Electronics Forum / Basics / August 2007

I have a question for the group...I have built inverting and non-inverting
Schmitt Trigger with symmetrical and asymmetrical trigger points using an
LM741 op-amp with no problems. I would like to make these same circuits
using a single supply op-amp, like the LM324. Is this ...

I work at a manufacturer of industrial computer systems. Circuit
boards and IC's are regularly handled. In my department there is a
"bug zapper" How potentially harmful is this? Please assume it is the
world's most powerful "bug zapper" :)

Hy guys,
Hope all of you are doing ok....
I'm a newbie in mciro-electronics, alrhough I have an electronics course,
i've never worked with PICs before...

I'm trying to message a transducers time of flight. The transducer has
two leads and has an operating frequency of 40 kHz. I would like to
see the reflected wave vary when I move the target with respect to the
initial pulse . I just don't know how to setup my equipment to do

I was doing the sine to square converter with op-amp comparator LM339.
During the course i was stuck with a problem. The configuration of the
circuit is the sine wave (+/- 10V) was given to the inv. i/p and the
reference voltage of around 0 V was given to non-inv, i/p. To bring

I was just wondering what the best type of capacitor I should use for a
back-up application (> 5uA).  I am looking for something surface mount
around the 100-330uF range with a low profile and as cheap as possible. Any
suggestions?

sir i want to read  and use in practical so i hope that u send mail
data over electronic basics and repairs.

I have a concept that may be viable and need someone who knows
electronics way better than I do to see if it will fly.
This thing will have a variable AC voltage input that will go through
a diode bridge to be converted to pulsed DC.

we donnot see the tv in dark rooms.
because it will effect the eyes
 but in theaters why they are seeing the dark rooms

I have a PVR (something like Tivo) connected to my home theatre system
that can connect to an external USB hard disk for storing movies.
I bought an external hard drive and connected to my PVR and things are
working fine. The only problem is as soon as I connect USB drive (On

I overheard someone speak of rail to rail voltage but I do not understand
what that means. I did a search on the internet but could not come up with
useable information. So in electronics, when someone speaks of "Rail" what
do they mean?

Which one of these three solutions is the best for the best light intensity?
http://img329.imageshack.us/img329/5950/solucijenw2.jpg
More info:
source voltage - 12V

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

..........anyone know if its any good?

I am using 74hc14 to produce a fixed tone.
However, the output keeps varying the low values around 1 khz.
Could anybody please refer to a similar simple circuit that will keep
the hz value stable.