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.
Based on the 555, this circuit was obtained from Internet documentation, serving to generate a...
Found in American documentation from 1968, this circuit uses both diodes and a neon lamp to...
We found this electronic analog multimeter in a 1998 documentation. What sets it apart from...