Electronics Forum / Basics / August 2005

I want to operate 2 step motors together (the same steps) can i connect them
in prallel
to the same driver outputs?? (the driver can "give" the current to both
motors)

Hey all;
I just put 4 new tubes in my Carvin guitar amp and was wondering about
matching. The current through the cathode of the tubes is:
30mA

hi,everybody.
I have some questions about hight precesion constant current source.My
goal is 1uA whose error is blow 0.01%.
In my circuit I used a op-amp,p-mosfet and 5V voltage reference.

The Ethernet connectors have two metal pins which act as shield tabs
which need to be connected to local ground. Can anybody point out as to
how connecting the metal shield to local ground reduce interference.
Ethernet CAT5 connector uses differential transmit and recieve. So how

We have a photo-voltaic system with a battery bank configured to 24
Volts. There were sound reasons for going this way, but it has made
headaches because 24 V equipment is hard to find and expensive to buy.
My question is this; when we have a few cloudy days and I need to

I read a couple of postings wherein reference was made to magnets
demagnetizing though the type of magnet was not revealed.
What circumstance(s) is(are) involved?
Is this a failing common to an alloy or manufacturing process?

Three of my 60-80 Gig Maxtor hard drives failed. First it will not look
for datas. Later it will not format. Then finally it will click forever and
won't boot. All three have the same thing in common, there covers
were opened for a second in a clean, dust free room out of curiosity.

In response to my post about an anti-cogging core:
Jasen Betts wrote:

wrote:

my name is Jens and I am student of the Technical University Berlin. Through
my course of study in microelectronics VHDL design is becoming my favorite
hobby. My other interests are signal processing and compression in general.
Lately I purchased an FPGA Evalution board second-hand ...

If I have 2 12v motors, each 1 inch in diam, one with 3 poles, one with
5 (or 7) poles, which has more torque? more rpm? Whtas the rule of
thumb?

I have just set up my ERA-1SM amplifier, like it says to do here (P. 2) :
http://www.minicircuits.com/appnote/an60010.pdf
You can clearly see the output point.
My question involves my Oscope measurement technique.

I am looking for a stepper motor controller with parallel/serial port
interface. Anybody know where I can find these?
Thanks,
Puneet

 ... are in the process of being added to http://www.tinaja.com/glair01.asp

I have a question that is based on theory and is purely hypethetical.
I have an energized 12 vdc circuit that I am testing when I accidently
connect another 12 vdc source to the circuit so that voltages collide
in "head_on" fashion.

Any fundamental reasons why I can't use the guts of my
Tripplite 800 UPS with a larger external battery?
JazzMan