We found this configuration in a 1990 Poptronics. The circuit can be powered by voltages between 6 and 15 V, changing the resistors in series with the LED. The frequency is set at R7.
Figure bellow shows how n 4027 can be cascaded to form a divide-by-2. The maximum input frequency...
This circuit was published in the February 1970 issue of Radio Electronics magazine. The circuit uses...
The circuit shown in the figure generates a rectangular signal that depends on R and C, when its...