The two integrated circuits used in this configuration can still be found. The frequencies of the effects are determined by the capacitors, which may have their values changed.
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...