This circuit has the spark duration controlled by a 555 timer. The circuit was found in the 1990 special issue of Radio Electronics Experimenter magazine.
This high impedance circuit uses a 12 V lamp to test voltages in a car. We found it in a Popular...
We found this circuit in a 1994 publication. It uses common components and can measure frequencies from 0...
This receiver can tune in the 3 to 12 MHz band with good sensitivity and selectivity, using a good...