A conventional regulated power supply will remove a portion of the unwanted AC noise (= ripple) voltage, but not all. This AC noise is passed on to the digital and analogue audio stages. Digital stages can suffer from jitter, and the analogue stage has noise added to the signal. Noisy supplies colour sound reproduction and are the weakest link in any audio signal chain. For years many companies have come up with alternative, but expensive, solutions that have added a significant amount to the cost of any finished product.

 Virtual DC: An inexpensive No Noise solution
The Beresford Virtual DC represents a radical departure from both traditional power supplies and low noise designs. It comprises of:

1. A 1st stage mains rectification, regulation, and filtering adapter that is able to operate between 100VAC to 260VAC and is plugged directly into the mains socket.
2. A 2nd stage DC storage tank and reverse voltage protection circuit. This prevents any incoming DC of incorrect polarity shorting out the power supply, or DC voltage from the storage tank flowing back into the external 1st stage. It also acts as a storage space for the DC power from the external mains adapter, and rectifier of any AC noise. Just like a DC battery cell, this DC storage tank is technically incapable of storing AC, and that includes any AC ripple or noise.
3. The DC storage tank then distributes its content to different digital and analogue DC regulator circuits. These isolate further any chances of regulator induced noise being fed back to other parts of the power supply chain. Each digital and analogue regulator is in charge of just one DC level. There are 5 DC levels in the TC-7510.   

 This propriety DC supply and noise cancelling system gives the Beresford Virtual DC power supply industry leading performance, without using expensive custom made components.