Electronics Forum / Basics / May 2005

Dear all experts,
1) If i were to connect a simple circuit to determine the effects of
capacitance in Maxim Power Transfer, how will the capacitance values
affect the Maximum Power? What's the best capacitance to be used?

What happens to the output voltage when the 555 timer supplies higher
current?   how good is the program multisim? Would it be worth the
investment?

Hi - I thing the single thing that causes me the most problems with
electronic devices is polarities. Right now the thing that is really
bothering me is the difference between an anode and a cathode. According to
dictionary.com, an anode is:

Greeting all, I would like to know if anyone has any info on a video
distribution amplifier, such as the PCB layout or overlay? I have one
from Elektor, but am looking for another.
This is to assist me in the understanding and drawing the things in

    --I'm trying to find a source for a few surplus analog joysticks,
but not the gaming variety. I'm looking for the ones that are generally
found in R/C transmitters. Any pointers appreciated!

wouls a sinusoidal input to a comparator produce the same transfer
curve as a triangle waveform

I would like to program the 27c256 chip  (29c256 would actually be
preferred).
1. Are there good, low cost devices to program this chip?
2. Also, are there any good, low cost chip emulators for this 28-pin DIP?

I'm looking for a way to measure a small change in resistance (not
necessarily a small resistance, just a small change).  Is there a
common configuration of a wheatstone bridge or some other circuit that
I should consider for this?  It is not a problem if the measurement

Just a very basic question:
Can anyone share with me what's the benefit of using transistor as an
electrical relay compared to mechanical relay when the incoming signal
is from a computer?

I just purchased a printer/copier/fax combination device.  I successfully
installed it, and its software on my PC.  Going through the test procedures
I was told my fax line has a weak signal.  Are there any hints, tricks, or
modifications I can do, before I have to call the ...

I'm working on a battery charger for a Palm Pilot.  This fits inside the
modem docking case, where space is limited.  It basically takes 12v,
regulates it down to 4.1v with a LM317L, and feeds it to the docked palm
pda.

Hi - this is a follow-up to this thread:
http://groups-
beta.google.com/group/sci.electronics.basics/browse_frm/thread/679679383
cd7eab0/cb7e229d9bca99d5

I have a Conext (by APC) model CNB-325 battery backup power supply (not
a real UPS) that shows funny voltages when the power cord is
disconnected.
Backup supply plugged into AC outlet;

I had thought lead-free solder was considered safe.
I was prepared to let a 12 year old begin soldering (under supervision)
until I saw a warning on the back of the package stating that 'this
product contains a known carinogen to the state of Calif' (not exact

how does the treshold voltage change the transfer curve of a comparator?