Application notes:

• Voltage Gain of the UcD modules

Hypex UcD modules are sold with the voltage gain pre-set at 20 times (26dB).
This is an arbitrary choice. Topologically the module is an instrumentation amplifier,
so gain can be changed by changing only a single resistor.

•  Dealing with legacy pin 1 problems

A concise explanation of why differential inputs like those on our amps are a much
better alternative than floating grounds (which does not solve any problems, really)

• Amplifier signal input wiring
• UcD and EMI
• UcD and IMD, DIM, Slew Rate

Answer to: “Dear Hypex, Why do your data sheets not state IMD and DIM performance figures?”

• UcD and earth/Insulation
• Thermal Design
• DC Servo | 100V line systems

White papers:

• A true One-Bit Power D/A Converter

We've come a long way since believing it made sense to go straight from digital to the power
stage. Have an inside look at the best power DAC ever built and how complicated it got
before the penny dropped.

• Simple Self-Oscillating Class D Amplifier with Full Output Filter Control.

The original UcD publication.

• Simple, Ultralow Distortion Digital Pulse Width Modulator.

The first description of the ripple cancellation trick that's quietly revolutionizing single phase
PWM in motor control.

• AES master class, the engineer's survival guide.

A slightly ambitious slide show for a 2 hour presentation on everything audio.

• AES Class D master class.

A slide show presenting a good run-down of class D basics.

• All Amplifiers Are Analogue, but Some Are More Analogue Than Others

The definitive explanation why there's no such thing as a "digital amplifier", and why most
"digital" amplifiers are seriously fundamentally flawed.

• Globally Modulated Self-Oscillating Amplifier with Improved Linearity

One of the insights that got Ncore rolling. If you want to know what makes Hypex engineers
crack open a bottle of champagne, see (8).

• The G Word, or How to Get Your Audio off the Ground

Ncore® is the trade name for the first significant step in power amplifier performance in a decade. Building on the stong heritage of UcD, Ncore takes the things UcD does well and does them ten times better. Literally. Following nearly two years of sporadic unofficial demonstrations Hypex is ready to announce this ground-breaking technology to the world. Of course, this being audio, people will not only want to know how well it performs, but how it works. Here’s the story.

• NCore technology whitepaper

Due to the ever blurring line between traditional Audio-Video devices and IT equipment, the IEC
(International Electrotechnical Commission) has moved away from the existing separate standards
for these product groups (IEC60950 for IT, IEC60065 for AV) and towards a single new, harmonised
safety standard to govern both.

• Hypex transition to 62368-1