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Class A amplifiers have the worst efficiency. Some hardcore audiophiles swear this is the best topology since it results in the least amount of distortion, due to the fact that the "switches" are always on.

Class D theory has been around for decades. The result is a square wave pulse train that is a digital PWM representation of the analog input signal. The square wave pulse train at the amplifier output is then converted into an analog representation by a low pass filter. The Class D topology is not a silver bullet. It has its own unique problems. The output low pass filter has a poor rolloff typically second order 20dB per decade. This makes EMI a potential nightmare. The cables effectively act as an antenna radiating this as RF energy, potentially causing interference with radio equipment.

It would be interesting to look at the radiated emissions using a Spectrum Analyser. Inherently lower damping factor, than class AB amplifiers. Bus pumping in half-bridge stereo mode IRS Most common at low frequency input signals. This puts energy back into the supply rails. This is a reason why this class D reference design requires a good regulated power supply. In addition more capacitance on the supply rails reduces this effect. Note there is no bus pumping effect when operating the amplifier in mono full-bridged mode.

Low Cost high performance Thanks to International rectifier there are now many Class D amplifier modules based on the IRS available at a very modest cost.

After looking at buying a Class D kitset, I was tempted to purchase a complete kit from www. Their kit and build quality looks top notch. Their kits are supplied with large mains toroid transformers, and rectifier and smoothing board. I am led to believe these designs are based off the International Rectifier IRS reference designs. So how much better can they be than a reference design module? For long runs like an event or a music studio sure but for home use its overkill.

This got me thinking I can build one myself if I can source a suitable power supply, Class D amplifier module and enclosure. It appears this is a direct copy of the IRS reference design. The gain of this module is The bridge switch is set to non-bridge mode.

Only the blue LEDs are present one for each channel. This is configured as a 2 terminal variable resistor. This should be set to ohms. This will give a nominal operational frequency of kHz for the amplifier module.

Check the tightness of the devices on the heatsink. Board changes 1. This is usually too much for most sources, and as a result full power is reached too soon. Solution change the voltage gain of the amplifier. Stock voltage gain is I changed R7 from 3k to 6. This changes the gain to What this means in that the input signal can now handle a full scale signal of 1. The other advantage of this is that it effectively doubles the input impedance to the IRS 6. Make sure that your pre-amplifier has a output impedance of ohms or lower using the factor of 10 rule of thumb.

Power Supply.


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