Here you ask yourself the question of how to "cross-couple" or "mutually couple" two circuits. Take a look at the circuits shown.
In the circuit diagram shown on the left, the electronic switch is shown schematically. The circuit has two states. The transistor T blocks or switches through.
In the circuit diagram shown on the right, the electronic switches are cross-coupled by the coupling elements CE1 and CE2. In this way, the transistors are no longer independent. As a general rule...
The circuit thus switches between two states back and forth. This is a multivibrator.
But which coupling elements are used...?
You are exploring these circuits in the following experiments...