LM4819 audio power amplifier circuit
The LM4819 audio power amplifier is a low-voltage, high-performance device ideal for portable audio applications. The input stage utilizes a coupling capacitor (Ci) to block DC offset from the audio signal, ensuring that only AC components are amplified. The resistor (Ri) serves to set the input impedance and can influence the gain of the amplifier depending on its value.
The inverting input terminal (pin 3) is referenced to AC ground, which helps maintain stability and proper operation of the amplifier. The output stage, available at pin 5, is capable of driving various loads, including speakers and other audio transducers. Care should be taken to ensure that the load connected to the output does not exceed the amplifier's specifications to prevent distortion or damage.
The shutdown feature, controlled by pin 1, allows for power management in applications where battery life is critical. By connecting this pin to VDD, the amplifier enters a low-power OFF state, effectively reducing power consumption when the audio output is not needed. Conversely, connecting the shutdown pin to ground enables full power operation, allowing the amplifier to deliver maximum output to the load. It is essential to avoid leaving the shutdown pin unconnected, as this may lead to unpredictable behavior or excessive current draw.
Overall, the LM4819 provides a robust solution for audio amplification in compact electronic designs, with features that enhance usability and efficiency. Proper implementation of the input and shutdown configurations is crucial for optimal performance in various applications.As shown for the LM4819 audio power amplifier. An audio signal input through Ci, Ri coupling applied to the amplifier inverting input terminal (4 feet), and the amplifier inverting input terminal (pin 3) is AC ground, the amplified signal from the output of 5,8 feet. 5,8 feet of indirect load, such as a speaker, thereby constituting the inverter power amplifier circuit. To avoid shutdown current, Shutdown feet (1 foot) should be connected to VDD (OFF state) or ground (full power state), Shutdown feet do not suspended).
Related Circuits
Initially, the circuit was connected to a 9V battery, which registered approximately 8.3 volts on a multimeter, within the operating voltage range for the LM386 as indicated in its datasheet. The output was characterized by significant noise, including crackling...
This is another UHF-TV preamplifier circuit diagram that is simpler than the previous UHF TV preamplifier. This circuit is based on the MPSH10 transistor. Alternatives that can be used to replace the MPSH10 include the BF180 and BCY90. The...
The DC motor E inversion control circuit utilizes a loop configuration with various relay contacts. It employs a single set of normally open/normally closed relay contacts. When both inputs A and B are low, relay KI is activated. In...
The zero volt switching circuit generates a trigger pulse at the zero crossing of the AC voltage. To facilitate this, the zero crossing of the 555 limit comparator is connected to a single form, with the comparison voltage set...
The motorcycle anti-theft alarm circuit consists of a detection alarm circuit, a charging circuit, and an anti-theft control circuit, as illustrated in figure 7-94. The detection alarm circuit includes a mercury switch (S1), resistors (R1-R3), a capacitor (C), transistors...
This is likely the simplest radio transmitter available, consisting of five components and capable of being assembled in a compact space. It is suitable for science fair projects or other science-related endeavors where short-range transmission is beneficial. The device...