"Invisus" is from the Greek, and means invisible. In our context invisibility means elimination of unwanted wideband ac noise on the Invisus DC output. Why is that important? The answer is simple, although the mathematics is not. Noise on the DC supply to an audio stage, digital or analogue, influences the audio. The very last thing we need! In all cases sound signals leave an audio stage at poorer quality than upon entry. Noise is the arch enemy of audio. Invisus cards are a powerful solution in combating noise. They replace nosier low cost commercial regulators.

In a linear or switch mode power supply the unregulated output voltage is typically followed by a voltage regulator. The function of the regulator is to take the widely varying DC and AC noise voltage (ripple) from a power source, converting it to a lower steadier DC voltage.

Digital audio, and the analogue stages which follow them, require DC voltages that are stable and ideally totally noise free. Typical digital stages use +5 or +3.3 volts, whilst analogue stages frequently require both + and - voltages.

A conventional regulator will remove a degree of the unwanted AC noise voltage (ripple), but due to the action that conventional regulators use, the effects of the process cause self induced noise.

This unwanted AC noise on the output of the regulator is passed on to the digital or analogue audio stages it is powering. Digital stages can suffer jitter (amplitude vector) while analogue stages have noise added to the signal. Hence it can be readily appreciated that noisy DC supplies are truly detrimental to high quality audio..

Noisy supplies colour sound reproduction. Dynamics become lost and music sounds flat and unnatural. The sound stage progressively disappears (as noise increases), collapsing back into the loudspeakers. Highs become shrill and over energetic. Low frequencies become muddied, undefined and lacking in natural energy. If critical areas of your system, such as the DAC suffer from power supply injected noise, these are the effects you will hear.

Invisus represents a radical departure from traditional bipolar transistor designs of the shunt, closed loop or bang bang variety. Invisus dispenses with bipolar technology altogether for regulation. Both PPR1 and NPR1 utilise a high speed and ultra low output impedance Field Effect Transistor. This coupled with our propriety self noise cancelling system give Invisus DC regulators outstanding resilience, reliability and performance.

Why is Invisus so different? PPR1 and NPR1 regulators use a noise cancelling system. They work in a closed loop time continuous manner. The closed loop maintains a precise output voltage under dynamic current demand changes that occur in music transients. Time continuous relates to the speed of this closed loop (how fast it reacts to changing current demand and unwanted noise). PPR1 and NPR1 are fast. Very fast. Response speed and an exceptionally low 0.008 ohm output impedance guarantees peak current demands are instantly and effortlessly met. Noise transients are nulled in real time. Real time load and noise cancelling response, coupled with precise voltage regulation are the secrets of the Invisus family.

Invisus models are available in complementary polarities;

The INVISUS Positive Precision Reference 1, model number INVISUS PPR1 or the INVISUS Negative Precision Reference 1, model number INVISUS NPR1

Models are shipped factory set to one of the following output voltages (please state when ordering)