Search found 236 matches

by chessman
Wed Sep 24, 2003 12:58 pm
Forum: General Discussion
Topic: My Optrex LCD
Replies: 2
Views: 1098

My Optrex LCD

I have a large Optrex graphic LCD, model DMF-50840.<p>It doesn't have a controller.<p>I'm still a n00b when it comes to a lot of aspects of electronics, so I'm asking if someone can look over the data sheet and tell me if a SED1330-compatible controller could be made from a PIC? If it can be done, I...
by chessman
Tue Sep 23, 2003 4:14 pm
Forum: General Discussion
Topic: Old cell phone (S)
Replies: 5
Views: 1825

Re: Old cell phone (S)

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by geewiz: If you're concrned about the invasive technology being introduced into newer phones, keep the old one at hand and hope provider(s) will allow on their network.<p>"..invasive technology"? Yo...
by chessman
Tue Sep 23, 2003 3:54 pm
Forum: General Discussion
Topic: Makita drill
Replies: 6
Views: 1973

Re: Makita drill

With current draw, I think everyone's overlooking the point where current draw is the maximum on most cordless drills.<p>The brake. You take your finger off the trigger, the electronic brake engages, current is used to stop the motor.<p>Does your battery have a mAh rating stamped on it? If so, you c...
by chessman
Tue Sep 23, 2003 9:57 am
Forum: General Discussion
Topic: Need to reduce 4 volts to 3 volts
Replies: 9
Views: 2989

Re: Need to reduce 4 volts to 3 volts

Two AAs :D :p
by chessman
Fri Sep 05, 2003 12:30 pm
Forum: General Discussion
Topic: Using Graphics Card fan in project
Replies: 3
Views: 1755

Re: Using Graphics Card fan in project

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by dacflyer: white whire could also be a speed control for the fan..being controlled by the computer etc... <hr></blockquote><p>"A" for effort, but that's not how comp speed controls work for fans. Th...
by chessman
Fri Sep 05, 2003 12:28 pm
Forum: General Discussion
Topic: IR transmitter-detector
Replies: 11
Views: 3846

Re: IR transmitter-detector

What's wrong with going the simple route of a steady IR beam and a comparator on the other end to set a threshold of IR light? I know there could be problems with IR leakage, but I highly doubt it in this case.
by chessman
Fri Sep 05, 2003 12:23 pm
Forum: General Discussion
Topic: need help matching inputs to PA amp
Replies: 4
Views: 1526

Re: need help matching inputs to PA amp

To expand upon what Russ is saying, I'll add a couple things:<p>1) You may or may not have to match the input. If your amplifier has a 1/4" jack (looks like a headphone jack) for microphone input, you'll be fine. That's a "High-Z", or high impedence, input. If it has an XLR (three pins) jack, that's...
by chessman
Fri Sep 05, 2003 12:16 pm
Forum: General Discussion
Topic: A KiloWatt is a KiloWatt...
Replies: 11
Views: 3694

Re: A KiloWatt is a KiloWatt...

I disagree.<p>It seems logical that efficiency would come into play, just the same as it does in DC power supplies.
by chessman
Tue Aug 26, 2003 11:34 am
Forum: Computer Programming
Topic: Stamp vs PIC microcomputers
Replies: 16
Views: 10249

Re: Stamp vs PIC microcomputers

I started in PIC programming almost a year ago. It seems funky at first, especially if you've never written code in assembler before.<p>With the STAMP, there are commands that make up several lines of assembler. The stamp is much easier if you've used a program such as BASIC before.<p>In short, I've...
by chessman
Tue Aug 26, 2003 11:29 am
Forum: Robotics
Topic: Vision
Replies: 10
Views: 4141

Re: Vision

I'm not sure what devices you're using for vision Harold, but I have a little idea.<p>Take a laser diode (any wavelength) and put it through a diffraction grating. The pattern reflecting off objects would be something like:<p> x x x x x x x x x<p>A CCD camera would have a filter on it, the same wave...
by chessman
Tue Aug 26, 2003 11:22 am
Forum: General Discussion
Topic: Functional Generator Question
Replies: 9
Views: 5434

Re: Functional Generator Question

I agree the MAX038 is a little overkill for your application.<p>It's like using a shotgun to kill a snail
by chessman
Tue Aug 19, 2003 1:57 pm
Forum: General Discussion
Topic: WTB for friend: Cheap 12V 20A supply
Replies: 10
Views: 3551

Re: WTB for friend: Cheap 12V 20A supply

I've been banned from the net for a while. Sorry.<p>Wayne: yes, I received it. Thanks a bunch, works great! Sorry I wasn't able to let you know earlier :( <p> I was thinking about chaining two of my 10amp comp supplies together. Would I just be able to parallel the outputs? It doesn't seem like it w...
by chessman
Thu Jul 24, 2003 11:47 am
Forum: General Discussion
Topic: Need help with DC-DC conversion
Replies: 11
Views: 3052

Re: Need help with DC-DC conversion

Well I was figuring a 555 timer to generate the pulse signal, and then 2 MOSFETS in parallel (would this work????) to switch the 12VDC through the transformer...<p>I mean, I understand the whole concept of SMPS...but what worries me is the 350W capacity that I need to cover.
by chessman
Thu Jul 24, 2003 10:32 am
Forum: General Discussion
Topic: Need help with DC-DC conversion
Replies: 11
Views: 3052

Need help with DC-DC conversion

I need to convert 12VDC to +/-56VDC at 8A.<p>I can't afford an off-the-shelf product, but I have plenty of parts around, and I can buy small stuff like transformers.<p>thanks! :cool:
by chessman
Thu Jul 24, 2003 10:28 am
Forum: General Discussion
Topic: Small Jameco fall catalog
Replies: 9
Views: 2499

Re: Small Jameco fall catalog

I got the small catalog too. It was filled with hardly any parts, and a lot of "home electronics" stuff. I'm suprised that Jameco is expanding to that line of products.<p>I didn't think much of the small catalog though, because I have 10+ past catalogs that do just fine.