Electronics Forum / Basics / August 2007

What are the ramifications for sending a non-CE marked device to
Europe? The device clearly carries no CE mark.
In general, whose problem is it, me, or the person who receives the
item from me?

i am trying to make an oscillator that I can plug into a guitar amp
(or keyboard or bass amp).  i made an oscillator, but the amplitude of
the signal is way too big, 9 volts, i was wondering how i could bring
this signal down to the millivolts level (i think that's typical for

I a bit new to electronics, about 1.
Now I'm learning about coils, and have a few questions.
I have some coils and I know their Henry rating, I've found a lot of
information on coils.

I'm getting started with the study of operational amplifier. Fist of all,
do you know any site which could explain clearly this matter? Could you
write some link?
In particular, I can't understand the reason why a saturation occurs when

I have a Xantera 600HD Power Pack and decided to try it out for a situation
I might want to use it in. I wanted to see how long I could run a VCR and
Epson S3 computer projector. I put in a tape 30 minute long and ran the two
devices for 20 minutes. At the end of that time, I ...

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I'm currently studying mechanical engineering, but I want to focus
more on the robotics side of things.  I'm looking into different
microcontroller starter kits and I was wondering if anyone had any
recormendations.

The system I'm studying has
integrator made of op amp(PA85),and  they made additional
circuit for offset error adjustment with OPA277.
However,I've never seen the mechanism behind the circuit before.

I am building a gas mixer for gopher control.  The mechanics of the gas side
have been taken care of with double flashback arrestors in each line ($100
per line) and premium Whitey 90 degree valves.
What I need is a piezo igniter, but one that gives more than one spark.  I

I have very basic knowledge in electronics.
I am currently looking to build myself a passive simple line mixer. This
is why I read carefully the two pages from Tomi Engdhal at
http://www.tkk.fi/Misc/Electronics/circuits/linesum.html and

Can I model a 100% charged lead acid battery as a store of X coulombs
and use a microcontroller to integrate the current out through a shunt
or hall sensor to keep track of depth of discharge? Or is there some
other tricky factors to consider?

I'm trying to understand a system with rf circuit.
I found that there is a concept called "groundloop"
I searched it at the Wikipedia, but I don't think I now know it.
How can I explain the concept?

Does anyone know if the input offset current of an op-amp drifts with
temperature? Or will it stay within the +/- rating of the datasheet
spec while the input bias current drifts vs. temperature?  I think
JEFT and MOSFET bias currents from gate leakage double every 10°C?

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I GOT CABLE ONE DAY AND I WAS TRYING TO FIND SOMETHING TO WATCH AND I
WATCHED MTV FOR ABOUT 2 HOURS THEN I GOT A BOWLING BALL AND THREW IT
THROUGH THE SCREEN AND TOOK THE BOWLING BALL AND BROKE THE CIRCUIT
BOARD AND BROKE THE CABINET. I CALLED MY CABLE COMPANY AND TOLD THEM