coolcircuits.blogspot.com
Cool Electronics Circuits: Key Chain Light
http://coolcircuits.blogspot.com/2014/06/key-chain-light.html
Electronic Circuit Ideas Collection. Sunday, June 29, 2014. A key chain with a built-in white LED comes in handy to help you at your front door or search your valuables in the dark. The intensity of white LED is 4000 to 5600 mcd (millicandela) at forward voltage of 3.6V and forward current of 20 mA. Fig 1: Circuit for key chain light. Fig 2: Suggested enclosure for key chain light. The white LED beam, when viewed directly, can harm the eyes. Subscribe to: Post Comments (Atom). Infolinks In Text Ads.
coolcircuits.blogspot.com
Cool Electronics Circuits: 24V Battery Chargers
http://coolcircuits.blogspot.com/2011/02/24v-battery-chargers.html
Electronic Circuit Ideas Collection. Tuesday, February 22, 2011. For those of you who are looking for battery charger circuit. Here is some reference circuit 24V battery charger. For lead acid. The 24v charger. Is using several variable voltage regulator IC such as LM350K and LM317K. For those who want to create. With high current, it is advisable to use as a source of DC voltage transformers. Because quite easy to arouse the current, just based on how the capacity of the transformer you have. Contains 6...
hamantennas.blogspot.com
HAM Antenna Resources and Informations: Jun 20, 2014
http://hamantennas.blogspot.com/2014_06_20_archive.html
HAM Antenna Resources and Informations. Collection of Amateur Radio Antenna Projects and informations. Friday, June 20, 2014. Http:/ www.radiowymsey.org/FanDipole/fandiploe.htm. Links to this post. For this antenna the Antenna Matching Unit should be at the base of the antenna, for best performance, and can be remotely controlled. Links to this post. A Tree Friendly 2 Meter Halo Antenna. The Halo is certainly not a new design. Laurence M. Leeds and Marvel W. Scheldorf obtained a patent for th...Building ...
coolcircuits.blogspot.com
Cool Electronics Circuits: June 2014
http://coolcircuits.blogspot.com/2014_06_01_archive.html
Electronic Circuit Ideas Collection. Sunday, June 29, 2014. A key chain with a built-in white LED comes in handy to help you at your front door or search your valuables in the dark. The intensity of white LED is 4000 to 5600 mcd (millicandela) at forward voltage of 3.6V and forward current of 20 mA. Fig 1: Circuit for key chain light. Fig 2: Suggested enclosure for key chain light. The white LED beam, when viewed directly, can harm the eyes. Wideband RF Field Strength Meter. LT5534 can detect RF signal f...
hamantennas.blogspot.com
HAM Antenna Resources and Informations: Wideband RF Field Strength Meter
http://hamantennas.blogspot.com/2014/06/wideband-rf-field-strength-meter.html
HAM Antenna Resources and Informations. Collection of Amateur Radio Antenna Projects and informations. Sunday, June 29, 2014. Wideband RF Field Strength Meter. LT5534 can detect RF signal from 50MHz all the way up to 3GHz, which covers most of the spectrum one typically uses. If your frequency spectrum is significantly different, you may check out the other RF detection chips the above mentioned companies offer. Subscribe to: Post Comments (Atom). J Pole antenna Links. Wideband RF Field Strength Meter.
hamantennas.blogspot.com
HAM Antenna Resources and Informations: Jul 6, 2014
http://hamantennas.blogspot.com/2014_07_06_archive.html
HAM Antenna Resources and Informations. Collection of Amateur Radio Antenna Projects and informations. Sunday, July 6, 2014. Make a magnetic loop antenna for 7-21 mhz. This antenna has several advantages, not least being only 1 metre diameter! So what are its disadvantages? Magnetic loop dimension details. Diameter of loop 1000mm. Diameter of tube 15mm. Width of base 780mm. Diameter of support pipe 42mm. Loop end spacing (for tuner) 50mm. Height of support 1590mm. Gamma match width 310mm. Force some timb...
ham-antennas.blogspot.com
Ham Antenna Blog: May 2014
http://ham-antennas.blogspot.com/2014_05_01_archive.html
Collections of Ham Radio antenna projects from web. Saturday, May 31, 2014. Historical Events in Amateur Radio. 1894-1899- Marconi conducts his wireless experiments in Europe and sends a message across the English Channel. 1901-Marconi sends a wireless signal across the Atlantic. 1900-1908- Thousands experiment with wireless. Few at this time are interested in it as a hobby only. 1904-J.A. Fleming develops the 2 element (Diode) vacuum tube. 1914-1917- The number of amateur radio stations increases. T...