Search found 82 matches

by jimmy101
Wed Aug 05, 2009 10:11 am
Forum: General Discussion
Topic: Throatenna
Replies: 11
Views: 2570

Re: Throatenna

This is similar to how one would hold an antenna in a strange pose to improve an analog TV reception with rabbit ears back in the days of mechanical tuners without PLL. Yep. And the signal strength would then change when you walked away from the antenna. You don't need to be touching the antenna to...
by jimmy101
Tue Jul 14, 2009 4:55 pm
Forum: General Discussion
Topic: How to build a wireless security system i.e. parts
Replies: 17
Views: 4706

Re: How to build a wireless security system i.e. p

If someone is worried about the voltage drop on a 1000 foot Romex line at 120v, why suggest a low voltage phone line? It'll be far, far worse! Because phone cable is dirt cheap and if it is a low amp and low voltage circuit than it can be the generic phone cable gauge (24G?). Really don't care abou...
by jimmy101
Tue Jul 14, 2009 9:53 am
Forum: General Discussion
Topic: How to build a wireless security system i.e. parts
Replies: 17
Views: 4706

Re: How to build a wireless security system i.e. p

You might consider burying 6 conductor phone line instead of a 120VAC cable. A 1000 foot run for 120VAC, even for circuit of only a couple amps, is going to take a fairly hefty cable rated for burial. Big cost to bury to 2.5', and if it ever gets ripped up, big cost to repair. Phone cable can be run...
by jimmy101
Wed Jul 08, 2009 11:45 am
Forum: General Discussion
Topic: Wide angle web cam or lens
Replies: 8
Views: 1605

Re: Wide angle web cam or lens

Another possiblitiy is to just hack a "fish-eye" lens from a door peep hole on to your camera. They are very wide angle and you can probably pick one up at the local hardwares store for a couple bucks. http://www.flickr.com/photos/artemisthephoenix/1932526223/ has an example, though not a lot of det...
by jimmy101
Thu Jun 25, 2009 7:16 am
Forum: General Discussion
Topic: Portable television...
Replies: 17
Views: 2349

Re: Portable television...

Many digital TVs (and most of the digital converters for use with analog TVs) have a "signal strength" indicator. Usually it is both a bar graph on the screen and an audible tone. The tone lets you monitor the signal strength as you tweak the antenna position, even if you can't see the TVs screen. (...
by jimmy101
Sat Jun 06, 2009 10:48 pm
Forum: General Discussion
Topic: HHO generator project
Replies: 8
Views: 1631

Re: HHO generator project

Why do you want to use 60V? You said eleven plates so I assume your are running ten cells in series. The original 12V battery was putting in 1.2 volt per cell. Same setup with a 60V source and you are putting 6V in per cell. Really no need to do that. You only need 1 to 2V per cell to get the electr...
by jimmy101
Thu Jun 04, 2009 9:15 am
Forum: General Discussion
Topic: $50 Oscilloscope worth the money for a hobbyist?
Replies: 13
Views: 2478

Re: $50 Oscilloscope worth the money for a hobbyis

Heck, you've already got a "$50" Oscope. Just use the sound card on your PC or laptop: 48KHz, 16-bit, dual channel recording Oscope. There are a couple freeware apps available for using the soundcard as an Oscope. You usually can't do DC measurements but anything in the audio range is a piece of cak...