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.
Found in old American documentation, this circuit can divide the frequency of a signal by 2 or 3...
The transistors of this timing circuit may be more modern types such as BC548 and BC558. The...
An OR gate can be improvised using NAND gates of a 4001 as shown here. The diodes are...