This utilitarian-looking three-tube British device appeared in Practical Wireless 75 years ago this month, January 1949. It has considerable utility, as it functions as both a regenerative receiver and signal generator. The regenerative receiver, of course, causes oscillation that can be radiated through the antenna jack. But this circuit does one better, because it turns […]
The plans for this handsome one-tube receiver appeared a hundred years ago this month, in the January 1924 issue of Popular Science. The regenerative set, when used with a high-quality loudspeaker, was capable of producing volume to fill a large room, with but a single tube. The secret was the antenna coil, which served […]
I remember this colorful receiver on the cover of Elementary Electronics for January 1974. It was a basic regenerative receiver, and used an audio amplifier module to drive the speaker. But it was more than a radio, it was a circuit for the electronics experimenter to play around with something new, the varactor diode. As […]
A hundred years ago this month, the December 1923 issue of the British journal Wireless Weekly showed how to build this two-tube regenerative receiver. The exact frequency/wave length coverage is not stated (quite likely because the author didn’t really know for sure), but it was designed to receive long wave radiotelephone and radiotelegraph signals, as […]
Mom and little sister are busy decorating the Christmas tree, but Dad and Junior are doing something even more exciting: They’re putting together this simple one-tube radio, following the plans in the December 1953 issue of Popular Mechanics. While the circuit is simplicity itself, it’s powerful enough to provide loudspeaker volume. It’s designed for young […]
Seventy years ago this month, the October 1953 issue of Radio News showed how to build this one-tube regenerative receiver, especially designed for the Novice. It used a single 6SN7 dual tube, which served as regenerative detector and audio amplifier. The previous month’s issue of the magazine had showed a companion transmitter and power supply, […]
Eighty five years ago this month, the September 1938 issue of Radio News carried detailed construction details for putting together this two-tube shortwave receiver. It used a 1B4 as regenerative detector, followed by a 1F4 as audio amplifier. The set tuned 160 through 10 meters, and the author advised that the beginner should start on […]
This young woman is now about 90 years old, but in the September 1938 issue of Popular Mechanics, she is shown helping her father pull in a shortwave signal with the simple one-tube receiver described in that issue. It uses an RK-43 dual triode tube as regenerative detector and audio amplifier. The set can be […]
Seventy-five years ago, this young man with large pockets was pulling in a program with this three-tube “pocket size” receiver. He built it according to plans in the August 1948 issue of Popular Mechanics, and the set was ideal for taking to a ball game or on hikes. The regenerative set had a built-in loop […]
The June 1963 issue of QST carried the plans for this five-transistor transceiver for 6 meters. The author, David Light, K4IQU, reported a QSO of 15 miles between two of the units, in hilly terrain, presumably on two peaks within sight of each other. He also reported being heard 30 miles away (but not a two-way […]