This circuit was obtained from an old Signalite documentation. Neon lamps are special types of the time. The operation occurs at low frequencies.
To use the instrument for AC measurement, the tips are A and B. For CC use tips A or B for...
The interesting circuit shown in the figure, can have its gain digitally controlled and present two...
This simple MW radio was found in a 1975 publication, but it can be mounted with BC548...