Search found 218 matches
- Sat Nov 21, 2009 12:17 pm
- Forum: General Discussion
- Topic: Cellular (800Mhz) antennas/boosters?
- Replies: 22
- Views: 12147
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...
- Tue Sep 08, 2009 1:07 pm
- Forum: General Discussion
- Topic: flashing LED's
- Replies: 12
- Views: 6167
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...
- Mon Sep 07, 2009 4:45 pm
- Forum: General Discussion
- Topic: flashing LED's
- Replies: 12
- Views: 6167
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...
- Sun Sep 06, 2009 7:57 am
- Forum: General Discussion
- Topic: flashing LED's
- Replies: 12
- Views: 6167
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...
- Mon Aug 10, 2009 12:52 pm
- Forum: General Discussion
- Topic: Stepper Motor Inductance
- Replies: 2
- Views: 1798
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.
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.
- Wed Jun 17, 2009 3:44 pm
- Forum: General Discussion
- Topic: an electronic device that would blast their music
- Replies: 36
- Views: 12299
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
http://www.amazing1.com/ultra.htm
- Sun May 31, 2009 10:51 am
- Forum: General Discussion
- Topic: Car Antenna Impedance
- Replies: 20
- Views: 8421
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...
- Sun May 31, 2009 7:12 am
- Forum: General Discussion
- Topic: Car Antenna Impedance
- Replies: 20
- Views: 8421
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...
- Mon May 25, 2009 7:56 am
- Forum: General Discussion
- Topic: LED /Low-voltage lighting in new home?
- Replies: 16
- Views: 7902
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...
- Mon Jan 05, 2009 7:47 am
- Forum: General Discussion
- Topic: Mail Notifier
- Replies: 9
- Views: 4154
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...
- Tue Dec 30, 2008 6:17 am
- Forum: General Discussion
- Topic: Thyratron
- Replies: 21
- Views: 10847
- Mon Nov 17, 2008 6:10 pm
- Forum: General Discussion
- Topic: Impedance protected?
- Replies: 8
- Views: 3769
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. ...
- Sun Sep 14, 2008 7:12 am
- Forum: General Discussion
- Topic: Incandescent lamp longevity at half rated voltage
- Replies: 18
- Views: 8125
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...
- Sat Sep 13, 2008 7:25 am
- Forum: General Discussion
- Topic: My first electronics project
- Replies: 18
- Views: 8561
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...
- Thu Sep 11, 2008 1:51 pm
- Forum: General Discussion
- Topic: My first electronics project
- Replies: 18
- Views: 8561
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...