LDR1 & LDR6 Operating Manual – Rev 1
Tortuga Audio
Page: 2
Digital Control Unit:
The LDRx is an analog device that’s controlled by a
microprocessor based digital control unit (“DCU”). The DCU and related control
circuitry are optically and electrically isolated from the audio signal. The DCU uses
proprietary techniques to ensure that the LDR6 delivers matched and balanced
stereo output. The secondary function of the DCU is to mange communications with
the Encoder on the front panel and the infrared Remote.
Light Dependent Resistors (“LDR’s”):
Unlike most preamplifiers, the LDRx does not
use a conventional analog potentiometer (or stepped attenuator with discrete
resistors) for volume control. Volume is controlled via four (4) analog light
dependent resistors (2 per channel) whose light intensities (and thus resistance
level) are controlled by the DCU.
Power Supply:
The power supply is a high quality, high reliability, high efficiency 90-
264 volt AC input, 12 volt DC (1 Amp) output, regulated switching power unit. It has
built-in overload, short circuit and thermal protection and a built-in EMI filter. It’s
Energy Star and CeC compliant with a level V efficiency rating. As “wallwarts” go,
it’s a decent power supply.
The audio signal is both optically and electrically isolated from the power supply.
The power supply powers the DCU, the infrared remote receiver and also provides a
switched 12 volt trigger output for external components.
Inputs:
The LDR6 can accommodate up to six (6) different selectable stereo line
stage inputs via single ended (unbalanced) RCA connectors on the rear panel. The
