Here is a 1.5V FM transmitter circuit diagram. This circuit can broadcast your voice around your house. We can also say it whole house FM transmitter. This circuit is using 1.5 volt DC battery, you can also use small 1.5V watch battery to power the circuit. L1 is equal to 5 turns of 0.7mm
enameled wire wound on 3mm form. This wireless transmitter is able to transmit at a distance of 30 meter.
Note: This circuit is for educational purpose only.