Electronics Forum / Electrical Engineering / June 2003

I've been searching high and low for a reliable solution for marking
transmission lines at night. I've seen a few of the lighted orange
balls around but can't find a source on the internet. One of the other
engineers in our group spec'd in some neon light tubes for one of our

A friend wants to install a 24000 BTU air conditioner in a VW repair shop
with around 1920's wiring. He doesn't want to tamper with the old service
panel.( I don't know what the service drop current rating is ). There are no
240 volt outlets in the shop. He wants to provide 240 volt ...

I need 9+ KV for a project I am doing.  However, I only have 6KV
transformers, tops.  Is there anyway I can connect more than one 6KV
transformer to get the needed voltage (perhaps in series?)
Cheers,

I could use some help determining the name and nature of the op-amp
schematic symbol with a single line in and single line out and this
marking (crudely represented):
_

I don't know if this is the appropriate newsgroup to ask this, I would
appreciate if you could tell me if there is a better newsgroup to discuss
this issue. I also posted the same on alt.electronics, but I don't know if
I'll

Does anybody know what are the drawbacks of using a paper phenolic
based pcb on a simple circuit design?

Can some one give me an idea as to why a 4 to 20 milliamp signal from the
controlling computer will not control a variable speed drive, but if a 4 to
20 milliamp isolator is installed,  it works and controlls.  There doesn't
seem to be difference between the two signals that can be ...