Search found 18 matches

by Mr. K
Fri Sep 03, 2004 1:33 pm
Forum: General Discussion
Topic: Repairing laptop computer power supplies
Replies: 6
Views: 1573

Re: Repairing laptop computer power supplies

Thanks for the suggestions.<p>This link goes to a site that has units which appear physically similar to mine: http://www.toshibaacadapter.com. Choose a unit, select "More Details", then enlarge the picture to see the assembly more clearly. There is a detachable 6 foot line cord which supplies the u...
by Mr. K
Fri Sep 03, 2004 5:09 am
Forum: General Discussion
Topic: Repairing laptop computer power supplies
Replies: 6
Views: 1573

Repairing laptop computer power supplies

Our school has a number of power supplies for laptop computers that are out of service because the DC output wire has frayed or broken at the end of the strain relief at the power pack. Electrically, they're still good. The power packs are sealed plastic units (perhaps 4" x 2" x 1 1/2") with a visib...
by Mr. K
Fri May 14, 2004 3:23 pm
Forum: General Discussion
Topic: Outdoor compact flourescents
Replies: 5
Views: 1407

Re: Outdoor compact flourescents

Dacflyer-<p>Glad you got good results from LOA.<p>My experience differs.
by Mr. K
Fri Apr 09, 2004 11:53 am
Forum: Robotics
Topic: Belt vs. chain drives
Replies: 8
Views: 3931

Re: Belt vs. chain drives

One final observation....<p>When things go south (as they inevitably will): V-belts slip, chains break stuff. How's your budget?<p>PS: I love the Fenners on my table saw!!
by Mr. K
Fri Apr 09, 2004 10:09 am
Forum: General Discussion
Topic: How to test for hot (positive) wire?
Replies: 7
Views: 1943

Re: How to test for hot (positive) wire?

Don't mean to beat up this topic, but....<p>Many respondents have told you true stuff, and Dean gave you lots of really practical advice. But I sense that your question may be a bit more fundamental. Please forgive me if I go back too far.<p>In household AC service, we talk about a "hot" wire. This ...
by Mr. K
Fri Apr 09, 2004 9:48 am
Forum: General Discussion
Topic: Web Site Building
Replies: 6
Views: 1541

Re: Web Site Building

Oh, and I forgot.... If you really care about your reader, please go to Vincent Flanders' page www.websitesthatsuck.com . He's pretty plain about what people love and what egotistic web windbags inflict on their populace.
by Mr. K
Fri Apr 09, 2004 9:43 am
Forum: General Discussion
Topic: Web Site Building
Replies: 6
Views: 1541

Re: Web Site Building

I agree that Dreamweaver is better than FrontPage, but you can still do a lot of fine work with FP. In fact, you can do a lot of fine work with Notepad if you are suitably motivated. A couple of reference sites that I like include htmldog.com and webmonkey.com. Webmonkey is about to take the big rid...
by Mr. K
Tue Jan 27, 2004 6:40 pm
Forum: Robotics
Topic: Out = Out + In
Replies: 5
Views: 2594

Re: Out = Out + In

The program code looks like it will do what you say you want.<p>Two questions/observations:<p>1.) Is there a way you can "prove" the speed of the code and make sure that the code will execute sufficiently fast to handle the data rate? You said nothing about the capability of your platform.<p>2.) Dep...
by Mr. K
Tue Jan 27, 2004 6:12 pm
Forum: General Discussion
Topic: 110 v a.c. annunciator
Replies: 2
Views: 941

Re: 110 v a.c. annunciator

Except for the "pleasant sounding" part, I've been doing that for years with some X-10 based toys. A motion sensor flood light by the garage sends an X-10 signal to a receiver in the house whenever it turns on. Receivers are available with screw terminals that can be used to trigger an external devi...
by Mr. K
Tue Jan 27, 2004 10:30 am
Forum: General Discussion
Topic: audio questions
Replies: 10
Views: 2010

Re: audio questions

Thanks for the link, Ron! More to it than I realized.
by Mr. K
Mon Oct 27, 2003 3:48 pm
Forum: General Discussion
Topic: telephone interface
Replies: 6
Views: 1762

Re: telephone interface

Not sure why you experienced that problem. Maybe someone with more circuit or telephone know-how can help more. Here, in imprecise terms, is what should be going on.<p>The Telco supplies a DC voltage (they call it "battery") of around -48V to your telset. The two lines have a capacitor in series wit...
by Mr. K
Mon Oct 27, 2003 3:17 pm
Forum: General Discussion
Topic: Need ideas for variable sampling rates.
Replies: 8
Views: 2041

Re: Need ideas for variable sampling rates.

Cool. Thanks! I can think of a number of ways to employ that approach to defuse the math/graphing phobias that some of these kids have.
by Mr. K
Sun Oct 26, 2003 12:06 pm
Forum: General Discussion
Topic: Need ideas for variable sampling rates.
Replies: 8
Views: 2041

Re: Need ideas for variable sampling rates.

Thanks for the tips on the 4-trace plugins. I'll add those to my "wish list".<p>I appreciate the further discussion on signal sampling and understand the points. What I'm wondering now is how much I need to worry about pre-filtering higher freqs and post-filtering for ripple. I'm dealing with high s...
by Mr. K
Sat Oct 25, 2003 5:45 am
Forum: General Discussion
Topic: Need ideas for variable sampling rates.
Replies: 8
Views: 2041

Re: Need ideas for variable sampling rates.

Thanks for the thoughts! I've done the connect-the-dots thing. Some kids get it, some don't. Maybe I need to rethink my presentation.<p> Re 3 traces: I've got an old Tek 549, so there's two traces. Maybe I'll have to get out to the flea markets for that freq counter.<p> Thanks also for "Nyquist". I'...
by Mr. K
Fri Oct 24, 2003 8:51 pm
Forum: General Discussion
Topic: Need ideas for variable sampling rates.
Replies: 8
Views: 2041

Re: Need ideas for variable sampling rates.

Thanks for the reply and the diagram. If I understand correctly, this would be a "real time" demo. Twist R2 and the sound goes from ugly to pretty. Right? The only "unknown" would be the actual sampling rate, but I could stick a 'scope on lead 3 of the 555 so they could see the rate pick up or drop ...