This simple injector circuit can actually be powered by voltages from 3 to 9 V. The frequency is given by C1 which can be between 4.7 and 10 nF. The CMOS can also be 4011.
This is a conventional double T oscillator, where the frequency is determined by the double T...
In this circuit of an American publication of 1978, the integrated circuit may be the 4001 and the...
We find this circuit in a 1995 documentation. It warns when the timing is nearing its end, with...