This FM stereo demodulator circuit that use phased lock loop techniques to regenerate the 38kHz subcarrier is designed using the LM1800 integrated circuit .
The LM1800 integrated FM stereo demodulator circuit has numerous features like :
automatic stereo/monaural switching , 45 dB power supply rejection ,wide operating supply voltage range ,excellent channel separation .
A very simple FM transmitter circuit can be designed using MC2833 integrated circuit, designed for cordless telephone and FM communication equipment. It includes a microphone amplifier, voltage controlled oscillator and two auxiliary transistors.
This fm transmitter circuit is a very simple and require few external components and operates in FM band above 100 MHz.
This fm transmitter circuit needs to be powered from a 9 volts battery or from another 9 volts regulated power supply .