Search found 2157 matches

by jwax
Sun Jun 27, 2004 8:47 am
Forum: General Discussion
Topic: What does this mean?
Replies: 19
Views: 7190

Re: What does this mean?

RonH- You are correct, that is what Dean meant for the glass plate- it is not a resonator by any means.
Maybe on another planet......
John
by jwax
Mon Jun 21, 2004 6:31 pm
Forum: General Discussion
Topic: Need help creating cellphone mute
Replies: 14
Views: 6903

Re: Need help creating cellphone mute

I say buy it, Eq! Hey! "HOL-FLAUNIRegular price: US$43.99Sale price: US$7.90", you not only get the device you need, you get to tell us how it works! It may just have a microphone/amp/rectifier driving the lamp, with power borrowed from the cradled phone.
We'd like to know! :D
by jwax
Sun Jun 20, 2004 2:38 pm
Forum: General Discussion
Topic: Wanted: Electronics/Laser Tech in LA Area
Replies: 2
Views: 1541

Re: Wanted: Electronics/Laser Tech in LA Area

I hear $70K/yr allows a family of one to survive there. Wonder what this job pays.
by jwax
Sat Jun 19, 2004 6:17 am
Forum: General Discussion
Topic: odd ball parts....
Replies: 17
Views: 6430

Re: odd ball parts....

Right, Dean! The pencil lead mass-loaded the crystal, dropped it's natural resonance, and broadening its Q. Grinding down was preferred!
Again, a little too much force while grinding, and....snap! Two crystals that won't oscillate!
:( I'm (was) WA2RBA. Maybe we chatted before! :D
John
by jwax
Fri Jun 18, 2004 10:26 am
Forum: General Discussion
Topic: adding driving lights to motorcycle...
Replies: 6
Views: 2668

Re: adding driving lights to motorcycle...

Don't know about the Tennesee DMV, but you'd be stopped by a lawman in New York state for badly aligned lights. We have state-approved inspection stations, and they check headlight alignment! Check with a local bike shop.
by jwax
Thu Jun 17, 2004 6:04 pm
Forum: General Discussion
Topic: Circuit board etching
Replies: 4
Views: 2114

Re: Circuit board etching

Stay safe with ferric chloride- off the shelf at Radio Shack. Use aluminum foil on a table, then etch in a shallow pan that's inside an empty old pan, or cookie sheet to catch any splashes. Glass or plastic containers will work, and use plastic tongs for handling the board. Use gloves and eye protec...
by jwax
Thu Jun 17, 2004 3:10 pm
Forum: General Discussion
Topic: Mixing motor types.
Replies: 7
Views: 2807

Re: Mixing motor types.

Train a laser pointer at her camera!
by jwax
Thu Jun 17, 2004 4:49 am
Forum: General Discussion
Topic: Making a coin light up
Replies: 5
Views: 2968

Re: Making a coin light up

A good hobby store carries acrylic casting materials for casting your own clear "coin" if that's what you're after. Make one, or one hundred at a time with an inexpensive mold.<p>John
by jwax
Wed Jun 16, 2004 5:34 pm
Forum: General Discussion
Topic: Making a coin light up
Replies: 5
Views: 2968

Re: Making a coin light up

"Getting a patent" and "not a lot of money" don't go in the same sentence. Your best bet is to first consult a patent lawyer and get an idea of the leaguethey play in. Next, bear in mind that having a patent (in 2-4 years) protects you only if you can again pay a lawyer to defend...
by jwax
Tue Jun 15, 2004 5:02 pm
Forum: General Discussion
Topic: odd ball parts....
Replies: 17
Views: 6430

Re: odd ball parts....

Waaay too many, Dean! Same with the "torch-shift" method of changing values! That one "stinks" too! :) Lots of "Unodes" as you call them. Those, we'd sell to the freshmen saying they'd be ahead of the class if they brought theirs in instead of having to make them! "...
by jwax
Mon Jun 14, 2004 5:44 pm
Forum: General Discussion
Topic: odd ball parts....
Replies: 17
Views: 6430

Re: odd ball parts....

Alright Dean, you've dated me! (as in carbon!) :)
Filing up carbon comp resistors goes back to the early days, and yes, it does have its pitfalls, drift and temperature instability to name two!
But, in a pinch.......
"Ol' John"
by jwax
Sun Jun 13, 2004 2:16 pm
Forum: General Discussion
Topic: odd ball parts....
Replies: 17
Views: 6430

Re: odd ball parts....

If the circuit truly requires 402 ohms, you select a 390 (standard value) carbon, break out your trusty small file, and start swipeing away! You'll first carve out the body, then when you start cutting into the resistor element, monitor the resistance until you hit 402 ohms. Cover the wound with glu...
by jwax
Fri Jun 11, 2004 3:51 pm
Forum: General Discussion
Topic: solar cell reverse current
Replies: 5
Views: 2547

Re: solar cell reverse current

Well, it proves what I believed all along, solar cells are AC generators! Just a rather low frequency is all! :D
by jwax
Fri Jun 11, 2004 3:28 am
Forum: General Discussion
Topic: Wireless communication underwater
Replies: 4
Views: 2584

Re: Wireless communication underwater

Your 10 mw, 433 MHz system is pretty much useless in water. Research ultrasound, or better yet, very low frequency communication.
What is it you're trying to do?
John
by jwax
Thu Jun 10, 2004 4:15 am
Forum: General Discussion
Topic: solar cell reverse current
Replies: 5
Views: 2547

Re: solar cell reverse current

How are you measuring this "dark current", and what kind of solar cell is it?
John