Found in Electronic Design, this circuit with the 555 has the extended times by using the transistor in the timing network.
We found this circuit in a magazine 73 from the 90's. It is a circuit indicated for radio-amateur...
In the figure we have a 9V source using a 5V 7805 regulator. The circuit is from an American...
If you have an old cassette player or bought one from a junk shop, you can set up a small table...