Using JFETs, this circuit from a 90’s American documentation can generate signals of 0.15 Hz. The JFET can be of any general-purpose type like the BF245 or MPF102.
This dimmer for incandescent lamps was obtained from an American 1990s documentation. The circuit...
In the figure we have the circuit of an amplifier for alternating signals with 10 times gain,...
This 80's circuit can be used in media recovery. The integrated circuit is of the time, but modern...