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2. Transistor radio - Wikipedia

   en.wikipedia.org/wiki/Transistor_radio

   A classic Emerson transistor radio, circa 1958. A transistor radio is a small portable radio receiver that uses transistor-based circuitry.Previous portable radios used vacuum tubes, which were bulky, fragile, had a limited lifetime, consumed excessive power and required large heavy batteries.

3. Regency TR-1 - Wikipedia

   en.wikipedia.org/wiki/Regency_TR-1

   A 22.5 volt battery provides power, since the only way to get adequate radio frequency performance out of early transistors was to run them close to their collector-to-emitter breakdown voltage. The current drain from this battery is only 4 mA, [ 7 ] allowing 20 to 30 hours of operation, in comparison to only several hours for the portable ...

4. Solar-powered radio - Wikipedia

   en.wikipedia.org/wiki/Solar-powered_radio

   Sarkis Acopian invented the first solar-powered radio in 1957. An experimental model, developed by General Electric, weighed just 10 ounces and was capable of working without light and recharging. It contained seven solar cells, four transistors and a small battery.

5. Wireless microphone - Wikipedia

   en.wikipedia.org/wiki/Wireless_microphone

   Wireless microphone receiver racks backstage at a large televised music awards event Wireless microphone and radio receiver. There are many types of receiver. True Diversity receivers have two radio modules and two antennas. Diversity receivers have one radio module and two antennas, although some times the second antenna may not be obviously ...

6. Philco - Wikipedia

   en.wikipedia.org/wiki/Philco

   Until the mid- to late-1920s, all radios except crystal sets were powered by vacuum tube batteries which were expensive, needed frequent charging, and leaked battery acid, reducing the wife approval factor in the home. A very successful August 1925 Philco consumer product, called the "Socket Power Battery Eliminator", was a rectifier unit which ...

7. 25 Unique Gift Ideas For Every Man In Your Life - AOL

   www.aol.com/news/25-unique-gift-ideas-every...

   Price: $339.99 plus additional $20 off coupon at Amazon ANCHEER Electric Bike Scoot around town, especially if it’s just a few miles away from school or work, with this beginner-friendly ANCHEER ...