Re: Calculatating RC parallel and series impedance networks.



Iain Churches wrote:

"Patrick Turner" <info@xxxxxxxxxxxxxxxxxx> wrote in message
news:483690D7.7030E1F3@xxxxxxxxxxxxxxxxxxxxx


Iain Churches wrote:
You don't seem to be able to run Excel.

I don't have a clue if I can or not.

My PC is a 2003 model with standard domestic Windows XP.

Does it have Microsoft Office or Open Office installed?
Without the programmes the spread*** cannot run. Just as
you can't play a vinyl disc if you haven't got a turntable.


I did a search on the PC for Windows Excel and Microsoft Office, and
no files with those names are on the PC.

No wonder the spread *** appeared like a dead cat.



I do not want to have to pay for a special program ability to calculate
RC network Z values, because the formulas I have are from old books and
my brain combined with a
pocket calculator does very well thank you.

How long does it take you to calculate the Z of a CR network at
every F between 10Hz and 100kHz, and then draw the result on
log graph paper. The spread*** can do it faster than you can press
Enter select the tab and then Print.

Sure, but only for the series of parallel network.

There isn't any allowance to add in a whole circuit.

I measure and graph a typical amp response in an exercize book
with pencil and in 5 minutes.

I have to measure REAL performances.

If I do have to actually know the Z value for the series or parallel RC
I just work it out, but mostly I don't have to know the Z value
right across a band, mainly just where XC = R.

I know what happens to the Z RC above and below the F where XC = R.

Knowing what I know is enough.
I get splendid results with the networks I use.




That's what I did and the PC went through motions of instalation
and saving in my audio technical folder in a newly created file for it.

I open up the downloaded file and the window displayed as it should
have, but
It wasn't active. Just as useful as a dead cat.

Hmm. No one else seems to have had any trouble. Do you
have Microsoft Office or Open Office installed?

No.

If its too much trouble, I delete the damn thing, and
carry on as I have for years without it....

That's a rather a Luddite attitude, but I agree with you.
I still use a bench signal generator and dedicated instruments
for test rather than any PC based software with narrow
bandwidth.

I like mucking around with amps or being out on my bicycle.

Sitting glued to the PC to perform in hours what i do
in 20 seconds in the workshop doesn't make my life easier.

Once again. The whole idea of the spread*** was to
give very fast printable results, that can be kept for
reference or compared.

The PC is a slave to me; I am not its slave.

Thats just as it should be:-)

I try to minimize the screenization of my lifestyle.

Patrick Turner.

Regards
Iain
.