sci.electronics.design Google Group

Re: Non-linear functions ...

2009-11-26T20:46:11Z

It might be worth dividing down the input voltage to allow the 6.02V
reference to be the same as the output reference (eg. FF power supply)
which I assumed to be 5.00V). Then a series 5V 0.1% reference like the
ADR395 could be used and a 1% NP0 cap. Stray capacitance would require
a bit of fiddling to compensate for, but it should be pretty darn

Re: Ping Bil Slowman; The global warming hoax reveiled

2009-11-26T20:34:43Z

On Thu, 26 Nov 2009 18:32:43 +0000 (UTC), d...@manx.misty.com (Don
Methane has begun rising, again.
The Copenhagen Diagnosis:
"The concentration of methane (CH4) in the atmosphere increased
since 2007 to 1800 parts per billion (ppb) after almost a decade
of little change (Figure 2). The causes of the recent increase in

Re: Non-linear functions ...

2009-11-26T20:09:28Z

Fred Bartoli a écrit :
Argh... And also don't forget to shift the 6.02V by one volt too and
make it 7.02V, which makes the resistor's secret value 4K14

Re: opinions on salary/job prospects on the east coast

2009-11-26T20:09:42Z

Take the 62K. I have a friend who has a mid sized company in Florida
that makes HV power supplies, he says there are more EEs in Florida
then Florida needs and the going rate is low. And get the numbers up,
I had to take a 40,000K job at a friends company as a R&D tech,after
being downsized, and that doesn't really leave any fun money after

Re: Non-linear functions ...

2009-11-26T20:10:36Z

On Thu, 26 Nov 2009 19:39:20 GMT, n...@puntnl.niks (Nico Coesel)
wrote:
Matlab etc. (if you have it) or Excel can help with this kind of
design. I took the solution to the diffeq for capacitor charging from
an intial voltage
v(t) = Vf * (1- exp(-(t-a)/tau))
and fit that to the data points to find a, Vf so as to minimize the

Re: A small rant about the 555 :-)

2009-11-26T19:51:22Z

On Thu, 26 Nov 2009 11:53:13 -0700, Jim Thompson
...and whine. Like the rest of his miserable life, it's all he can
do.

Re: Ping Bil Slowman; The global warming hoax reveiled

2009-11-26T19:48:41Z

On Thu, 26 Nov 2009 10:26:45 -0800 (PST), Bill Sloman
---
PKB, Mr. "I can extract energy from the variable magnetic field
surrounding a conductor carrying an alternating current by wrapping a
solenoid around it."
JF

Re: Non-linear functions ...

2009-11-26T19:39:20Z

I use Excel for that purpose. If you choose an X-Y graph you can
choose to show a math approximation.

Re: Ping Bil Slowman; The global warming hoax reveiled

2009-11-26T19:40:59Z

On Thu, 26 Nov 2009 18:32:43 +0000 (UTC), d...@manx.misty.com (Don
The wikipedia article quotes IPCC numbers. Unfortunately anything from
the IPCC is suspect given that Mann/Jones et al seem to have acted as
bouncers for the consensus.

Re: Help with noisy HV supply

2009-11-26T19:33:56Z

Others have commented on the 9V line - add a 470 uf electrolytic,
isolate with 100 ohms, bypass with a small cap, all of which
help to reduce fluctuations on it. In addition, use a voltage
regulator to keep the line at +9.
Another technique to isolate Vcc: run the 9v supply directly to
the transformer, and through a diode to supply Vcc to the 4017

Re: Ping Bil Slowman; The global warming hoax reveiled

2009-11-26T19:33:10Z

On Thu, 26 Nov 2009 09:36:14 -0800 (PST), Bill Sloman
---
Then nothing you post would lead to the creation of a consensus.
JF

Re: A small rant about the 555 :-)

2009-11-26T19:23:45Z

On Thu, 26 Nov 2009 08:53:23 -0800 (PST), Bill Sloman
---
It's not a defect in my expertise because it simply isn't true, as I've
pointed out often enough for someone with a reasonable attention span to
grasp.
You, however, with your belief that if you repeat a lie often enough
it'll magically turn into the truth, aren't that someone.

Old noise generator

2009-11-26T18:58:39Z

This is an Elgenco 331A gaussian noise generator. I know very little about
it, though I did see an ad in an old journal proclaiming it's good to four
sigmas. It seems to be roughly "audio frequency", by which I mean, the
circuits are audio quality, no particular attention paid to high or low
frequency bandwidth (AC coupled, no peaking coils). I would guess 10Hz to

Re: OpAmp compensation

2009-11-26T18:53:13Z

On Thu, 26 Nov 2009 10:40:10 +0100, Remco Poelstra
A good book on opamps can be found at
[link]
There is a chapter on compensation.

Re: A small rant about the 555 :-)

2009-11-26T18:53:13Z

But Slowman gets to watch ;-)

...Jim Thompson