HiFi Stereo FM Demodulator LM4500

HiFi Stereo FM Demodulator LM4500

Wednesday, July 18th, 2018 - RF Circuit

The circuit of hifi stereo FM demodulator LM4500 serves to obtain stereo audio signal from an FM receiver circuit which is still mono. FM stereo demodulator circuit is installed after the section FM detector. Applications circuit hifi stereo FM demodulator LM4500 can be used to restore the stereo signal from an FM stereo transmitter at the radio circuit AM / FM IC SA2132 previous article. Hifi strereo FM demodulator circuit with LM4500 IC is simple enough to be made. Schematic drawings and parts lists to create a circuit of hifi stereo FM demodulator LM4500 can be seen in the following figure.

Circuit Of Hifi Stereo FM Demodulator LM4500

HiFi Stereo FM Demodulator LM4500

Feature Of Hifi Stereo FM demodulator LM4500

IC LM4500 is an IC chip specifically designed as a stereo FM demodulator with high fidelity (hifi). Feature owned IC according datasheet LM4500 is as follows.

  • Low distortion 0.1%
  • High subcarrier harmonic rejection
  • Large input dynamic range of 2.5 Vp-p
  • Voltage controlled blend
  • High separationÐfixed or adjustable
  • Adjustable gain
  • Reduced stereo-mono DC shift 5 mV
  • 55 dB supply ripple rejection
  • Low output impedance
  • Requires no external inductors
  • Wide supply range of 8V-16V
  • Excellent rejection of 57 kHz subcarrier ARI

FM stereo demodulator circuit with IC LM4500 stereo has an indicator that lights up when receiving a stereo signal circuit. Switch mono / stereo is used to select the working mode IC LM4500 for mono and stereo options. VR 5 Kohm serves to adjust the stereo demodulation signal, Adjust the position of VR is to obtain a stereo FM audio signal and the LED lights up.

The circuit of hifi stereo FM demodulator LM4500 works with 8-16 VDC voltage

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