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 obtained in an old American documentation. The integrated circuit used is...
RF or even switching transistors like the 2N2222 can be used in this circuit. The capacitors are ceramic...
This is a variation of the two previous circuits but controlling two LEDs. The brightness of the...