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 tests whether electronics are properly protected with internal grounding. If the...
The circuit shown is an AND gate with three inputs using a comparator of the four existing in an...
This latched alarm uses a double relay for this purpose and can control higher power external...