Search found 13 matches

by kb9nvh
Mon Apr 12, 2004 10:16 am
Forum: General Discussion
Topic: Continuous light dimmer sweep ?????
Replies: 22
Views: 4629

Re: Continuous light dimmer sweep ?????

Thanks for your reply<p>Using a IGBT in the linear region I think there's a lot of heat to deal with. And this cant be use with a motor. If we were trying to switch the AC (like a light dimmer) then theirs the zero crossing to worry about. If we didnt' then we could get random brightness levels as w...
by kb9nvh
Sun Apr 11, 2004 1:17 pm
Forum: General Discussion
Topic: Continuous light dimmer sweep ?????
Replies: 22
Views: 4629

Re: Continuous light dimmer sweep ?????

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by k7elp60: Velleman makes a kit that will control the brightness of a lamp with a DC voltage of from 0-10 volts. The P/N is K8003. Jameco Electronics, WWW.Jameco.com has them in stock for about $22.0...
by kb9nvh
Sun Apr 11, 2004 6:18 am
Forum: General Discussion
Topic: Continuous light dimmer sweep ?????
Replies: 22
Views: 4629

Re: Continuous light dimmer sweep ?????

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by cato: The pot in a light dimmer just sets the voltage going to the gate of an SCR. When the voltage is changed so does the point in the AC wave form at which the SCR goes conductive and applies pow...
by kb9nvh
Sat Apr 03, 2004 8:45 pm
Forum: General Discussion
Topic: Continuous light dimmer sweep ?????
Replies: 22
Views: 4629

Re: Continuous light dimmer sweep ?????

I think a light house effect is more complicated than that....You have some low brightness as the ligth swings around just until it poits directly at you and then its brightness Peaks for an instant. I think you will have to experiment to get something that works effectively.<p>Probably have to use ...
by kb9nvh
Tue Mar 30, 2004 4:36 am
Forum: General Discussion
Topic: Continuous light dimmer sweep ?????
Replies: 22
Views: 4629

Re: Continuous light dimmer sweep ?????

Thanks, yes I had seen a hack for doing just that but couldn't remember what it was. At first I thought it was a hack on a normal dimmer but after puzzleing on it a while I remembered the hack was for a touch dimmer. The hack was to add a 47pf cap from the touch plate to ground. <p>Those touch dimme...
by kb9nvh
Mon Mar 29, 2004 4:21 pm
Forum: General Discussion
Topic: Continuous light dimmer sweep ?????
Replies: 22
Views: 4629

Re: Continuous light dimmer sweep ?????

Not a bad idea!! but you shouldn't have admitted that about your wife..LOL <p>Oh well, some of us are still good a mowing!! (as I sit here and look stupidly at my dimmer circuit)..<p>Thanks
by kb9nvh
Mon Mar 29, 2004 3:08 pm
Forum: General Discussion
Topic: Continuous light dimmer sweep ?????
Replies: 22
Views: 4629

Re: Continuous light dimmer sweep ?????

I guess I just need to do a little probing in there to see what voltages we're talking about.<p>Will this dimmer work in the neutral leg of the lamp so that I can use my O scope closer to ground levels...do you know?
by kb9nvh
Mon Mar 29, 2004 3:05 pm
Forum: General Discussion
Topic: Continuous light dimmer sweep ?????
Replies: 22
Views: 4629

Re: Continuous light dimmer sweep ?????

Thanks cato, So the voltage has to be AC that enters the diac? <p>How about my transistor idea? Is that workable.
by kb9nvh
Mon Mar 29, 2004 2:57 pm
Forum: General Discussion
Topic: Continuous light dimmer sweep ?????
Replies: 22
Views: 4629

Re: Continuous light dimmer sweep ?????

That would be some big bucks there wouldnt' it be? ....I would motorize some cheap dimmer switches I think before dedicating a variac for this purpose.<p>I just want some Ideas on how to implement this with a triac. I guess it must be pretty problematic as no one has any "electronic" ideas for this....
by kb9nvh
Mon Mar 29, 2004 10:07 am
Forum: General Discussion
Topic: Continuous light dimmer sweep ?????
Replies: 22
Views: 4629

Re: Continuous light dimmer sweep ?????

Thanks for your reply...funny but the "mechanical" solution you mention is the first one that seems to come to everyones mind (from another forum I've asked this question on as well). <p>I would really like to think of an electronic solution. <p>The way I see the problem is that we need to find a wa...
by kb9nvh
Mon Mar 29, 2004 7:20 am
Forum: General Discussion
Topic: Continuous light dimmer sweep ?????
Replies: 22
Views: 4629

Continuous light dimmer sweep ?????

How can I modify a AC light dimmer to do a continuous sweep between bright and dark. I want to be able to vary the speed and possibly have adjustable range limits for the bright peak and the dark minimum. <p>I'm at a loss as to how to do this so any advice is appreciated. Or even an example circuit....
by kb9nvh
Sat Jan 17, 2004 7:43 pm
Forum: General Discussion
Topic: Get cheap LEDs
Replies: 5
Views: 1093

Re: Get cheap LEDs

Thats where I got mine also....got 100 high output UV's and 100 high output Whites..<p>Great Deal!!! takes a while to get em from hong kong though..