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A higher channel separation stereo encoderr built with 3 iC’s 4066, 4047, 4013 and 741. It has a filter L, C5 for frequencies higher than 15kHz and an extra audio amplifier built with 741. This stereo encoder has a better design than this stereo encoder circuit but the principles are the same.
Stereo Encoder schematic components:
This 1 Hz and 2Hz generator or oscillator is built with 4060 as an oscillator and a 14 bits counter. To obtain a 1Hz signal after 4060 we use 1/2 4013. This circuit provides a rectangular voltage with a amplitude between 0V and the power supply voltage.
To adjust this 1Hz generator connect to pin 9 a frequency meter and adjust C2 untill shows 32,768KHz.
SFH505A made by Siemens combine infrared diode receiver, amplifier, demodulator and a filter band pass for minimizing interferences. This circuit work together with this infrared transmitter.
The output signal of IC1 has the impulse duration limited to a maximum value. This fact is exploited by the associated transmitter for obtain a maximum radius action.
This stereo audio switch circuit allows that with only one switch to select one of the four stereo channels. The internal switching is made posible with CMOS components.
Each switch input includes a voltage divider to allow the switch to work in the linear zone of the characteristics, this ensures low audio signal distorsions.
