DIY 500w Class D amplifier circuit using TL494 ic. it is a class-d tl494 switching amplifier with high efficiency. You can use it as a car sub amp. The TL494 is a PWM ic will provide a high-quality signal that helps to generate high-quality audio signals.
Introduction
The circuit diagram and free PCB layout will be available here. if you want to make this amplifier board just download the PCB layout pdf file print it on glossy paper and do it yourself.
500W TL494 Class D Amp Circuit Diagram
TL494 amplifier circuit and free PCB layout.
The circuit is a simple and highly efficient amplifier circuit that will provide up to 500 watts of output. The PWM will provide the signals to the comparator and process the audio signals on the output stage.
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Working of class D amplifier
The typical class d amplifier consists of a sawtooth waveform generator circuit. comparator, switching circuit, and a low-pass filter section. The sawtooth waveform generator will produce a high-frequency sawtooth waveform for sampling the input audio signals.
The comparator’s job is to mix the input signals with the sawtooth waveform. The switching circuit is doing its job of providing the current and voltage gain which is essential for the amplifier circuit. Low pass filter this circuit will filter out the unwanted signals from the switching circuit.
Components required
- Tl494 – 1
- IRF 540 MOSFET – 2
- 1000uf 63v capacitor – 2
- 1000 uf 50v capacitor – 1
- Bd 139 transistor – 2
- Bd 140 transistor – 1
- 1N4148 diode – 3
- 1uf capacitor – 1
- 10uf capacitor – 2
- 1n capacitor – 2
- 152 pf capacitor – 1
- 1k resistor – 1
- 47k resistor – 2
- 10k resistor – 1
- 470-ohm resistor – 2
- 2R2 resistor – 1
- 8k2 resistor – 1
- 2n2 capacitor – 1
- 56-ohm resistor – 2
- power supply ( separate power supply for bias )
The download links are given here, you can download the complete file to build your own amplifier.
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