Search found 218 matches

by k7elp60
Sat Nov 21, 2009 12:17 pm
Forum: General Discussion
Topic: Cellular (800Mhz) antennas/boosters?
Replies: 22
Views: 7761

Re: Cellular (800Mhz) antennas/boosters?

Here is a website of a company that manufacturers cell phone range extenders. I read that their equipment can extend the range to about 50 miles from a cell tower. http://www.wilsonelectronics.com/////////// This is a link that tells some more. http://www.wilsonelectronics.com////////////Files/Compe...
by k7elp60
Tue Sep 08, 2009 1:07 pm
Forum: General Discussion
Topic: flashing LED's
Replies: 12
Views: 2959

Re: flashing LED's

The cars I will be using with the flashing led's will not be on the track or be powered by the track. They will be part of a static display along side of the track. Went to Radio Shack all they have in flashing led's are red, but they have all the other colors I need that do not flash,so what I rea...
by k7elp60
Mon Sep 07, 2009 4:45 pm
Forum: General Discussion
Topic: flashing LED's
Replies: 12
Views: 2959

Re: flashing LED's

It has been my experience that if you connect regular LED's in series with flashing LED's all the LED's in that string flash at the same rate as the flashing LED. If you wanted too you could put two regular LED's in series with one of the flashing LED's and then a resistor connected to the 12V DC wa...
by k7elp60
Sun Sep 06, 2009 7:57 am
Forum: General Discussion
Topic: flashing LED's
Replies: 12
Views: 2959

Re: flashing LED's

The simple way would be to use a blinking LED. Radio Shack p/n 276-036 is a red one. As with all LED's you need a current limit resistor. Give is more info as to the Wall transformer you plan to use and how many LED's you want to use. With the LED mentioned a 6V DC wall transformer and a 150 ohm res...
by k7elp60
Mon Aug 10, 2009 12:52 pm
Forum: General Discussion
Topic: Stepper Motor Inductance
Replies: 2
Views: 897

Re: Stepper Motor Inductance

Bob,
You could measure the inductance in a round about way.
Create a constant current source and charge them up with the constant current source, while monitoring the voltage and the time, then do the calculation.
by k7elp60
Wed Jun 17, 2009 3:44 pm
Forum: General Discussion
Topic: an electronic device that would blast their music
Replies: 36
Views: 6091

Re: an electronic device that would blast their music

This company has some interesting devices that may be of help.
http://www.amazing1.com/ultra.htm
by k7elp60
Sun May 31, 2009 10:51 am
Forum: General Discussion
Topic: Car Antenna Impedance
Replies: 20
Views: 4706

Re: Car Antenna Impedance

I used to work for a electronic distributor, and before a lot of stuff was imported from China. We sold a lot of auto electronics. Most of the antennas had RG-62 coax from the antenna to the motorola male plug. The impedance of RG-62 is 93 ohms. Hello k7elp60, are those call letters? If so, what ki...
by k7elp60
Sun May 31, 2009 7:12 am
Forum: General Discussion
Topic: Car Antenna Impedance
Replies: 20
Views: 4706

Re: Car Antenna Impedance

I used to work for a electronic distributor, and before a lot of stuff was imported from China. We sold a lot of auto electronics. Most of the antennas had RG-62 coax from the antenna to the motorola male plug. The impedance of RG-62 is 93 ohms. The sensitivity of good guality AM/FM auto radios is r...
by k7elp60
Mon May 25, 2009 7:56 am
Forum: General Discussion
Topic: LED /Low-voltage lighting in new home?
Replies: 16
Views: 3599

Re: LED /Low-voltage lighting in new home?

I have been using some DC lighting in my home for about 10 years, and it has been powered mostly by batteries charged with solar panels. I have 3 ea 75 watt solar panels that charge 4ea 6V 225AH golf cart batteries connected in a parallel/series configuration. The primary purpose of the the system w...
by k7elp60
Mon Jan 05, 2009 7:47 am
Forum: General Discussion
Topic: Mail Notifier
Replies: 9
Views: 2114

As a word of caution. I was working on the same thing several years ago for my mother who had to walk about 100 feet to a mailbox on the street. If you are in the US you may want to check with the postmaster general as at that time anything attacted to the mail box had to have his approval. Also rec...
by k7elp60
Tue Dec 30, 2008 6:17 am
Forum: General Discussion
Topic: Thyratron
Replies: 21
Views: 4704

Thyratron, ah I remember them somewhat. A vacuum tube filled with gas that when triggered on a grid, current would flow from cathode to plate and they would glow. A couple of numbers might have been 4C35 and 2050. They were used like SCR's today.
by k7elp60
Mon Nov 17, 2008 6:10 pm
Forum: General Discussion
Topic: Impedance protected?
Replies: 8
Views: 2153

It is possible they fall into the catagory of class II transformers as described below: What is a Class II Transformer? A Class II transformer is used to supply Class II circuits. Class II transformers have a maximum VA (Volt-Ampere) rating of less than 100 and a maximum secondary output of 30 VAC. ...
by k7elp60
Sun Sep 14, 2008 7:12 am
Forum: General Discussion
Topic: Incandescent lamp longevity at half rated voltage
Replies: 18
Views: 4740

To add to what MrAl has said. Incandescent lamp life ratings should be taken with a grain of salt. Life ratings are based on shock-free, vibration-free, ripple free testing. Lamps are not turned on and off during life testing, so there is no thermal cycling. Increased life can be obtained by deratin...
by k7elp60
Sat Sep 13, 2008 7:25 am
Forum: General Discussion
Topic: My first electronics project
Replies: 18
Views: 4349

Hi Robert, Ohhhhh, so yourrrrr the one who invented the electric frying pan then, or was it the electric heater or toaster oven? <chuckle> On a similar note when I was a teenager I saw an article where one could cook hot dogs in about 5 seconds. The device had stiff copper wire about an inch long s...
by k7elp60
Thu Sep 11, 2008 1:51 pm
Forum: General Discussion
Topic: My first electronics project
Replies: 18
Views: 4349

Re: My first electronics project

Can't wait to hear from some of the old-timers such as myself. Dave I'm not sure what my very first project was but I recall one of my first ones. It was a two tube kit that was built breadboard style that used the 1.5V filament tubes. I got it working and then rebuilt it in a plastic cigar box tha...