Electronics Forum / Electronics / July 2006

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Hi all.  I am a part-time college student majoring in Electrical Engineering
Technology.  I have been trying to learn as much as I can on my own since I
was twelve; about ten years now.  The earliest material I found was in books
and experience in taking things apart.  I learned ...

I'm moving from solderless breadboard to a protoboard so I can obtain some
soldering experience.
I've never soldered TTL chips / sockets, so I wonding what size solder /
guage I will need?

I was wondering if anyone here might have some good ideas regarding
promotion of our web site.
The company was formed mainly from a technical base and one of the
weaknesses is learning how to let others know we are here.

I would be grateful for some advice on what is the most efficient way to
speed control an exhaust fan?
Not knowing much about motors, it is a 240 volt unit 0.45 amps.
JD

I need to make a short VGA extension cable for a PC, mainly due to the
custom case having a bar near where the video card plug is.
I found the pinout here http://www.bbdsoft.com/video.html
I take it I only need 8 cables to connect between the male and female ends

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I have an inverter that puts out a nice 120v square wave. The inverters that
put out a pure sine wave are expensive. Does anyone know where I can obtain
schematics to build a square to sine wave converter fo my inverter? Thanks
in advance.

The quandary
I'm rewinding an automobile style alternator rotor.  I want to use
some "Tefzel" insulated wire I have on hand, instead of magnet wire, I
have to special order.  I wound a test coil and it fits and looks like

Hi  I have a problem with my 32 inch telly. At first it wiould switch
on and then switch off immediately. Now it stays on for 20 minutes or
so and then switches off. I then have to turn it off by the switch so i
can use the remote to turn it back on. Does anyone have any ideas what

that the majority of mobile phones, mp3 players etc can't all use the same
charger that puts out 5v and uses the same plug as one of those small usb
connectors? This would have many advantages such as only needing one car
charger, being able to charge off a PC and reducing cables ...

I thought someone in this group may be able to help me. I have an automatic
sprinkler system with a 120 v transformer. It puts out 26.5 volts dc / 1500
milliamp. The sprinkler box is outdoors as intended. I have replaced the
transformer 3 times the manufacters original ...

I'm still working with an old RCA VTVM for voltage measurements of
high-voltage, high impedance sources. I need something at least in the
order of 5-10 Megohms/Volt.
The application is repairing and reconditioning Geiger Counters, where