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.
With this simple circuit found in an American 1980s documentation, it is possible to determine the...
This page shows a crystal oscillator for 2 MHz. Other frequencies can be produced depending on the...
This is a converter stage found in old transistor superheterodyne radios. The circuit is for...