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.
The simplest flip-flop can be built with two NAND gates as shown here. This is a Reset-Set [S-R]...
This circuit is suggested by RCA and is based on a dedicated integrated circuit that is the...
June 2017 - Vishay Siliconix's new Generation IV (Gen IV) Channel N MOSFETs can now be purchased...