To get the cost of a transistor set down to $10, TI developed dozens of processes to improve quality and performance. In only a few months, TI developed a method for mass producing inexpensive high-frequency transistors. In June 1954, TI and IDEA agreed to build a transistor-based radio under the Regency label that would be ready for Christmas. TI searched for a manufacturing partner, and found it in IDEA, which had set up a consumer products division called Regency and employed a staff of capable and talented engineers who were familiar with building products for the general public. TI’s early prototypes used eight transistors, which was too costly for a product that Haggerty hoped to sell for $50-more than a conventional tube radio, but not too much to pay for an exciting new product. Haggerty committed a huge portion of TI’s budget ($2 million for a company that generated $25 million in revenue) to this research. Haggerty understood that scaling up production would drive down the future costs of transistors. So he decided to find an application for germanium transistors that could be produced in volume. Nevertheless, this technology was too expensive for the consumer market, and Haggerty wanted TI to dominate the mass production of transistors before his competitors could catch up. By May 1954, TI surprised its rival licensees by making silicon transistors that worked. Haggerty pushed TI’s engineers to develop transistors made of silicon, rather than germanium, because they could work at higher temperatures and therefore have more applications in the industrial and military markets. TI’s vice president, Pat Haggerty, bet that transistors could be used to miniaturize consumer products and turn his small company into an electronics giant, and joined about two dozen other licensees experimenting with the technology. Early transistors were fragile and difficult to control, and Bell Labs hoped that by licensing the technology at the relatively low cost of $25,000, its quality would improve. Although transistor technology had existed since 1947, the major radio builders continued to produce receivers using vacuum tubes. Meanwhile, in 1951, Texas Instruments (TI), an instrument maker for the oil industry and the Navy, decided to license the technology for constructing solid-state silicon transistors from Bell Labs. Setting up shop in Indianapolis after World War II, they developed a successful line of signal boosters to improve television reception in rural areas. IDEA (Industrial Development Engineering Associates) was a corporation founded by two former RCA engineers, Joe Weaver and John Pies. The era of portable electronics had begun. This circuit operates with a 9-volt battery.On 18 October 1954, in Dallas, Texas Instruments announced the first commercial transistor pocket radio, the Regency TR1, created in collaboration with IDEA Corporation and available in time for the holiday shopping season. Although there are various manners by which a radio signal might be regulated, one of the easiest is to change its amplitude by varieties of sound.įurthermore, for making 200uH curl take a #26 enameled copper wire and wound 60 turns on a 1cm diameter and 7.6cm long ferrite bar. All together that a radio signal can convey sound or other data for broadcasting or two-way radio broadcasting, it must be adjusted or changed simultaneously. The slightly moderate variations in the amplitude make a loop that shows the frequencies in the sound signal. Moreover, the amplitude of the carrier wave isn’t steady. It is about 550kHz to 1600kHz versus 20Hz to 20kHz. The base frequency of the electromagnetic radio wave is a lot higher than the frequency of the sound data it conveys. All the required components of this circuit are easily accessible in the market. Moreover, the circuit is not utilizing many additional parts or components to make a good quality AM receiver. Yet it isn’t utilizing a crystal, it is utilizing a high gain pre-amplifier phase of transistor BC 549 and BC 548. The circuit diagram referenced here is additionally a basic AM radio circuit. In our previous articles, we talked about a basic crystal radio receiver circuit. For a detailed description of pinout, dimension features, and specifications download the datasheet of BC549 AM Radio Circuit Working Explanation
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