Site icon Circuit Ideas for You

15W Class B Audio Amplifier Circuit

Audio amplifier make weak sound strong and is good for speakers.

This 15W Class B Audio Amplifier Circuit give clear, loud sound and is good for home or DIY.

It uses LM833 op-amp with NPN and PNP transistors for strong boost.

Smart design cut distortion, works well and is efficient for many sound needs.

Circuit Working:

Parts List:

ComponentSpecificationQuantity
Resistors10k 1/4 watt1
1M 1/4 watt1
Potentiometer 22k1
CapacitorsCeramic 0.22µF2
Electrolytic 47µF, 25V1
SemiconductorsIC LM8331
TIP41 NPN1
TIP42 PNP1
Diode 1N41481
Speaker1

In this circuit audio input goes through capacitor C3 AC coupling.

C3 send signal to pin 3 which is the non-inverting pin of LM833 IC.

C3 block DC and only let AC audio signal pass.

Resistor R3 1M give ground reference for input signal.

LM833 IC first amplify signal.

Gain depends on feedback parts in circuit.

Output from pin 7 goes to base of NPN transistor Q1 TIP41.

Q1 NPN and Q2 TIP42 PNP work in push-pull pair to boost signal.

This setup reduce crossover distortion in Class B amplifier.

Diode D1 1N4148 help smooth switching between Q1 and Q2.

Capacitor C1 help stability and with filter noise.

Capacitor C2 block DC from going to speaker which is the the load.

Circuit uses dual power supply which is +12V and -12V.

Output signal goes to 8 ohm speaker with max power of 15W.

Formulas with Calculations:

Use these formulas to make simple 15W Class B amplifier:

Power Output (P):

P = (V_peak²) / (2 × R)

where,

Example:

P = (15.5²) / (2 × 8)

P = 240.25 / 16 = 15W

Voltage Gain (A):

A = V_out / V_in

where,

How to Build:

To build a Simple 15W Class B Audio Amplifier Circuit follow the below mentioned connections steps:

Conclusion:

This 15W Class B Audio Amplifier Circuit is easy to make and is good for small audio jobs.

It uses LM833 IC with matching transistors and give good sound with low power use.

If built right then the sound is clear with less distortion.

This circuit is great for hobby and audio lovers.

References:

Datasheet IC LM833

Exit mobile version