This circuit was obtained from an American documentation from 1976. The circuit has a dynamic range of 100 kHz. FETs may be replaced by current equivalents.
This circuit of an old publication produces the insect-like noise that drives them away. The...
Found in American documentation this circuit uses transistors of the time. The circuit can be made...
G This neon lamp indicator was suggested by General Electric in 1970 documentation. Virtually any neon...