Henry Kiefer wrote...

I can buy resistors and capacitors with 5%, sometimes with 1%.
If you build a RC oscillator with 1% component values, you get
an error typical 1,5%.

I have a nice line of 2% caps in stock, but where do you
get the elusive (affordable) 1% capacitors?


--
Thanks,
- Win

On Wed, 07 Dec 2005 16:05:19 -0800, Winfield Hill wrote:

Henry Kiefer wrote...

I can buy resistors and capacitors with 5%, sometimes with 1%. If you
build a RC oscillator with 1% component values, you get an error typical
1,5%.

I have a nice line of 2% caps in stock, but where do you get the elusive
(affordable) 1% capacitors?

You have undergrads select them. :-)

Cheers!
Rich

OR two capacitors in parallel. The support cap has a nominal value of 1/100
of the bigger cap. So you can tune the bigger.

- Henry


"Rich Grise" schrieb im Newsbeitrag
news
On Wed, 07 Dec 2005 16:05:19 -0800, Winfield Hill wrote:

Henry Kiefer wrote...

I can buy resistors and capacitors with 5%, sometimes with 1%. If you
build a RC oscillator with 1% component values, you get an error
typical
1,5%.

I have a nice line of 2% caps in stock, but where do you get the
elusive
(affordable) 1% capacitors?

You have undergrads select them. :-)

Cheers!
Rich

For example http://www.wima.de/fkp2.htm
But I think there are other manufacturers too.

- Henry


"Winfield Hill" schrieb im Newsbeitrag
...
Henry Kiefer wrote...

I can buy resistors and capacitors with 5%, sometimes with 1%.
If you build a RC oscillator with 1% component values, you get
an error typical 1,5%.

I have a nice line of 2% caps in stock, but where do you
get the elusive (affordable) 1% capacitors?


--
Thanks,
- Win

I have a nice line of 2% caps in stock, but where do you
get the elusive (affordable) 1% capacitors?

Digikey stocks a handful of Panasonic ECQ-P(Z),
POLYPROPYLENE, Radial, 0.001 to 0.47 uF.

Not a great selection, but probably good enough for
many timing applications if you do the fine tuning with
the size of the R.

--
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Hal Murray wrote...

I have a nice line of 2% caps in stock, but where do you
get the elusive (affordable) 1% capacitors?

Digikey stocks a handful of Panasonic ECQ-P(Z),
POLYPROPYLENE, Radial, 0.001 to 0.47 uF.

That's good to hear of, thanks! The 2% parts I have in stock
are the same series, but cheaper 2% parts. I didn't realize
DigiKey carried so many 1% film capacitor values in stock.


--
Thanks,
- Win

For timing purposes I suggest using a ready-to-use clock generator in tiny
SOT-23 or alike. For example from www.linear.com and www.maxim-ic.com
They have a accuracy well in the 2% range and can be tuned with a little
resistor 1%. Maxim sells a 32768Hz variant - crystal controlled.
They're all digital ouput!

Building a 32KHz oscillator with a clock crystal and having sinus output is
really simple with CMOS buffers.
You can mix the signal with RF getting an IF somewhere. Look at the app note
at www.cypress.com how to build a time-code receiver using that concept -
just of the cystral and cypress mixed-signal controller.

- Henry


"Winfield Hill" schrieb im Newsbeitrag
...
Hal Murray wrote...

I have a nice line of 2% caps in stock, but where do you
get the elusive (affordable) 1% capacitors?

Digikey stocks a handful of Panasonic ECQ-P(Z),
POLYPROPYLENE, Radial, 0.001 to 0.47 uF.

That's good to hear of, thanks! The 2% parts I have in stock
are the same series, but cheaper 2% parts. I didn't realize
DigiKey carried so many 1% film capacitor values in stock.


--
Thanks,
- Win

Henry,

"Henry Kiefer" wrote in message
...
Building a 32KHz oscillator with a clock crystal and having sinus output is
really simple with CMOS buffers.
You can mix the signal with RF getting an IF somewhere. Look at the app note
at www.cypress.com how to build a time-code receiver using that concept -
just of the cystral and cypress mixed-signal controller.

I don't suppose you have the name and/or number of that application note? I
did a little searching without success to find it.

---Joel Kolstad

Here it is Joel:
http://www.spectrum-benelux.com/docs...radioclock.pdf
(Seems that it is not on the cypress site)

If you realize something with the PSoC, then I would like to hear from you.

- Henry



"Joel Kolstad" schrieb im Newsbeitrag
...
Henry,

"Henry Kiefer" wrote in message
...
Building a 32KHz oscillator with a clock crystal and having sinus output
is
really simple with CMOS buffers.
You can mix the signal with RF getting an IF somewhere. Look at the app
note
at www.cypress.com how to build a time-code receiver using that
concept -
just of the cystral and cypress mixed-signal controller.

I don't suppose you have the name and/or number of that application note?
I
did a little searching without success to find it.

---Joel Kolstad

Henry Kiefer wrote:
(Snippage)

Building a 32KHz oscillator with a clock crystal and having sinus output is
really simple with CMOS buffers.
Like snot???

(more snippage)
Sorry. I couldn't resist it.

Merry Christmas to all!!!

-Bob