart.
739  Forum 2005-2010 (read only) / Bar Sport / Re: Component prices on: December 25, 2010, 05:21:10 pm
I recently bought a 1967 Allied Electronics catalog on ebay. (I used to work there then.) Looking at the prices for components back then is pretty interesting . . .
2N2222 $3.98 (in a metal can)
1N4148 $0.45
1/4W 5% carbon resistor $1.00 /10pk
12AT7 (tube - remember them?) $1.43

These were 1967 dollars, so I guess we don't have it too bad.
Happy holidays!
740  Forum 2005-2010 (read only) / Bar Sport / Re: TI is competing with the MCP430 LaunchPad on: July 02, 2010, 03:06:09 pm
FWIW received mine yesterday
741  Forum 2005-2010 (read only) / Bar Sport / Re: Your dream electronics lab? on: August 25, 2010, 09:53:54 am
  • Compressed air at your workstations. (Can't live w/o it.)
  • In another post I just mentioned a light colored sheet vinyl for an electronics bench. Keeps boards from sliding around.
  • I painted the cement of my shop floor with a light gray epoxy paint. For woodworking, at least, it sweeps easily. You can get an anti-fatigue mat to stand on.
I could go on and on.  smiley
742  Forum 2005-2010 (read only) / Bar Sport / Re: Workbench suggestions? on: August 19, 2010, 05:58:41 pm
When I was doing a lot of board repair as a tech, I used to use benches with vinyl sheet flooring on them.

The surface is just soft enough so things don't slide around. If you get it in a light color, it's also easier to see small parts.
743  Forum 2005-2010 (read only) / Bar Sport / Re: What was your first OS? on: April 21, 2010, 01:47:19 pm
CPM writing in PL1 (after my Timex Sinclare)
744  Forum 2005-2010 (read only) / Bar Sport / Re: Joke of the day on: May 18, 2010, 03:36:50 pm
Guy: Doc, I think I'm a moth!
Doc: You don't need a doctor. You should see a psychiatrist.
Guy: Yea, I know. But I noticed your light was on.
745  Forum 2005-2010 (read only) / Bar Sport / Re: Anybody drinking mate? on: May 13, 2010, 07:03:02 pm
Ah yes, matè . (ALT 138)
It always made my lips numb. There's a straw like thing to drink it from.
Enjoy the buzz.

[edit]Oops! It was Kava Kava that made my lips numb. Perhaps I need one or the other. smiley[/edit]
746  Forum 2005-2010 (read only) / Bar Sport / Re: Capacitance Education Display on: May 12, 2010, 05:23:34 pm
Any safety issues with shocking kids?

Having just made a  Geiger counter that cranks out about 500V at very low amperage, I can offer a few things to consider . . .

It's impressive to see how well a voltage like that can travel through the body. Holding a wire in each hand or even 2 people each holding a wire and touching fingers - would give me a nice "click" on my pickup circuit.

No shock was felt, but this made me wonder about any affect the HV might have on a pacemaker. I don't know but, I'd check that out.

Also note that due to the very low current (I hope!) the 600V will be impossible to measure with a standard DMM. You will get a lower reading due to the loading. However, it looks like the op-amp takes care of that problem for you. So adjust your HV via the op-amp.

Interesting project!
747  Forum 2005-2010 (read only) / Bar Sport / Re: Coding under influence... on: May 13, 2010, 08:39:30 pm
Florin, I wish we were hiring!

Are you saying they fix and modify things that aren't broken? That is not always a good thing, you know.

In our case it's usually always a good thing, but to explain I have to put it in context. The developers I work with deal with a pretty large application - about 50 man years of development and probably around 1/2 million lines.

During the process of making a mod, one might find things like "magic numbers", spaghetti code, things that need to be modularized, etc. Even though our product is based on a state machine (something that really helps it's stability), as it grows, sometimes parts of the foundation need to be reinforced.

We are a professional shop, and it's generally the developer's responsibility to do unit testing. From there it goes to QA where they do regression testing, functional testing, etc.

As far as the added cost for this, we eat that. But better code usually costs less in the long run.

Sorry! I'm at work.  :-X

748  Forum 2005-2010 (read only) / Bar Sport / Re: Coding under influence... on: April 24, 2010, 01:19:05 pm
Sometimes I find that I code better after a Scotch or two. (Anything else makes me stupid.  :smiley)
However, I also noticed the converse. When life is sweet, I code better.

I no longer code professionally, but I have been leading a team of developers for a number of years. What I have come to believe (some may take offence, and it is a generalization) is that coding is more like creating literature than doing science. Quite often I can get a sense of someones coding style by listening to them talk. In a similar vein, I also like to hire coders that are rock climbers here in Colorado. I found that they code carefully, and tend to leave the code in better condition than when they started, even if it wasn't their code.

Sorry if this is a bit off topic, just curious what the reaction (if any) would be.
749  Forum 2005-2010 (read only) / Bar Sport / Re: SPI Wire Colors on: April 23, 2010, 10:26:10 am
I was just thinking about that the other day - in regard to jumper wire colors.

I always use yellow for the clock (didn't have orange until I bought some cheap-o jumpers) and I use blue for data (I2c).

For serial I use green for xmit and blue for rcve.

It may sound silly or pedantic but often saves me time - and the effort to put on my glasses.
750  Forum 2005-2010 (read only) / Bar Sport / Re: Cutting PCB boards on: April 25, 2010, 12:23:15 pm
A good handsaw to use is a jewelers saw. It's a handy tool to have anyway.
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