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.
More circuits about oscillator, pulse, frequency , and others.
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.
This is FM transmitter circuit without Coil, using inverter digital IC as main and controlled frequency is precise by a crystal. Figure 1 the circuit diagram In Figure 1 is…