This wide-range radiation monitor was found in a 1980s documentation. The circuit uses a diode as a sensor and is quite critical requiring shielding shown in dashes to prevent snoring due to gain.
The SH-205R receiver was sold in the 1960s in Japan. It used two germanium transistors and had a...
Using contemporary germanium transistors, this oscillator from a 1954 documentation requires...
Found in a Popular Electronics from the 90s, this amplifier uses an operational amplifier of the time....