Sharp remote control ceramic resonator frequency?

[Michael Black]

Was that because you had plenty on hand, or was it recommended for
the microprocessor you selected?



**** As 3.579545 MHz is the NTSC colour burst frequency,there are millions
of these crystals around the world.Because of availibility and low cost,they
get used in all sorts of circuits.

Brian Goldsmith.

But if it was recommended, chances are good that it was because they
are common. If there's no need for a specific frequency (because the
crystal isn't being used to supply something else that does need it)
one might as well go with a cheap crystal in the general range desired.

Michael

 

[Michael A. Terrell]

Was that because you had plenty on hand, or was it recommended for
the microprocessor you selected?

**** As 3.579545 MHz is the NTSC colour burst frequency,there are millions
of these crystals around the world.Because of availibility and low cost,they
get used in all sorts of circuits.

Brian Goldsmith.

Gee, Brian, I've known this since the mid '60s. I have a few oddball
color burst crystals, including an early Zenith one in a glass envelope
like a miniature TV tube. I am disabled, but I have worked as a
broadcast engineer at three TV stations. I guess you didn't see the
winking smiley?

 

[Bob Parker]

Hi Brian,
Everyone else answered your question for me! As they said, NTSC
colorburst crystals are very common and very cheap. The firmware in
the micro doesn't need a higher clock frequency than that, so that's
why I chose it.
The micro internally divides the 3.58MHz by 8950 (179 x 50) to
produce a 400Hz reference for all its timing. It worked out pretty
well.

Regards,
Bob

 

[Bob Parker]

Oooops, I was replying to Michael not Brian!

Bob

 

[Michael A. Terrell]

Oooops, I was replying to Michael not Brian!

Bob

How are you doing these days, Bob?

 

[Bob Parker]

Hi Michael,
I'm pretty busy now. I've done what I told everyone I'd never do
again = working for someone else, designing circuitry for engine
control computers (or trying to).
How's things down in 'gator-filled Florida these days? Maybe we
should continue this by e-mail...?

Regards,
Bob

 

[quietguy]

Ahhh go and visit him Bob. If you still have all that hardware in your
leg the gators 'll only break their teeth

David

 

[Bob Parker]

G'day David,
You sure do pop up at the least expected times!
(1) Florida's further from Sydney than you might realize.
(2) There are only 2 screws in my leg now, so I wouldn't trust that to
protect me from 'gators. Do you realize that believe it or not, it's
30 years ago in just over a month from now, that they put all that
stuff in my leg? Where does the time go???

Bob

 

[Michael A. Terrell]

Ahhh go and visit him Bob. If you still have all that hardware in your
leg the gators 'll only break their teeth

You would be surprised what a gator can bite through. I've seen cars
on the Orlando TV stations where a gator bit a chunk out of a car or
pickup truck. One man left his tailgate down on his truck and had a
gator in the truck bed the next morning. he had to wait for the state
to send a licensed trapper to remove it and take it to the Everglades to
release it.

David

Not many gators in Marion County, but there were plenty about 30
miles south of here at my old house in Lake County. It was a common
sight to to see a gator run across the yard heading to or from the marsh
behind my workshop.

I'd like to meet Bob. I think he's almost as crazy as me!

 

[quietguy]

He's a great bloke to work with - good tech and laugh a minute. But if the
bugger ever offers you a cup of coffee be sure to check the inside of the
mug handle - you never know what you might find there

David

 

[Michael A. Terrell]

He's a great bloke to work with - good tech and laugh a minute. But if the
bugger ever offers you a cup of coffee be sure to check the inside of the
mug handle - you never know what you might find there

David

No problem! I don't drink coffee. I've talked to him by e-mail for
several years and I think he's an OK guy.

Maybe I should send him a small gator to fatten up for Phil?

 

[quietguy]

Hey, fair go. We have animal cruelty laws here you know

David

 

[Bob Parker]

Now David, you know that I would *never* stoop so low as to play
practical jokes on anyone!! Thanks for telling nice lies about me,
though.

Bob

 

[Michael A. Terrell]

Now David, you know that I would *never* stoop so low as to play
practical jokes on anyone!! Thanks for telling nice lies about me,
though.

Bob

How about "Impractical jokes"?

 

[Michael A. Terrell]

Hey, fair go. We have animal cruelty laws here you know

David

It wouldn't work anyway. The gator would get one taste and spit him
out.

 

[quietguy]

Hey Bob, send me a $1.33 in used notes and I'll keep quiet

David

 

[Bob Parker]

Hey Bob, send me a $1.33 in used notes and I'll keep quiet

David

OK, I'll do that!
Or maybe I could tell them about the time you got someone to hang
onto the exposed ends of the wires coming out of a plug you inserted
into the 240V power outlet, and were about to throw the switch....?
Now that is something I'll never ever forget!

Bob

 

[quietguy]

The look on your face as I hit the power switch was priceless - and when
the apprentice (who was holding those leads) hit the floor I thought you
were going to freak out!

David

 

[Bob Parker]

Ahhh, now you understand the motivation for some person (not further
described) sabotaging your coffee mug!!

Bob

 

[Mark]

So what frequency was it after all?
Mark