Found in Electronic Design, this circuit with the 555 has the extended times by using the transistor in the timing network.
This circuit was found in a publication in 2002 and can be powered by voltages from 5 to 12 V. The...
Found in an American 80's documentation, this circuit can use common FETs like the BF245 and cover...
Found in a publication for radio amateurs from the 1980s, this circuit amplifies signals in the 60...