Circuit audio pre-amplifier integrated circuit LM358 dual op amp

The LM358 series consists of two independent, high gain, internally frequency compensated operational amplifiers which were designed specifically to operate from a single power supply over a wide range of voltages. Operation from split power supplies is also possible and the low power supply current drain is independent of the magnitude of the pow
Circuit audio pre-amplifier integrated circuit LM358 dual op amp - schematic

er supply voltage. Application areas include transducer amplifiers, dc gain blocks and all the conventional op amp circuits which now can be more easily implemented in single power supply systems. For example, the LM358 series can be directly operated off of the standard +5V power supply voltage which is used in digital systems and will easily provide the required interface electronics without requiring the additional ±15V power supplies. In the linear mode the input common-mode voltage range includes ground and the output voltage can also swing to ground, even though operated from only a single power supply voltage. This circuit can be used in various situations where it is necessary to amplify the audio signal of low intensity, for example: How a microphone preamplifier. This present version is mono but if you need to mount a stereo just use two equal units. When mounting the amplifier pre check all connections and components if everything is correct, connect the circuit to a battery source or in the range 90 to 30 Volts Apply an input signal that can be for example a microphone and then adjust the 470K trimpot until the signal level suitable for your application The adjuster will adjust the signal from 0 to maximum volume. To make connections to the input signal and the power amplifier to use shielded cables to avoid noise.

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