RUBY P1 PHONO AMPLIFIER DESIGN IMPLEMENTATION

DESCRIPTION

The RUBY P1 is a two-channel phono preamplifier module with very accurate RIAA equalization and many features. It is realized with the best semiconductors available and non-inductive, low noise, SMD metal film resistors. The circuit is designed to accept both moving coil (MC) and moving magnet (MM) transducers/cartridges directly in order to eliminate the need for an external MC step-up transformer or amplifier. MC/MM input loading, gain and input capacitance values are easy to select with high resolution DIP switches.

The Module is ideal for the most demanding applications requiring accurate RIAA equalization, very low noise, extremely low distortion and superior sonic performance. The RUBY P-1 module has been custom-built for Wyetech Labs by completely automated state of the art assembly methods using extremely precision components with tolerances to 0.1% accuracy.

Wyetech Labs Dual completely independent power supplies for each channel rendering the most accurate level attainable by any means. [far outperforms battery supply operation]

SHUNT REGULATION in DC power supply

The Niagara river produces enormous power while still allowing some water to flow over the falls to maintain the beauty of it and allow it to be a world attraction. It only consumes a portion of the water flow to meet these dual requirements.

It is the equivalent to Shunt Regulation in audio power supplies and specifically in the Ruby Phono power supply.

The power supply is designed to produce more power than what is actually needed while the surplus power is dissipated as heat in order to maintain a precise voltage to the amplifier itself. The amplifier drains the current [ power ] from the power supply as needed which can vary depending on the signal output, while fixating the VOLTAGE to a precise level to eliminate any modulation of the actual audio voltage signal.

The dual RED / GREEN LEDís show the operation of these four circuits. The LEDís monitor this excess current which flows through each of them such that they become the status of the proper operation. They should always be lit but the intensity of the light output could vary depending on the AC power fed to it. If any should go out they represent a power fault that could be caused by several factors which we can determine by the effect it has on the audio reproduction itself. Notwithstanding in proper operation they should always be lit up.

In other words the amplifying circuit is always supplied with the power it needs which can vary with the signal while the excess power is dissipated through the ground as heat. This type of regulation is called shunt regulation and is considered to be far superior to a series type regulator which is why we chose to implement it in this product.

FEATURES

Compact design. Dual-mono. Very low noise. Single or Balanced output

Non-inductive low noise SMD metal film resistors [0.1%]

Input accepts moving coil/moving magnet (MC/MM) cartridges directly without step-up transformer

Input loading > 10 ? to 47k ? selectable in 21 steps

Gain Select > 40db to 80db selectable in 34 steps

High output drive. Balanced - 28V. Unbalanced - 14V

High accuracy RIAA equalization with 0.05dB tolerance

Selectable time constants of 3.18uS and/or 7950uS

Total harmonic distortion 0.0003%

Low output impedance [ 0.1 Ohm ] - drives long signal cables

Two-stage dual-supply voltage regulator on PCB board for each channel in combination with external DC power supply

Three-stage outboard power supply with 6 chokes and over 40,000 uf of filtering capacitance