"Standard parts" for rf amps?

Try them on a toroidal inductor, even at HF. I have good reason to believe they won't have anything like a model to predict self capacitance/resonance.

vy 73

Andy, M1EBV

Spice is as good as the input is! Spice is not a Maxwell field equations solver!

You can predict within 5% without Spice?? How?

- Henry

"Andy Cowley" schrieb im Newsbeitrag news: snipped-for-privacy@bath.ac.uk...

your

Sure Jim. I understand you. That was the time where time was cheaper. Once I programmed a Gauss linear equations system solver on my Casio FX-602P - having 512 bytes and even left one byte (for extensions ;-) It was with minimal input help system (Showing the indices to input) and the matrix was of dynamical order. (Sorry for my bad english)

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%. And then you add the active components with horrible semiconductor strayung values. Of course, it is possible with feedback structures to linearize and stabilize such systems. So, where is the difference between measurement of the component values and calculating by hand the circuit OR setting the measured values in the Spice component dialog boxes? The difference is the time needed and the possibility to make errors.

Hey Jim - Why you don't answer my second private message? :-(

- Henry

"Jim Thompson" schrieb im Newsbeitrag news: snipped-for-privacy@4ax.com...

The NE85633 bipolar transistor from California Eastern Laboratories (CEL) ! very cheap quite stable and with a good noise figure. very well documented by the manufacturer! try to fish a development kit of SMD coils from Murata, sometimes they give them away for free. I personally prefer to go with air wound inductors, they're better and quite small at these frequencies. Saandy 4Z5KS

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

Thanks Saandy! I knew CEL but forget them ;-)

Seems the NE85633 is really cheap and good performance. The package is reasoable for hobbyists. Do you already converted the parameters to spice and is it possible to provide the file to me? Thank you!

Should be a good oscillator and all-purpose amp...

Sure, plain wire is better than the manufactured coils if possible to apply.

cu - Henry

"Saandy , 4Z5KS" schrieb im Newsbeitrag news: snipped-for-privacy@g43g2000cwa.googlegroups.com...

Sorry. I found the needed file at CEL website by searching for part number.

- Henry

"Henry Kiefer" schrieb im Newsbeitrag news:43971923$0$9633$ snipped-for-privacy@newsread2.arcor-online.net...

apply.

You have undergrads select them. :-)

Cheers! Rich

For example

- Henry

"W> >

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: snipped-for-privacy@example.net...

typical

elusive

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.

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.

Henry,

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

For timing purposes I suggest using a ready-to-use clock generator in tiny SOT-23 or alike. For example from

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

- Henry

"W> >

Here it is Joel:

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

- Henry

"Joel Kolstad" schrieb im Newsbeitrag news: snipped-for-privacy@corp.supernews.com...

is

note

concept -

Like snot???

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

Merry Christmas to all!!!

-Bob

Turns out that if you really want micropower sinewave oscillation at