Electronics Forum / Basics / February 2006

Is a Tri State "driver"(I think thats what its called) basicaly a device
which lets you set either Low Z or High Z?
something like
       C

My major is Computer Science but I am working on a project that
involves much about video signals. I have verly little knowledge about
the video signal standards and formats. I need a clear explanation of
how NTSC/PAL/SECAM the broadcast standards are related to the video

I have a question on the currents in the PN Junction diode. This has
been bugging me for a lot of time.
When the PN junction is forward biased, how does the holes from the
P-type move into the N-type ?

I will be the first to admit that I am a bit of nerd in loving to know
how things work. I also love music so I know much of how the music
world works. I was sitting at the computer with guitar in hand looking
up when I noticed some interference. I know that a guitar pickup works

I am looking for a simple circuit for eliminating ground loops on
various audio circuits (max is headphone-type power, say 2 watts).
I could use 1:1 audio transformers or 0.1uF caps.  What are the
advantages/disadvantages of each?

hi there!!!
Greetings,
i want to ask from the group how to make a bipolar capacitor out of two
polarized electrolytic caps. For example, I need 10uf bipolar cap but i

This is a follow on from my previous post regarding +- 15 V regulated
supply. As per suggestion from this good group - I built a positive
supply using a LM 723. Works fine.
Now, I have added an inverter follower using an NE5534 op amp. Why

What do we mean by saying that the spectrum of rectangular pulse is
sinc(x) function?

Dear,
I want to make PS with 24 Volts regulated 50Watts for my PLC's. Please
help me, how to cretae it, i beg you all to give me some information
about that circuit, schematic, components list completely. Buying PS

I'm doing my project. here i hav 2 options. either to use the laser o
the active infrared as my motion sensor. well i'm quite in DILEMMA t
choose it. i'm considering the coat to construct the circuit and it
path range in sensing the motion.  any expert in motion sensor

I want to build (a pair of) H-bridges to drive my motors, described
thusly (from Tamiya kit # 70097 - two FA-130 motors):
    * RPM: 6990-9100 (6990 Max. Efficiency)
    * Voltage: 1.5-3V (1.5V Recommended)

I've previously ask this question however i did not get a reply.
I have a module that interfaces using;
1) MII PHY
2) GPSI PHY

Guys, i'm currently working on National Semiconductor's DP83847
Ethernet Transceiver.
In their reference designs, there's this 0.0 ohm resister at the output
pin of the 25Mhz oscillator

So I've designed a translater using basic 74 series ttl gates.  I've
designed both a half and full step translater. I finished soldering
together the parts and i tested out the four outputs and the full step
sequence was correct.  However I hooked up the outputs to a ul2003

Does anyone happen to have information as to how thermal print heads
work?  Any help is much appreciated.  Thanks!