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 sensor uses a capacitive system that oscillates at 45 MHz with the empty glass tube. Its...
We found this CMOS circuit based on the PLL4046 in the December 1989 issue of Radio Electronics magazine....
This 1967 Electronics World circuit is suitable for frequencies up to 1 MHz. The setting applies...