This traditional crystal oscillator configuration can use any CMOS gate configured as an inverter. R1 has values from 1 to 5 M ohm and R values around 10 k.
This low noise preamplifier has a gain of 19 dB in the 30 MHz band. The circuit is from the 80s....
The transformer of this experimental circuit, which appears in other versions on the website, is...
This circuit is from a 1968 documentation using one of the first integrated circuits available at the...