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.
This simple digital frequency meter using CMOS circuits reaches 5 MHz frequency. Input signals are...
This stage circuitry for amplifying microphone signals makes use of germanium transistors as indicated...
This configuration with the 741 Operational Amplifier has an NAB equalization for magnetic...