An very simple FM Stereo Demodulator circuit that use phased lock loop techniques to regenerate the 38kHz subcarrier can be constructed using the LM1800 integrated circuit .
The LM1800 integrated FM stereo demodulator has numerous features like :
automatic stereo/monaural switching , 45 dB power supply rejection ,wide operating supply voltage range ,excellent channel separation .
Particularly attractive for this circuit are the low external part count and total elimination of troublesome tuning coils , all tuning requirements are made using a single inexpensive potentiometer .
As you can see in the circuit diagram this lm1800 fm stereo demodulator has a 100mA stereo indicator lamp driver.
For this LM1800 Phase-Locked Loop FM Stereo Demodulator circuit , you will need an dc power supply that can provide an output voltage between 10 and 18 volts .
Also if you can not find the LM1800 Phase-Locked Loop FM Stereo Demodulator circuit on the market you can use the UA758 ic which is pin-to-pin compatible with LM1800 .