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 traditional 3-channel mixer configuration with FET appears elsewhere on this site. The FET...
This circuit divides the frequency of a 2 kHz signal by 2. The circuit was found in Philips...
We found this transmitter for the 70 to 90 MHz band (FM in Japan) in a Japanese publication at the...