Marketing[ edit ] Altoids are less widely available in Britain —their country of origin—than in the US to which they are exported. The mints are stocked in Morrisons. This was done to manufacture the products closer to where they are primarily marketed.
The earliest practical use of crystal radio was to receive Morse code radio signals transmitted from spark-gap transmitters by early amateur radio experimenters.
Early years[ edit ] Crystal radio kept at Altoids projects Museum of the radio - Monteceneri Switzerland Early radio telegraphy used spark gap and arc transmitters as well as high-frequency alternators running at radio frequencies. The coherer was the first means of detecting a radio signal.
These, however, lacked the sensitivity to detect weak signals. In the early 20th century, various researchers discovered that certain metallic mineralssuch as galenacould be used to detect radio signals.
On August 30,Greenleaf Whittier Pickard filed a patent for a silicon crystal detector, which was granted on November 20, The most common crystal used is a small piece of galena ; pyrite was also often used, as it was a more easily adjusted and stable mineral, and quite sufficient for urban signal strengths.
Several other minerals also performed well as detectors. Another benefit of crystals was that they could demodulate amplitude modulated Altoids projects. Crystal sets represented an inexpensive and technologically simple method of receiving these signals at a time when the embryonic radio broadcasting industry was beginning to grow.
This design was significant in bringing radio to the general public. NBS followed that with a more selective two-circuit version, Construction and Operation of a Two-Circuit Radio Receiving Equipment With Crystal Detector, which was published the same year  and is still frequently built by enthusiasts today.
In the beginning of the 20th century, radio had little commercial use, and radio experimentation was a hobby for many people. In addition to reporting on special events, broadcasts to farmers of crop price reports were an important public service in the early days of radio.
Infactory-made radios were very expensive. Since less-affluent families could not afford to own one, newspapers and magazines carried articles on how to build a crystal radio with common household items.
To minimize the cost, many of the plans suggested winding the tuning coil on empty pasteboard containers such as oatmeal boxes, which became a common foundation for homemade radios.
Crystodyne[ edit ] In early s RussiaOleg Losev was experimenting with applying voltage biases to various kinds of crystals for manufacture of radio detectors. The result was astonishing: After the first experiments, Losev built regenerative and superheterodyne receivers, and even transmitters.
A crystodyne could be produced in primitive conditions; it can be made in a rural forge, unlike vacuum tubes and modern semiconductor devices. However, this discovery was not supported by authorities and soon forgotten; no device was produced in mass quantity beyond a few examples for research.
It uses a pencil lead attached to a safety pin pressing against a razor blade for a detector. In addition to mineral crystals, the oxide coatings of many metal surfaces act as semiconductors detectors capable of rectification. Crystal radios have been improvised using detectors made from rusty nails, corroded pennies, and many other common objects.
When Allied troops were halted near Anzio, Italy during the spring ofpowered personal radio receivers were strictly prohibited as the Germans had equipment that could detect the local oscillator signal of superheterodyne receivers.
Crystal sets lack power driven local oscillators, hence they could not be detected.I love it when you love my work! All tutorials and photos published at Happy Hour Projects are copyrighted.
If you would like to feature my tutorial on your website or share it on your social media you may use one photo to feature, as long as you provide a link back to the original post.
If you feature a photo, it may not be accompanied by the project tutorial or recipe, whether in my own. Browse altoids tin crafts, patterns and tutorials on initiativeblog.com, an online crafting community.
Our forums can be accessed without membership. The RFM-V is a complete vehicular kit solution for the AN/PRCG manpack radio. The RFM-V comes with a 50 watt amplifier, shock mount, cabling, multiband whip antenna with mount, tactical speaker, GPS antenna, and an X-Wing SATCOM on-the-move antenna.
Build Your Own USB Charger It's simple! Just add electronics to an Altoids can The USB Plan Lots of electronics are powered from a USB cable, so I figured that a powered USB port would be the most useful power source.I used a voltmeter to measure the voltage on each of the pins on my iPod AC Adapter, and wound up with +V on the V+ pin, +V on the D- pin, and +V on the D+ pin.
Altoids Tin Crafts You can reuse an Altoids tin for just about anything: a pillbox, hairpin holder, craft supplies. Larger ones can be reused as a mini sewing kit, or .
Find this Pin and more on Geeky Altoids Tin Projects by Charles Buchwald. This is my entry for the Brave the Elements Contest. An Altoids tin has a lot of great uses, from phone chargers to storing coins etcetera, this is the.