General LDR Preamp Info
This section includes topics that are general to all Tortuga Audio preamps which all utilize light dependent resistors (LDRs) for volume control.
Topics covered under this section include:
Light Dependent Resistors
LDRs are introduced including what they are, benefits of using LDRs, the technical challenges of designing with LDRs, and how Tortuga Audio preamps are unique in how they incorporate LDR technology.
Attenuation and Impedance
Here we provide an overview of how volume control (attenuation) works and how impedance (resistance) fits into the picture.
After introducing the topic of impedance, here we dive into a truly unique feature of the Tortuga Audio preamp, adjustable input impedance.
The single most unique aspect of Tortuga Audio’s implementation of an LDR based volume control is the built-in self-calibration of replaceable plug-in LDRs thus avoiding the old practice of having to use externally matched LDRs and essentially “bricking” the preamp when an LDR went out of spec or failed.
Here we provide a detailed list of specications that are common to all LDR based Tortuga Audio preamps.