AN7415 FM Stereo Demodulator

The circuit shown below is of a PLL FM stereo demodulator designed Depending the AN7415. C1 is the input coupling capacitor Which blocks any DC voltage present at the multiplexed input signal. LED D1 is an indicator LED and R1 is its current limiting resistor. C4 and C5 seem to be the DC decoupling capacitors in to the left and right output channels.

C2 and C3 to be the noise bypass capacitors to the left and right output channels. POT R2 can be used for adjusting the channel separation. Resistor R5 and capacitors C7 and C8 forms a low-pass filter network in to the internal DC amplifier circuitry. C10 is extremely a filter capacitor in to the IC’s internal Schmitt trigger amplifier circuitry.

C9 is extremely a ripple filter capacitor in to the voltage stabilizer circuit inside the AN7415. Resistor R3, POT R4 and Capacitor C6 sets the time constant of these internal VCO circuit. Hence POT R4 can be used for adjusting the VCO frequency. A 19KHz frequency check signal is available at the PIN 12 of these IC. Switch S1 can be used for enabling and disabling forced mono function.

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BH1417 Stereo FM Transmitter

The circuit shown here is of a quality Stereo FM transmitter that might transmit high quality signals up to a variety of 70 feet. The circuit is Depending on BH1417 PLL stereo transmitter IC in one Rhom semiconductors. The IC has separate audio processing sections towards the left and right channels, pre emphasis circuit for improving signal to noise ratio, crystal control circuitry for accurate frequency locking, multiplex circuit for and make sum ( left plus right) and difference ( left minus right).

Another important feature of this IC is that the transmission frequency seem like either set utilizing a 4 channel DIP switch. The IC seem like either powered in one anything between 4 to 6V DC and comes with other an output power around 20mW. At full output power the circuit consumes only 20mA and has a channel separation of 40dB. There {seem to be|appear to be|are} 14 possible preset transmission frequencies, starting in one 88.7MHz and incrementing in steps of 0.2MHz Which is going to be selected utilizing the DIP switch. The PLL circuitry of those IC is so precise that There's almost no frequency drift.

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2001 Volkswagen Passat Radio wiring diagram

schematic wiring diagram the 2001 Volkswagen Passat Radio. The radio system consists of: antenna amplifier, right rear woofer and rear tweeter, right front woofer and tweeter, left front woofer and tweeter, left rear tweeter and woofer, CD changer unit, and lines. The woofers low audio frequencies the tweeters high audio frequencies (typically from around ,000 Hz ,000 Hz)

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