I think you're right about this. But you have to filter the 12 V supply very well because there is much noise coming from the car.Rope said:In this way my final suggestion is -use single supply OPAMP and use the car's 12V Vcc power supply for this preamplifier!!
This mean thart you should connect a 6.2 kohm resistor as shown at page 17.For ac applications, where the load is capacitively coupled to the output of the amplifier, a resistor should be used, from the output of the amplifier to ground to increase the class A bias current and prevent crossover distortion. Where the load is directly coupled, as in dc applications, there is no crossover distortion. Capacitive loads which are applied directly to the output of the amplifier reduce the loop stability margin. Values of 50 pF can be accomodated using the worst-case non-inverting unity gain connection. Large closed loop gains or resistive isolation should be used if larger load capacitance must be driven by the amplifier.
The MAX865 is a CMOS charge-pump DC-DC converter in an ultra-small µMAX package. It produces positive and negative outputs from a single positive input, and requires only four capacitors. The charge pump first doubles the input voltage, then inverts the doubled voltage. The input voltage ranges from +1.5V to +6.0V. The internal oscillator is guaranteed to be between 20kHz and 38kHz, keeping noise above the audio range while consuming minimal supply current. A 75ohm output impedance permits useful output currents up to 20mA.
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