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 configuration, different from Motorola's 1990 Linear Databook, uses a voltage reference...
This ultra-low consumption circuit was originally designed to be powered by a solar panel or small...
This double-T sine wave oscillator was found in the December 1995 issue of Electronics Now...