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 circuit is in the very datasheet of Texas Instruments that manufactures the component...
This circuit came out in a Frances Toute LÉlectronique magazine from July 1978, but can still be...
In the figure we have a high stability voltage reference, providing a voltage of 10 V at the...