Search found 87 matches

by Craig
Mon Apr 09, 2007 2:35 pm
Forum: General Discussion
Topic: ok, if this is not bogus..please explain..
Replies: 14
Views: 4085

anti gravity needs hi voltage and or magnetism I'm not saying this is real or not, but do we really know enough about anti-gravity to know what's needed to create such a thing? For some reason I always thought what was needed was some sort of shield to block the gravity that's there, not some syste...
by Craig
Wed Mar 28, 2007 6:04 am
Forum: General Discussion
Topic: This bulletin board change address or something?
Replies: 9
Views: 2272

I've had no problems. I've been using this address ever since I started coming here: http://www.servomagazine.com/forum/
by Craig
Tue Mar 27, 2007 5:08 am
Forum: General Discussion
Topic: need projector help
Replies: 16
Views: 4154

THe red blinking power light means that the lamp unit cover is open. If it blinks even though the lamp cover is securley closed, the manual says to contact yoru Sharp dealer, lol.
by Craig
Mon Mar 26, 2007 12:30 pm
Forum: General Discussion
Topic: Power Supply on March '07 N&V Issue
Replies: 8
Views: 2069

That's interesting. To make sure I have this straight, what you are describing is an IC that will take a single 5V source and split it into two "individual" sources that are isolated from each other?

Can you tell I'm a newbie? lol.
by Craig
Thu Mar 22, 2007 5:28 am
Forum: General Discussion
Topic: Talking car
Replies: 3
Views: 1122

Do you have an aftermarket radio in your car? If so, it may have a "cell phone" wire. This wire is designed to mute the radio when your (in-car) cell phone rings. You should be able to use that wire to mute the radio during an alert.

Will these alerts happen regardless if the car is turn on or off?
by Craig
Wed Mar 21, 2007 5:45 am
Forum: General Discussion
Topic: Power Supply on March '07 N&V Issue
Replies: 8
Views: 2069

Hi Robert, Thanks for your replies! I was a little confused about T1, I thought it was 44V split into two 22V lines to power each adjustable supply. I figured since the voltage is adjustable from 0-20 volts, that the transformer was putting out two 22V lines rather than two 44V lines. The reason I d...
by Craig
Mon Mar 19, 2007 11:57 am
Forum: General Discussion
Topic: This month's cover project
Replies: 10
Views: 2473

Or how about supply #1 powering the meters for supply #2, and supply #2 powering the meters for supply #1? Or how about having the 5V supply power the meters for both variable supplies?
by Craig
Mon Mar 19, 2007 10:09 am
Forum: Computer Programming
Topic: PICs - Difference between "Flash" and "Enhanc
Replies: 3
Views: 3480

PICs - Difference between "Flash" and "Enhanc

Hi, PIC has new chips that are replacing(?) the popular 16F876 and 16F877. These new parts are labeled 16F886 and 16F887. The new models seem to be superior in every way other than they use "Flash" program memory rather than "Enhanced Flash". What does the "Enhanced" flash feature that the regular f...
by Craig
Mon Mar 19, 2007 9:57 am
Forum: General Discussion
Topic: Power Supply on March '07 N&V Issue
Replies: 8
Views: 2069

Power Supply on March '07 N&V Issue

Since it seems a few of us are going to attempt to build this PSU, and a few of us have had issues sourcing parts, I think this would be a good place to combine our efforts. The first thing that I am trying to find is the appropriate transformer. T1 on the parts list is described as "120V Primary, d...
by Craig
Mon Mar 19, 2007 4:54 am
Forum: General Discussion
Topic: CD burner revisited
Replies: 12
Views: 4180

Check if there's a pin-hole in the front of the tray. If so, stick a paperclick in there to manually open the tray. From there, pull it open and see if that changes anytyhing. Try putting a CD in it then closing it to see if you can read it.
by Craig
Mon Mar 19, 2007 4:50 am
Forum: General Discussion
Topic: Difference between a Crystal, Oscillator, and Resonator
Replies: 6
Views: 2093

Ok, so a resonator/oscillator is a generic term for anything that resonates/oscillates, and a cyrstal is the small two-pin device that the oscillator/resonator uses to determine the frequency of the oscillation. Did I get that right? Also, in most of the N&V schematics for microcontrollers, they hav...
by Craig
Fri Mar 16, 2007 7:11 am
Forum: General Discussion
Topic: Question about resistor tolerances
Replies: 31
Views: 6550

I would like to see you test it with two batteries, like 9v cells to see if the noise goes away. I'll try that tonight and let you know what happens. I got the chips for free as samples from http://www.linear.com . When I ordered these samples they weren't offering the IC with the compensator and o...
by Craig
Fri Mar 16, 2007 6:45 am
Forum: General Discussion
Topic: Question about resistor tolerances
Replies: 31
Views: 6550

Robert: In your case, you will probably never see swings large enough to approach either rail(assuming input voltages do not exceed certain levels).There may be a problem here if your inputs have to handle large range of swing as the output may exceed the power supply rails. The max temperature rang...
by Craig
Fri Mar 16, 2007 6:33 am
Forum: General Discussion
Topic: Question about resistor tolerances
Replies: 31
Views: 6550

First, I want to say thanks! I was able to get it to work! I have a 13.8V Regulated DC power supply (left over from my R/C car racing days) which I built a 5V regulater for. So, I powered the LT1025 voltage cold junction compensator using that, and powered the Op-Amp using the 5 volt lead from an ol...
by Craig
Thu Mar 15, 2007 1:08 pm
Forum: General Discussion
Topic: Difference between a Crystal, Oscillator, and Resonator
Replies: 6
Views: 2093

Difference between a Crystal, Oscillator, and Resonator

Hi, What is the difference between a Crystal, Oscillator, and Resonator? My locla electronics store has all three, but very few with three prongs is shown in most articles in N&V. To add more confusion, sometimes the N&V articles use the terms interchangably, for example "It even has a built-in 4 MH...