Posted on Jul 13, 2012

On most FM tuners, the stereo indicator lights upon detection of the 19-kHz pilot tone. However, this doesn`t mean that the program is actually stereophonic, since the pilot tone is often transmitted with mono programs also. A similar situation exists on stereo amplifiers, where the stereo LED is simply controlled from the mono/stereo switch. The LED-based stereo indicator described here lights only when a true stereo signal is fed to the inputs.

Click here to download the full size of the above Circuit.

Differential amplifier Al raises the difference between the L and R input signals. When these are equal, the output of Al remains at the same potential as the output of A2, which forms a virtual ground rail at half the supply voltage. When Al detects a difference between the L and Rinput signals, it supplies a positive or negative voltage with respect to the virtual ground rail, and so causes C3 to be charged via Dl or C4 via D2. Comparator A3/A4 switches on the LED driver via OR circuit D3/D4. The input signal level should not be less than 100 mV to compensate for the drop across Dl or D2. The sensitivity of the stereo indicator is adjustable with Pl.

Leave Comment

characters left:

New Circuits



Popular Circuits

Circuit Delay and Speakers Protektor Using TL071
TDA9813T TDA9813T VIF-PLL With QSS-IF And Dual FM-PLL Demodulator
300B solid state
Linear RF Power Meter
Analog to Digital Converter
Solid-State Tesla Coil 2
Triac dimming circuit diagram
Satellite receiver antenna servo control circuit diagram