Electronics Forum / Design / November 2005

Just got some samples of these very nice Delta-Sigma A/D converters,
complete with built-in amplifiers for a new project.
A quick bench lash-up hooked to an AVR processor development system
shows promising results when used direct with a gain of 64 ( I have a

I gave it a try, specified my power supply and let it run. It outputs a
schematic and a BOM but there is no explication how it selected the
components. You have to look up all the datasheets to figure out why it did
pick a certain component. When you start a simulation it is soooo ...

I'm a newbie and am needing some help understanding how remote controls
(RF in particular) work.
The device to be controlled:  RS-232/TTL controlled mp3 player
Remote control: RF based with number 0-9, pause, mute, volume+ and

I am the "lucky" owner of a number of older UPSes.
So what can a person build out of these?
The batteries are for the most part dead but the remainder of the
components seem to be in good condition.

Wanted: Older GI 1979-1985 PIC1665 microcontrollers.
Also looking for any old PFD 1020 Field Demo Systems from GI.
Email me if you have any of the above, thank you.
Curt

I would very much like to make some sort of a "peak voltage
detector". A device that, when plugged into a circuit, after a
while, builds up an adequate representation of peak voltage. That
would be again for my IGBT inverter.

Just curious about something. Let's say I have some wires that I want
to protect from EMI. Can I simply wrap them in aluminum foil? (and
then put some electrrical tape over foil to just keep it all
together. Would it offer me decent EMI protection?

Ever misspelled "complementary transistors"?
http://www.abiengr.com/~sysop/images/comptran.gif

Cheers!

i need an informatio about rs485:
I need to watch netwrok trafic from my device and another device that
use rs485  to comunicate. Is possible to connect in parallel mode
another peripherical (like a pc via rs232) to trace all the message

I'm trying to design a 2nd order loop filter for a PLL but I'm running
into difficulties following the analysis in National Semiconductors
Application Note AN-1001.
In the App note, they find that the time constant T1 of the loop filter

We were getting quite a few shorts on our caps and boards due to tin whiskers.
we resolved the problem by conformal coating. Just wondering if anyone else has
this problem and how did you solve it?
Thanks in advance.

Can anyone suggest a drop-in replacement for the now obsolete Xicor
X22C12P 256x4 Non-volatile 18 pin SRAM? Or, maybe a reliable obsolete
IC supplier in the UK that might be able to help.
Thanks,

On a modern PC what is the best resolution I can get from reading the clock?
I need to timestamp data packets.
Ideally I need sub millisecond res.

I decided to try to estimate peak voltage in my circuit, by connecting
a 2 uF capacitor in series with a diode to my DC bus. The hope was
that the capacitor would be only charged and never discharged.
I removed varistors from the system.

I'm not an experienced electronics person, and so have a "stupid question".  
I have a device that provides an "on" signal intermittently at 2.7 volts DC.  
When the "on" of 2.7 volts is available, I need to have a "sub-circuit"
receive an "on" of 5.0 volts.  I have a source of 5.0 ...