This low frequency sinusoidal oscillator was obtained in documentation from the 1970s. Operational equivalents can be used. The FET is a general-purpose type.
This circuit was obtained in a documentation for radio amateurs in 1974. The coil consists of 12...
This simple alarm for doors and windows was found in a Japanese publication from the 1960s. The...
This is a circuit of the 80's ON Semiconductor thyristor manual. Of course, the configuration can be...