One hundred years ago this month, the April 1923 issue of Popular Science carried the plans for this one-tube regenerative radio receiver, which was said to be able to pull in concerts from a hundred miles away. The total cost, including headphones, was under twenty dollars. And if the reader already had a crystal set, […]
The May 1962 issue of Electronics Illustrated showed this smart-looking regenerative receiver kit from Allied, the Knight Kit “DX’er”, a three-transistor regenerative receiver for the broadcast band and one shortwave band. It operated with four penlight cells, and Allied touted the receiver as ideal for the fallout shelter. It does seem like an ideal choice. The […]
This simple regenerative receiver circuit appeared in Popular Science a hundred years ago this month, May 1920. It was sent in to the magazine by one Edward T. Jones, who reported that it used a resonant antenna, connected by what he called a “balancing circuit.” He reported that this circuit drew signals from the antenna […]
This handsome little two-tube shortwave receiver is described in the May 1934 issue of Short Wave Craft magazine. The circuit was designed by the National Radio Distributing Co., which presumably had all of the parts for sale, and used two type 30 tubes. A 45-volt B battery was sufficient for normal reception, but to pull in […]
Seventy-five years ago this month, the February 1943 issue of Popular Science carried the plans for this one-tube combination receiver and code practice oscillator. The construction article, by Arthur C. Miller, noted that thousands of young men and women were learning code for civil defense purposes or prior to enlistment in the Signal Corps. A […]
Eighty years ago, the January 1938 issue of Shortwave and Television magazine carried the plans for this two-tube regenerative shortwave receiver. With plug-in coils, the set would cover 550 through 9 meters. The set used two 1.5 volt tubes: The RK42 triode served as regenerative detector, and a dual RK43 provided two stages of audio […]
Earlier this year, we posted a diagram of a regenerative receiver from January 1916, which was probably the first construction article detailing such a receiver. The December 1916 issue of the same magazine, Electrical Experimenter, contains this diagram of an unusual regenerative set. This is basically two receivers, with the most expensive parts, the audion tube […]
Fifty years ago, the “Beginner’s Corner” of the November 1966 issue of Electronics Illustrated carried three circuits for basic radio receivers. The first was the crystal set, the second added one stage of audio amplification, and the third was this basic regenerative set. The tuner was a ferrite loopstick coil, which were available in abundance for […]
The plans for this simple one-tube regenerative shortwave receiver appeared in Popular Science 80 years ago this month, July 1936. It used a single 6C5 metal triode. The tube, as well as the other components, are readily available, although the modern components might have a slightly different look. According to the author, the set’s volume […]
The plans for this little one-tube regenerative receiver appeared in Shortwave Craft magazine 80 years ago this month, May 1936. It runs off household current, using a 12A7 tube, which is a dual tube containing a rectifier and pentode. The rectifier supplies the B+, and the pentode is a regenerative detector. Plug-in coils are used, for […]