Electronics Forum / CAD / November 2004

These are very basic questions, some no doubt in the Duh! category.
FWIW I've read the tutorial, albeit quickly. But a few quick pointers
from the established LT Spice users could save me hours please! Or
maybe there is an existing source for learning practical details which

Please suggest circuitry and power MOSFETs to do the following:
Control voltage > +100mV, turn on P-channel device to +24V (1 Amp *)
Control voltage < -100mV, turn on N-channel device to -24V (1 Amp *)
-100mV <= Control voltage <= +100mV, both MOSFETS OFF.

I am trying to understand the spice3 programming model
I have added new parameters to existing jfet model
by making changes to over 20 files. I wish
to know if there are debugging functions provided inside

I'm looking for a TL081/TL084 Model that accurately models power
supply current.
The models on TI's site are deadly INACCURATE :-(
                                       ...Jim Thompson

John Woodgate?  Haven't heard from him in awhile.  Anyone know if he's
OK?
                                       ...Jim Thompson

Recommendations for Best Book on PID ??
Thanks!
                                       ...Jim Thompson

Hope someone can give me some pointers:
I'm trying to position components on the board in some kind of orderly
fashion, a pattern rather. The most important are the few LEDs , but for the
rest of them I'd also like it to look  good from an aesthetic point of view.

For a few years now we have made available a video
driver for Protel Autotrax (a DOS PCB layout package).
These video drivers run under VESA bios and allow
Autotrax to be used at higher screen resolutions than

I can generate an EDIF netlist of my design. I would like to send this
to a third party which are using Mentor Expedition. Is this possible?
Petter

See the binary at....
Newsgroups: alt.binaries.schematics.electronic
Subject: Is This Realizable? - DriverLoopAC-SIM.pdf
Message-ID: <rb25q09nabs0qvt384ag5ohjgmu78uu5ag@4ax.com>

I'm interested in building a PCB ink resist plotter.  Photo resist is
expensive, and I have about 50 copper clad boards.  What kind of CNC
plotting software is available for Linux?  Will I be stuck writing my
own primitive software?  Although not exactly dealing with electronics,

Whilst carrying out some tests on oscillators, it transpired that one
cannot readily establish the phase relationships of the various
components by means of simulation. To give a simplified example, if
you hook up a sine source, a capacitor and a resistor in series and

Is it possible to coax the schematic editor in LTSpice to place multiple
devices that are in the same package?
For example that would be a quad opamp or a logic chip such as the
CD4007. At least the pin numbers would have to vary accordingly.

last week I started the development and design of a PCB with an FPGA (Xilinx
Virtex 2) and two DDR-SDRAMs in parallel. No big deal, I thought, keeping in
mind the most obvious design rules, i.e. combining the adress lines and
separating the data and strobe (DQS) lines. But now I ...

I have an RF coil. Some material having strong absorption for 100MHz RF is placed  
inside the coil. X", size and position of the absortive meterial is known.
How can I simulate the resistor of the RF coil at the specific frequency of 100MHz?
Thank you very much!