Found on an 80's Elektor, this circuit uses common components, being the diode a general purpose germanium. The coils select the frequency range of the indicator that reaches 60 MHz.
This circuit was found in an ancient American documentation. Used integrated circuits are uncommon...
This circuit obtained in a 1965 magazine indicates when all signal from a transmitter is going to the...
This traditional crystal oscillator configuration can use any CMOS gate configured as an inverter. R1...