This is a FM Wireless Microphone circuit Which we add one transistor in the RF amplifier. So this circuit have two resonance circuits and also two trimmers. This cause have Higher efficiency and transmission far up.
More circuits about oscillator, pulse, frequency , and others.
This am radio receiver circuit with earphone is a saving version that use a few parts, cheap , easy to build and suitable to be assembled to study,3V batt.
This is Wide band high frequency amplifier circuit,Wide frequency band between 75-150 MHz,Using transistors to enhance signal strength FM or amateur radio [...]
This the fm wireless transmitter circuit, the truth is one kind microphone that developed to be used without a cable from the microphone to the amplifier.
If you looking for simple frequency divider circuit. This may be suitable for you. It will divide a frequency of input signal into just half to output.
This is long range fm transmitter circuit in VHF range. As Figure 1 Sonar with up to 2 watts, when used with a supply voltage of about 24V.