We found this circuit in the November 1974 Radio Electronics magazine. The capacitors determine the output time, and it is normal to obtain 1 second for each uF used.
This voltage regulator step can be used for a variable source from 0 to 30 V with a maximum output...
This circuit was found in Popular Electronics from February 1967. Transistors are from the period....
In this oscillator circuit using 3 TTL inverters we have all the conditions for the frequency...