SCA decoder

Posted on Jun 4, 2012

The circuit uses a Signetics NE565 PLL (Phase-Locked Loop) as a detector to recover the SCA signal. The input to the SCA decoder circuit is connected to an FM receiver at a point between the FM discriminator and the de-emphasis filter network. The PLL, IC1, is tuned to 67 kHz by R7, a 5 potentiometer. Tuning need not be exact since the circuit will seek and lock onto the subcarrier. The demodulated signal from the FM receiver is fed to the input of the 565 through a high-pass filter consisting of two 510 pF capacitors (CI and C2) and a 4.7 resistor (Rl).

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

Its purpose is to serve as a coupling network and to attenuate some of the main channel spill. The demodulated SCA signal at pin 7 passes through a three-stage de-emphasis network as shown. The resulting signal is around 50 mV, with the response extending to around 7 kHz.

Leave Comment

characters left:

New Circuits



Popular Circuits

Headphone Amplifier
Servo controller with 555
Linear ac analog coupler
Telephone status monitor
Car Parking Sensor Circuit Schematic Free With Explanation
0-1V to 4-20 mA Converter
Lamp Flasher
Sound Effects Alarm Generator
AC Locomotive Auxiliary Equipment
rtc circuit
Strategic Dog Initiative
DIY Circuit Car Battery Charger