Strong amplifier chips like the LM384 are frequently found in basic electronics.
The volume increase (gain) is regulated at 34 decibels (dB) inside the chip to keep costs down.
Because microphones may readily attach to its ground, this chip is unique.
The chip automatically lowers its power output when it becomes too hot.
In addition, it can manage unintentional short circuits.
Designing circuit boards is made simple by the LM384s conventional rectangular box, which has a metal core for heat dissipation.
Numerous gadgets, including record players, intercoms, signal boosters, teaching machines, alarm clocks, and even devices that utilize sound waves to clean or calculate distance, contain this amplifier chip.
Circuit Working
Parts List:
| Category | Item | Quantity | Notes |
|---|---|---|---|
| Resistor | 2.7Ω | 1 | |
| Potentiometer | 10k | 1 | |
| Capacitors | Ceramic 0.1μF | 2 | |
| Electrolytic 4.7μF 25V | 1 | ||
| Electrolytic 470μF 25V | 1 | ||
| Semiconductors | IC LM384 | 1 | |
| Other | 8Ω speaker | 1 |
Below are the circuit working:
Volume control: To modify the signals intensity a voltage divider circuit with a potentiometer is linked to the LM384 chips input.
Power supply: Capacitor C1 assists in regulating the chips power supply voltage.
Capacitors: To control signal flow and stop undesirable voltage fluctuations, the circuit uses C2 and C4 capacitors at various locations.
Output filter: To improve sound quality, resistor R1 and capacitor C3 combine to act as a filter removing extremely high frequencies from the audio signal before it reaches the speaker.
DC blocking: In order to prevent any direct current DC from damaging the speaker, capacitor C1 also prevents DC from getting to it.
Features of LM384:
The LM384 chip itself is beneficial for amplifier circuits due to a number of features:
- It makes it simple to link input signals to ground.
- Automatically, the output voltage is set to half of the input voltage.
- The chip is shielded against overheating and short circuits.
- Throughout operation the chip is kept cold by the packages metal heat sink.
- Circuits constructed on single or double layered printed circuit boards PCBs can utilize the LM384.
Formulas:
Comprehending the parameters of the LM384 integrated circuit and optimizing its configuration are crucial to designing a 5W audio power amplifier circuit.
The following are the main formulas while designing the circuit:
Load Resistance:
An 8Ω load is intended to be driven by the amplifier.
The output power Pout that is supplied to the load may be computed using the following formula:
Pout = Vpeak2 / 2R
where,
- The load resistance 8Ω is represented by R and the peak voltage swing across the load is represented by Vpeak.
One way to compute the gain G is to:
G = 1+R1 / R2
- To establish the required gain, select the proper resistors for R1 and R2.
Note:
You may successfully create a 5W audio power amplifier circuit utilizing the LM384 IC by according to these instructions and computations.
Modify component values according to your applications particular needs and performance objectives.
How to Build:
To build a Simple 5W Audio Power Amplifier Circuit follow the connections steps mentioned below:
- Gather all the necessary components as shown in diagram.
- Connect pin 1 of IC1 LM384 to ground through capacitor C2.
- Connect pin 2, pin 3, pin 4, pin 5, pin 7, pin 10, pin 11, and pin 12 to ground of IC1 LM384.
- Connect pin 6 of IC LM384 to center leg of pot VR1.
- Connect pin 8 of IC1 LM384 to ground through capacitor C4 and 8Ω speaker.
- Connect from pin 8 of IC LM384 through ground a resistor R1 and capacitor C3.
- Connect capacitor C1 one leg to positive supply and other leg to ground.
- Connect pot VR1 first leg to audio input, center leg to pin 6 of IC1 LM384, and third leg to ground.
Conclusion:
A flexible integrated circuit the LM384 is meant to be used in the construction of basic and effective audio amplifier circuits.
Its user friendly features which make it suitable for a range of applications, include automated output level control, heat protection and ground referenced inputs.
When working with electrical circuits keep in mind that safety procedures should come first to guarantee a successful and risk free outcome.
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