Search found 2133 matches

by jwax
Mon Mar 29, 2004 4:47 am
Forum: General Discussion
Topic: ultrasonic motion detector
Replies: 5
Views: 1294

Re: ultrasonic motion detector

I'm all for ultrasonics applications, but if it's motion detection you want, infra-red detectors are cheap, directional, and available in all types of ranges.
by jwax
Fri Mar 26, 2004 3:30 pm
Forum: Computer Programming
Topic: ACAD to G&M Codes
Replies: 2
Views: 1983

Re: ACAD to G&M Codes

Thank you, Caesar! Appreciate your reply!
Found someone with MasterCAD knowledge!
Fascinating what 3D modeling can do!
John
by jwax
Thu Mar 25, 2004 4:07 pm
Forum: General Discussion
Topic: Air horn
Replies: 7
Views: 1753

Re: Air horn

by jwax
Wed Mar 24, 2004 4:05 pm
Forum: General Discussion
Topic: Varying AC frequency
Replies: 11
Views: 3265

Re: Varying AC frequency

Not to discourage Sunil, but that's 10 octaves of frequency range! AND at 50 amps! Hope you have deep pockets for this project.
Could we ask what it is for, in case theres an alternative possibility to achieve your goal?
by jwax
Mon Mar 22, 2004 10:36 am
Forum: General Discussion
Topic: Cleaning circuit boards
Replies: 11
Views: 2547

Re: Cleaning circuit boards

If you had access to an ultrasonic cleaner, submerge the board in isopropyl alcohol and shake away. Repeat with clean alcohol, dry.
by jwax
Thu Mar 18, 2004 3:38 pm
Forum: General Discussion
Topic: Resistive spark plugs...
Replies: 5
Views: 1382

Re: Resistive spark plugs...

My 2 cents- The ozone disassociates chlorine from the thermoset plastic distributor cap. It's a chloride dusting.
Anybody got a lab?
John
by jwax
Wed Mar 17, 2004 3:34 pm
Forum: General Discussion
Topic: Half wave rectified mains...
Replies: 6
Views: 1612

Re: Half wave rectified mains...

One question, Miguel- Why?
Is this a technical feat or a frugal one?
John
by jwax
Mon Mar 15, 2004 3:03 pm
Forum: Computer Programming
Topic: ACAD to G&M Codes
Replies: 2
Views: 1983

ACAD to G&M Codes

My CNC machine uses "G & M" Codes to direct its' cutting tool in x,y, and z axis. If I draw a figure in AutoCad, any ideas on how I can convert those files to tool path motions? The ACAD files have all the point-to-point xyz coordinates, but the CNC machine wants ASCII commands to tell it where to g...
by jwax
Thu Mar 11, 2004 5:28 pm
Forum: General Discussion
Topic: spark plug voltage
Replies: 5
Views: 1542

Re: spark plug voltage

Don't! Sure fire way to fry your multimeter! Without serious monitoring equipment, you won't measure anything significant. Remove the plug from the head, ground its' threads, and yank away. Bright blue spark at gap says all is well. Wanna get fancy? Build a spark gap- two nails pointed at each other...
by jwax
Wed Mar 10, 2004 3:47 pm
Forum: Computer Programming
Topic: data logger for a temperature sensor
Replies: 2
Views: 2028

Re: data logger for a temperature sensor

GW- Try:
http://www.omega.com/newsearchengine/es ... mit=Search<p>Omega has loads of temp sensors/loggers/accessories.
Have a blast!!
John
by jwax
Tue Mar 09, 2004 3:01 pm
Forum: General Discussion
Topic: Magnetrons
Replies: 5
Views: 1212

Re: Magnetrons

Those microwave power supplies make wonderful supplies for that Tesla Coil project your neighbors don't want you to build! :D
by jwax
Sat Mar 06, 2004 7:09 pm
Forum: General Discussion
Topic: Best FET to use?
Replies: 9
Views: 2070

Re: Best FET to use?

Big project, Bern! I bought a Curtis DC Controller for an electric go-kart I built. 48 volt @ 200 Amps, and that was for a 1 HP DC motor. It used 8 MOSFETS. You'll have thermal considerations, load-sharing, shut-down protection, to name a few. If you still pursue building your own, one source is Adv...
by jwax
Fri Mar 05, 2004 3:57 am
Forum: General Discussion
Topic: UHF TV antennas
Replies: 12
Views: 2660

Re: UHF TV antennas

Thanks Dean! I appreciate your insight!
John :D
by jwax
Mon Mar 01, 2004 3:19 pm
Forum: General Discussion
Topic: Connecting Portable CD player to car radio
Replies: 5
Views: 1385

Re: Connecting Portable CD player to car radio

Or for $20, the RS will sell you a "CD-to-Cassette" Adapter- cat. no. 12-1999.
(Assuming your car radio has cassette)
by jwax
Sat Feb 28, 2004 6:09 am
Forum: General Discussion
Topic: Wireless Remote Control troubleshooting question
Replies: 15
Views: 3707

Re: Wireless Remote Control troubleshooting question

Rather, using 12 vdc my have fried them.