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.
The bipolar transistors can be the BC548 and the FET a BF245. This configuration has a time...
The circuit shown in the figure can generate signals up to 1.6 GHz. Coil L1 and capacitor C2 are...
This circuit shows how to control an astable configuration using the 555 IC. The control signal is...