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High-Power Class-D Audio Amplifier Kit

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$89.95 (inc GST) $81.77 (exc GST)
Ships in 7 to 10 bus. days

Product Description

Originally described in Silicon Chip Magazine over the November and December 2012 issues - however all instructions are included with this kit. 

This DIY high performance amplifier boasts 250WRMS output into 4 ohms, 150W into 8 ohms and can be bridged with a second kit for 450W into 8 ohms. Not only does it output high-quality sound, it is also rugged and reliable with all sorts of protection built in. Class-D amplifiers are also far more efficient and generate much less heat than linear Class-A, B and AB designs. 

Features include: 

  • High efficiency 
  • High power 
  • Low distortion and noise
  • Bridging option for driving 8-ohm load with two modules
  • Over-current protection 
  • Over-temperature protection • Under-voltage switch-off • Over-voltage switch-off • DC offset protection • Fault indicator • Amplifier running indicator • Optional speaker protection module (see KC-5515)


  • THD+N: <0.01%
  • Power output: up to 150W into 8 ohm and 250W into 4 ohm, depending on power supply
  • Efficiency: Typically 90% at full power for 8 ohm and 83% for 4 ohm
  • Signal-to-noise ratio: 103dB with respect to full power
  • Input sensitivity: 2VRMS (4 ohm), 2.2VRMS (8 ohm)
  • Frequency response: +/- 1dB, 10Hz - 10kHz
  • Power requirements: +/- 40 to 60VDC, 50 to 55V nominal (see KC-5471)

Kit supplied with double sided, soldermasked and screen-printed PCB with SMD IC pre-soldered, heatsink, and electronic components.

• PCB dimensions: 117 x 167mm

Note: The surface-mount IC is pre-soldered to avoid frustration

Also available: KC-5517 +/- 55V Power Supply Kit to suit

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