This shield circuit for lamps and other charges was found in a Popular Electronics from the 90's. The MOSFET admits equivalent according to the charging current.
This SCR relaxation oscillator was found in old documentation. The SCR can be TIC106 and the...
The oscillator shown in the figure generates a 1 kHz tone that is reproduced on the speaker with...
Suggested by an Electronics Now magazine from April 1994, these circuits can be used as output...