Search found 2123 matches

by jwax
Tue Apr 27, 2004 10:38 am
Forum: General Discussion
Topic: Speaker Wire Elevators
Replies: 43
Views: 10828

Re: Speaker Wire Elevators

I can't believe the stupidest piece of junk gadget topic is up to 3 pages! Who keeps writing in?
by jwax
Tue Apr 27, 2004 10:33 am
Forum: General Discussion
Topic: Ultrasonic Cleaner Schematic
Replies: 3
Views: 2275

Re: Ultrasonic Cleaner Schematic

Tried that myself for cleaning gun parts. I found the DIY approach too expensive because the transducers in small quantity are spendy! $60+. Then you have the joy of matching inductors to the likes of Branson, or Crest units. To repair a 1 gallon unit with blown transducers, would have cost $160, a ...
by jwax
Tue Apr 27, 2004 10:25 am
Forum: General Discussion
Topic: getting rid of noise on car radio
Replies: 9
Views: 2228

Re: getting rid of noise on car radio

Contact the radio manufacturer and let them know about the faulty installation. Try a competitive installer for their opinion.
Then there's always grounded aluminum foil!
Good luck! I prefer the older radios over the fancy-dancy new crap anyway!
by jwax
Mon Apr 26, 2004 9:48 am
Forum: General Discussion
Topic: recovery of gold from electronics
Replies: 5
Views: 2505

Re: recovery of gold from electronics

Your biggest problem is how to get to the gold-if it's molded in plastic it's not available for any of your etchants. Exposed gold on connectors, pcb's, etc can be safely etched (disolved into, then reclaimed) by what is called "KI&I". It is a mixture of Potassium Iodide and Iodine. Reasonable safe,...
by jwax
Sun Apr 25, 2004 6:00 pm
Forum: General Discussion
Topic: H bridge mosfet choice?
Replies: 7
Views: 1872

Re: H bridge mosfet choice?

I used a Curtis Instruments MOSFET controller for a 48V, 175A electric go-kart.
http://www.curtisinst.com/
There's many concerns about throttling 5-10 kilowatts that the amateur might do well to leave to a pro! (Heat, emergency shut-down, runaway, acceleration limiting, to name a few) Just my 2c.
by jwax
Thu Apr 22, 2004 5:04 am
Forum: General Discussion
Topic: 100w bulb in 40w max desk lamp
Replies: 13
Views: 3566

Re: 100w bulb in 40w max desk lamp

Keep in mind that bulbs that seem to burn out early, or troublesome lamps, can be a fire hazard.
An electrician would know.
At least keep good batteries in your smoke detectors!
by jwax
Wed Apr 21, 2004 5:00 am
Forum: General Discussion
Topic: Led Constant Current driver help
Replies: 8
Views: 1889

Re: Led Constant Current driver help

Don't forget the capacitor shown in Fig. 17, too!
by jwax
Wed Apr 21, 2004 4:50 am
Forum: General Discussion
Topic: 350T Power pulse generator. Rate or amplitude?
Replies: 8
Views: 1677

Re: 350T Power pulse generator. Rate or amplitude?

"We're not here to discuss your jewelry, Clotheyes, where's "YELLOWBEARD?" My favorite movie, Perfectbite!
by jwax
Mon Apr 19, 2004 5:04 pm
Forum: General Discussion
Topic: Ways to do things
Replies: 5
Views: 1125

Re: Ways to do things

I agree Perfectbite (retired dentist?)! For common tasks, there's many solutions, but as correct solutions become less and less, the complexity grows rapidly! Then comes the complication of picking the "best" solution. Is best cheapest? Or quickest? Or coolest? When I'm miffed for a solution, I alwa...
by jwax
Mon Apr 12, 2004 5:02 pm
Forum: General Discussion
Topic: Ramsey Kits
Replies: 4
Views: 1159

Re: Ramsey Kits

You'll get some ideas (or copy theirs) on SCA detectors from: http://www.fineware-swl.com/sca.html
Built one years ago for 67 KHz.
Good luck, Mike!
by jwax
Mon Apr 12, 2004 4:41 pm
Forum: General Discussion
Topic: 1 Bit ALU
Replies: 3
Views: 1028

Re: 1 Bit ALU

Curious Turbo, what is a 1 bit ALU at the uni? :confused:
by jwax
Mon Apr 12, 2004 5:02 am
Forum: General Discussion
Topic: Continuous light dimmer sweep ?????
Replies: 22
Views: 4629

Re: Continuous light dimmer sweep ?????

A simple 555 timer could supply the sawtooth ramp voltage to a MOSFET.
by jwax
Mon Apr 12, 2004 4:44 am
Forum: General Discussion
Topic: 'gold' color /silver color on transistor EBC legs?
Replies: 9
Views: 1687

Re: 'gold' color /silver color on transistor EBC legs?

Keep in mind that a nickel plated copper lead will also be attracted by a magnet.
What's a TO-5 package?
by jwax
Sun Apr 11, 2004 7:14 pm
Forum: General Discussion
Topic: 'gold' color /silver color on transistor EBC legs?
Replies: 9
Views: 1687

Re: 'gold' color /silver color on transistor EBC legs?

Most are copper with a nickel/gold plating to inhibit corrosion. Silver color is usually solder-tinned copper.