This circuit is from a 1967 publication. The configuration holds true for modern transistors having a feedback across R2.
Found in an Electronic Design from the 90s, this circuit makes use of integrated regulators of the time....
We found this circuit in Mullard's 1960s transistor manual. The circuit oscillates at 800 Hz, the...
In fact, the 556 consists of a double 555, which can be replaced by these integrated ones. The...