Electronics Forum / Basics / September 2007

i was re-checking the specs on the A618SEP replacement for my
SN75518N ....
advertised as drop in replacement
and i noticed that the minimum clock for A6818 is 10 MHz @ 5v

I need to use a router in order to save 50 bucks a month for an extra
DSL line. The problem is that the router will be in one building while
the computer will be in another that's about 300 feet away. There is a
pretty open area between the buildings and I'm out in the woods. Can

I am experimenting with an Instek oscilloscope. I have two sources.
One is an audio output from the laptop, and another one is a tone
output from a function generator.
This is a video of the laptop output:

I am new here and this is my first post. I need some clarifications
regarding how electric test pen basically works. I've done googling on
the web but can't find the informations on how it works. Hence, I come
up with my own theory and I hope to see some feedbacks.

A small open-frame line powered power supply (Cincom CFM05S033) doesn't have
a ground connection.  It will power a tiny device which only has +3.3V/0V DC
connections.  This will be used in a 6x6x4 plastic enclosure so there is no
chassis ground.  An electrician will be wiring it ...

I have a series of120V  latching smoke detectors installed in my home
for which the latching signal appears to be a drop from 120 to 110
volts in the latch line. At least that is the only signal I can detect
when one of the detectors is activated.   I would like to be able to

Can someone who is familiar with Tesla's wireless transmission of
power explain how this was to be achieved? I have a lot of info but I
can't get a coherent picture.
Magnifying Transmitter (TMT): Would this apparatus transmit power

I'm designing my first battery charging circuit for a device and need
some assistance.  As a preface, I am charging a 3.7V 850mAh Polymer
LiIon battery from a 5V wall-wart through a MAX1555.
I have a battery charge circuit and I have the rest of my circuit

I am able to take the digital out-put data (X,Y,Z axis) from my
accelerometer and save it to an Excell file. I can plot the data using
but can't get a real good feel for what is really going on with the
movement of the accelerometer. Is there software that I can down load

Hi again group. Have a friend that has coons and possums that are
messing with his swimming pool. He set up a motion sensor to turn a
110v sprinkler valve on, and wants it to stay on for a minute or so,
but the water keeps on "falsing" the sensor. I am trying to come up

My son lives in San Francisco, and would like me to re-wire some of his
house. It's pretty old and he says it has knobs and tubes wiring. What is
that, and how difficult would it be to replace whatever is there with
current outlets, and maybe upgrade his entire electrical ...

http://funnyandcoolvideos.blogspot.com/2007/09/nikola-tesla-biography-7-videos.html
Very interesting documentary about Nikola Tesla

My son just moved into an older house  near his college. We're told
that the electricity isn't entirely reliable and that he should use a
surge protector.
The house's plugs aren't grounded. Will this affect the efficacy of a

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I am new here and this is my first post. I need some clarifications
regarding how electric test pen basically works. I've done googling on
the web but can't find the informations on how it works. Hence, I come
up with my own theory and I hope to see some feedbacks.