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 was published in a recent magazine as a past project. It is a crystal radio from...
When powering this circuit by activating S1, the lamp turns on smoothly in a time determined by...
This circuit consists of an amplifier for signals from the FM band. We found it in an old...