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 circuit suggested by Linear Technology in a 1980s documentation. The integrated circuit is from...
This circuit is used in the analog part of the telephone lines. The same circuit can directly...
The circuit shown uses an unusual operation, but can be replaced by an equivalent, and a FET which...