Search found 2118 matches

by jwax
Sat Feb 28, 2004 6:07 am
Forum: General Discussion
Topic: Wireless Remote Control troubleshooting question
Replies: 15
Views: 2986

Re: Wireless Remote Control troubleshooting question

Am I missing something? Both TX and RX are rated for 5 vdc supply maximum!
Using 6 lithiums in series may have cooked them both.
by jwax
Thu Feb 26, 2004 4:44 pm
Forum: General Discussion
Topic: Wireless driveway alarm
Replies: 14
Views: 2412

Re: Wireless driveway alarm

$349 Canadian for the 1000 ft unit?
I'll build and sell you the same thing for half of that! How many do you want to order? :D
by jwax
Thu Feb 26, 2004 4:27 pm
Forum: General Discussion
Topic: WARNING LIGHT CIRCUIT
Replies: 5
Views: 1185

Re: WARNING LIGHT CIRCUIT

Apply the incoming 24 volt pulse to a relay. Wire the contacts of the relay to connect the 24 volts to its coil, keeping it "latched" on, while another set of contacts is keeping your other lamp on. Then pushing a "normally closed" switch in the coil circuit will interupt the relay, causing it to dr...
by jwax
Wed Feb 25, 2004 3:56 am
Forum: General Discussion
Topic: Automotive dual battery question
Replies: 29
Views: 5052

Re: Automotive dual battery question

My, my! Let's expand on the proportions. Say the passenger side battery is 2 feet away from the starter with 2/0 cable. The drivers side battery is connected by 4 ga, in say, the next county. Same current from each battery? I don't think so. Most of the current from the drivers side is lost as IR dr...
by jwax
Tue Feb 24, 2004 3:25 pm
Forum: General Discussion
Topic: Automotive dual battery question
Replies: 29
Views: 5052

Re: Automotive dual battery question

Where's that guy with the strap-on ammeter?
The large, close cable (passenger side) will carry most of the current.
by jwax
Sun Feb 22, 2004 7:10 pm
Forum: General Discussion
Topic: UHF TV antennas
Replies: 12
Views: 2091

Re: UHF TV antennas

Thanks, all! Looks like I have a Yagi to build!
I appreciate the info, and love a challenging project! ;)
by jwax
Sun Feb 22, 2004 3:09 pm
Forum: General Discussion
Topic: searching for 1.5 volt led low ma for battery charge ind
Replies: 11
Views: 2346

Re: searching for 1.5 volt led low ma for battery charge ind

http://www.marktechopto.com/index.cfm?a=138
That's the link to the voltage/current plot I tried to picture. Sorry.
by jwax
Sun Feb 22, 2004 3:04 pm
Forum: General Discussion
Topic: searching for 1.5 volt led low ma for battery charge ind
Replies: 11
Views: 2346

Re: searching for 1.5 volt led low ma for battery charge ind

Image
Here's a typical LED voltage/current plot.
Note it doesn't draw any current until the applied voltage reaches 1.8 volts.
www.solarworld.com has a great collection of solar cells.
by jwax
Sat Feb 21, 2004 5:11 pm
Forum: General Discussion
Topic: UHF TV antennas
Replies: 12
Views: 2091

Re: UHF TV antennas

Thanks Al, but "buying cable" is what I'm avoiding. $40/mo for dozens of channels that I wouldn't watch. My local (50 miles) UHF staions are free for the grabbing off the air! Did you know that when David Sarnoff (RCA)swindled Philo out of his television patents, the media giant didn't even want to ...
by jwax
Sat Feb 21, 2004 6:45 am
Forum: General Discussion
Topic: UHF TV antennas
Replies: 12
Views: 2091

UHF TV antennas

Anybody have good success with an amplified UHF TV antenna? Lots of brands to choose, but which is a good one?
John
by jwax
Sat Feb 21, 2004 6:17 am
Forum: General Discussion
Topic: searching for 1.5 volt led low ma for battery charge ind
Replies: 11
Views: 2346

Re: searching for 1.5 volt led low ma for battery charge ind

In general, Edwardo-no.
Typical led's require 2 volts, and more than 5 ma. to light.
You'll need a bigger solar cell.
by jwax
Wed Feb 18, 2004 4:24 pm
Forum: General Discussion
Topic: Regulated 7VDC 2Amp power supply suggestions?
Replies: 15
Views: 3103

Re: Regulated 7VDC 2Amp power supply suggestions?

Hook up your 12v and 5v so they fight it out!
12-5=7!<p>Sorry. Couldn't resist!
by jwax
Tue Feb 17, 2004 5:44 pm
Forum: General Discussion
Topic: LCD pannel retrofit to TV or monitor
Replies: 6
Views: 1428

Re: LCD pannel retrofit to TV or monitor

Kindly dispose of properly! Better yet, donate it to a school. Maybe some young budding technician will discover a way to make it live again!
by jwax
Fri Feb 13, 2004 3:24 pm
Forum: General Discussion
Topic: lightning strike
Replies: 13
Views: 2297

Re: lightning strike

Metal roof, metal chimney? Sounds like a lightning magnet to me! So, add a lightning rod, and copper cable as directly down to earth as possible. Concrete is a poor conductor! Do not rely on it for a "suitable ground"!
John
by jwax
Tue Feb 10, 2004 4:37 am
Forum: General Discussion
Topic: Wireless trigger
Replies: 14
Views: 2928

Re: Wireless trigger

I see your point Mike!
Try a look in the American Radio Relay League (ARRL) Handbook for loads of info on transmitters and receivers.