This article will show how to construct a simple 100 watt amplifier circuit using a IC LM12.
No need for complex wiring or multiple components follow a few steps and soon you will be immersed in rich, top notch sound.
The 100 watt amplifier circuit boasts a compact and efficient design making it ideal for diverse settings.
This LM12 integrated circuit is a design that utilizes the IC LM12 to amplify audio signals and deliver a powerful output of 100 watts.
Circuit Working:
Parts List:
| Component | Description | Quantity |
|---|---|---|
| Resistors | ||
| 3.3k | 1/4 watt | 1 |
| 2.2k | 1/4 watt | 1 |
| 1k | 1/4 watt | 2 |
| Capacitors | ||
| Ceramic | 2.7nF | 1 |
| Ceramic | 100nF | 2 |
| Electrolytic | 4700μF 100V | 6 |
| Semiconductors | ||
| Diodes | 6A2 | 2 |
| Diodes | 6A4 | 4 |
| IC | LM12 | 1 |
| Transformer | 24V-0-24V 5 Amp | 1 |
| Inductor | L1 4μF | 1 |
| Speaker | 4Ω | 1 |
The Simple 100 Watt Amplifier Circuit using a single IC is a streamlined and effective design employing the LM12CLK integrated circuit for processing.
The IC features a robust output stage capable of operating at low impedances down to 2 ohms delivering up to 150W of power.
However, for safety and stability the circuit is tailored for use with 4 ohm speakers resulting in an RMS power of 100W.
To power the circuit, the transformer needs to supply 24v + 24V of AC with a minimum current of 5A for mono or 10A for stereo.
A metal rectifier bridge unit, with a heat sink is recommended instead of employing four diodes for the bridge rectifier unit.
The output coil L, is fashioned by winding 14 turns of No.
18 wire with a 1 inch diameter and no core.
The coils turn distance is not critical to performance.
Utilizing a precision resistor of 1k value and an output resistance rated for at least 2W power the circuit achieves optimal performance.
The electrolytic capacitors must be rated at 50V or 63V.
These components collectively contribute to a robust and high quality audio experience.
Elevate your audio setup to the next level with this project featuring a compact efficient circuit delivering potent, top notch sound.
Assemble it effortlessly and savor the remarkable audio output.
Take the next step and construct your own 100 Watt Amplifier Circuit using a single IC.
Formula:
The formula provide below is a particular kind of amplifier circuits voltage gain (Av) is expressed as:
Av = 1 + R3 / R2
where,
- Av: This is an indication of the amplifiers voltage gain.
- It is a dimensionless number that may be computed by dividing the input voltage the voltage applied to the op amps non inverting input by the output voltage, or the voltage across the load.
- An amplifier that enhances the input signal has a voltage gain larger than 1.
- R3: This is an illustration of the feedback resistor that is linked between the op-amps output and the inverting input.
- R2: This is a representation of the gain resistor that is linked to ground and the op amps inverting input.
Recognizing the non inverting op amp formula:
Assuming excellent op amp characteristics, the optimal voltage gain in a non inverting op amp arrangement is:
Av = 1 + R3 / R2
According to the formula, the ratio of the gain resistor R2 to the feedback resistor R3 determines the voltage gain.
A larger voltage gain is correlated with a higher R3 / R2 ratio.
Crucial things to keep in mind:
Particularly, non inverting op amp topologies are covered by this formula.
For inverting and other amplifier setups, there are many formula.
An perfect op amp with infinite gain and infinite input impedance is assumed by the formula.
These variables may have an impact on the actual gain attained in real world circuits.
You may construct the correct voltage gain for your amplifier circuit by choosing the proper values for the resistors R2 and R3.
How to Build:
Building a 100 watt amplifier circuit using the LM12 integrated circuit involves several process:
Safety First:
- Ensure that you are working in a safe environment with proper tools and equipment.
- Double check the specifications of all components and follow safety guidelines.
- Connect the power supply transformer to the circuit.
- For mono, connect a 5A current and for stereo connect a 10A current.
- Use a metal rectifier bridge unit with a heat sink instead of four diodes for the bridge rectifier.
Output Coil (L):
- Wind 14 turns of 18 wire around a 1 inch diameter without a core to create the output coil L.
- The exact turn distance is not critical.
LM12 Integration:
- Connect the LM12 integrated circuit to the circuit board.
- Follow the datasheet or pinout information for proper connections.
- Connect the precision resistor 1k, 2W and electrolytic capacitors 50V or 63V to the appropriate pins of the LM12.
Speaker Connection:
- Connect the 4 ohm speakers to the output stage of the amplifier circuit.
- Double check all connections for accuracy.
- Gradually power up the circuit while monitoring for any signs of issues or unusual behavior.
- Use appropriate testing equipment like an oscilloscope or multimeter to check the output signals and ensure they meet the expected values.
Conclusion:
Building a 100 watt amplifier circuit using the LM12 integrated circuit allows you to create a powerful audio amplifier with relatively simple components.
This circuit is capable of delivering high quality sound and can be an excellent choice for audio enthusiasts looking to enhance their audio setups.
References:
Application Note 446 A 150W IC Op Amp Simplifies Design of Power Circuits