DIY Class-D 500W Switching Amplifier with TL494

I will be discussing a class-d power amplifier utilizing the TL494 IC for PWM, along with an N-Channel MOSFET transistor as the final amplifier. This circuit is simple to build and cost-effective for practicing power amplifier class-d. It can be powered by a 30V to 100V DC asymmetric power supply with a bias voltage ranging from 8VDC to 12VDC. The amplifier can deliver up to 500Watt of power output, which is quite impressive. For detailed instructions on building this power amplifier, refer to the TL494 Power Amplifier circuit schematic and PCB Layout design available for download in .PDF format.

Design of Class D Amplifier using TL494 Schematic

List of Parts:

R1=1K

R2,R5=47K

R3=10K

R4=470R

R6=8K2

R7=56R

R8=2R2

R9=470R

R10=56R

C1=1uF/16V

C2, C3=1N

C4, C6=10uF/50V

C5=2N2

C7, C9, C10=220uF-1000uF/100V

C8= 100N/400V

C11, C12= 1uF - 4u7F / 400V

Q1= MJE350

Q2, Q3=MJE340

Q4, Q5= IRF540, IRF460, IRF250, IRF 4227 N-Channel Mosfet

U1= TL494, TL494CN

L1= 22uH - 35uH

J1= Audio input

J2= Bias Voltage 8-12V

J3= +V 30- 100V DC

J4= Speaker Output

Share this post